The Installation Handbook - Howarth Timber

PLASTERBOARD 

The Backing of a World Leader 

Lafarge is the world’s largest producer of construction materials, including gypsum 

products, aggregates and cement. The preservation of natural resources and respect for 

the needs of people and the environment are fundamental to the organisation’s business 

approach and philosophy. 

GB Orderline 

For placing orders, delivery enquiries 

and local stockists etc. 

Tel: 0800 373636 

Fax: 01275 377700 

Email: orderline@lafarge-gypsum.lafarge.com 

Literatureline 

For next day delivery of Lafarge literature. 

Tel: 01275 377582 

Fax: 01275 377402 

Email: literatureline@lafarge-gypsum.lafarge.com 

Ireland Orderline 

For placing orders, delivery enquiries 

and local stockists etc. 

Tel: +353 (0)1 6203114 

Fax: +353 (0)1 6203117 

Email: irelandorders@lafarge.com 

The Technical Training Centre 

For all drywall training needs from basic 

introduction to advanced skills and development. 

Tel: 01275 377581 

Fax: 01275 377402 

Email: training@lafarge-gypsum.lafarge.com 

THE LAFARGE GTEC INSTALLATION HANDBOOK MARCH 2008 

Technical Enquiryline 

Technical advisory service. 

Tel: 01275 377789 

Fax: 01275 377456 

Email: enquiryline@lafarge-gypsum.lafarge.com 

Wasteline 

Gypsum waste management enquiries. 

Tel: 01275 377579 

Fax: 01275 377402 

Email: wasteline@lafarge-gypsum.lafarge.com 

The Installation 

Handbook 

Plasterboard, jointing and associated products made in the 

United Kingdom by Lafarge Plasterboard are manufactured 

in accordance with management systems certified to 

BS EN ISO 9001: 2000 (quality) and BS EN ISO 14001: 

2004 (environment) 

Certificate No. FM 13594 Certificate No. EMS 75024 

LAFARGE PLASTERBOARD LTD 

Marsh Lane, Easton-in-Gordano 

Bristol BS20 0NF 

Tel: 01275 377773 

Fax: 01275 377737 

www.lafargeplasterboard.co.uk 

LAFARGE PLASTERBOARD (IRELAND) LTD 

Unit 38, Fonthill Industrial Park, 

Clondalkin, Dublin 22 

Tel: +353 (0) 1626 1603 

Fax: +353 (0) 1626 1679 


IH/0308/CD

Introduction 

CONTENTS 

GTEC New Commercial Brand 2 

Group Overview and Lafarge Support Services 4 

System solutions... 

for life 

Lafarge GTEC Drywall Systems 

Wall Linings 

GTEC Direct Bond 7 

GTEC Independent Wall Lining 13 

GTEC Dryliner 19 

Partitions 

GTEC Metal Stud 25 

GTEC Acoustic Homespan 33 

GTEC Drywall Timber Stud 41 

Floors and Ceilings 

GTEC Direct To Timber 45 

GTEC Acoustic Floor 49 

GTEC Dryliner Ceilings 55 

GTEC Suspended MF Ceilings 61 

GTEC T-Bar Corridor System 67 

GTEC T-Bar Flat Ceiling System 73 

Finishing 

GTEC Taping and Jointing 79 

GTEC Cove 89 

Product Selector 

GTEC Boards and Compounds 97 

GTEC Fixings 101 

GTEC Ready Reckoner 107 

Our Promise: We provide quality, support and expertise across all our GTEC product ranges 

and promise that our Lafarge GTEC Plasterboard Solutions will perform to the agreed 

lifetime and performance requirements. 

Our Availability: We have a national network of merchants and distributors. 

Our Expertise: We provide technical support at all levels as well as on and off-site training, 

tailored to meet your needs. 

Our Commitment to the Environment: We are dedicated to the preservation of natural 

resources and the environment. 

Always insist on genuine Lafarge products for your total peace of mind. 

LIFETIME SYSTEM 

WARRANTY

Introduction

As of 31 March 2008 Lafarge are very proud to launch GTEC TM Plasterboard 

Solutions – the new commercial brand in the UK and Ireland for our 

plasterboard products and systems. 

What does this mean for our customers 

NEW COMMERCIAL BRAND 

The GTEC commercial brand aims to make it easier for you our customers to understand 

the real value of the Lafarge drywall solution offer and create a simpler product structure. 

It will also help our stockists to better position our products. Providing a clear offer and 

understanding of value in the provision of plasterboard solutions. 

GTEC plasterboard solutions have 4 main commercial product ranges as shown below: 

MASTERBRAND 

COMMERCIAL BRAND 

TM 

COMMERCIAL RANGES 

Standard 

Specialist 

Performance 

EXAMPLE 

GTEC Fire Board 

Studs 

Tracks 

Channels 

Angles 

Accessories 

EXAMPLE 

GTEC C Stud 

Jointing Compounds 

Joint Tapes 

Beads 

Sealers 

Textures 

EXAMPLE 

GTEC Joint Filler 

(previously Fast Set) 

Cove 

Cove Adhesives 

Profiles 

Tools 

Adhesives 

Renders 

Drywall screws 

Nails 

EXAMPLE 

GTEC Universal 

Bonding Compound 

22 THE INSTALLATION HANDBOOK 2008

What are the values of GTEC 

The GTEC brand platform will be the foundation of everything that we deliver to our 

customers. GTEC represents the key values and essence of our business. 

TM 

Sustainable 

Technical 

Expertise 

Innovation 

Customer 

Satisfaction 

The GTEC commercial brand will affect the product names in the following ways: 

For a full product comparison chart which displays all the relevant changes, 

please call Literatureline on 01275 377582. 

THE INSTALLATION HANDBOOK 2008 

33

Lafarge – a world leader 

Lafarge is a world leader in construction materials 

and holds top-ranking positions in its core business 

areas: cement, concrete, aggregates and gypsum. 

INTRODUCTION 

Its success has been built up through innovation 

and experience over 160 years. The Lafarge Group 

is active in 75 countries and employs nearly 

77,000 people. 

Lafarge has developed global technical expertise that 

supports the preservation of natural resources and 

respects the needs of people and the environment. 

The Group is committed to the development of 

materials and the advancement of the construction 

industry by bringing greater safety, comfort and 

aesthetic appeal to everyday living and working. 

First choice in drywall 

Lafarge Plasterboard was founded in 1987. Combined 

with the strength of Lafarge worldwide, it has in-depth 

knowledge of all aspects of the gypsum industry from 

materials extraction to site installation. It also strives to 

continually improve and expand the range of products 

and systems on offer to customers today, whilst 

anticipating tomorrow’s demands. 

Backed by international expertise and resources, 

Lafarge has a continuing commitment to provide 

customers with the innovative design and high 

quality of product they have come to expect. 

TM 


Environmental Policy 

Fulfilling our Responsibility to the Environment and the 

Community is a key objective of our business. 

We will prevent pollution, complying with all relevant 

environmental legislation. Where feasible, we will 

integrate Environmental considerations into our 

business processes, improving sustainability and 

product stewardship. 

All employees are responsible for respecting this 

policy and education and training to this end will be 

provided. The company will adopt an Environmental 

Management System (EMS) complying with BS EN 

ISO 14001: 2004 to ensure its environmental 

objectives are met. We will continuously improve our 

environmental performance. 

• Maximising the efficient use of energy in our 

business; 

• Minimising the use of non-renewable resources and, 

when feasible and safe, replacing them with 

secondary raw materials or alternative fuels; 

• Minimising waste, re-using and recycling materials 

where possible, disposing of waste responsibly; 

• Conserving water and minimising the risk of 

accidental release to air water and land; 

• Respecting the natural environment surrounding our 

sites; limiting noise and progressively improving their 

visual aspect; 

• Minimising the environmental risks to our employees 

and surrounding communities; 

• Encouraging our suppliers to adhere to similar 

environmental principles through procurement 

processes; 

• Adhering to environmental commitments defined by 

Lafarge Group and the Lafarge Gypsum Division. 

Specific targets will be developed to drive many of 

these objectives. Good stakeholder relations will be 

promoted through active engagement and 

communication. Lafarge Plasterboard employees play 

a key role in the implementation and success of this 

policy and targeted communication will encourage and 

support their active participation. 

Lafarge Technical Support 

Technical Enquiryline, Lafarge’s technical advisory 

service, providing a team of building professionals 

dedicated to answering your technical questions on 

all aspects of drywall. 

Whilst our literature covers most common uses and 

situations, every installation is different and there 

are bound to be special situations which are not 

covered. In these cases Technical Enquiryline can 

provide an immediate response to your specific 

enquiry. These enquiries may include installations 

and design detailing, the performance of drywall 

systems covering fire and sound ratings and 

U-value calculations. 

Lafarge Wasteline 

The Lafarge Wasteline service offers our Waste 

management solution. We are committed to work 

with our customers to ensure compliance with 

Legislation and Regulations regarding handling of 

gypsum waste. 

Technical Enquiryline, Technical Advisory Service 

Marsh Lane, Easton-in-Gordano, Bristol, BS20 0NF 

email: enquiryline@lafarge-gypsum.lafarge.com 


Literatureline 

The Lafarge Literatureline provides a quick and 

efficient service for those requiring literature. 

Telephone: 01275 377582 

Fax: 01275 377402 

Email: literatureline@lafarge-gypsum.lafarge.com 

Telephone: 01275 377579 

Fax: 01275 377402 

Email: wasteline@lafarge-gypsum.lafarge.com 


5

Lafarge Customer Services 

A commitment to serving customers is central to 

every part of Lafarge‘s business – from supply of 

raw material to delivery of product and beyond. 

Monitoring through the On Time In Full (OTIF) 

programme maintains the Company’s industrybeating 

levels of service. 

A full supporting infrastructure is in place to ensure 

quality and customer satisfaction. 

Lafarge Customer Services Department process 

orders and delivery enquiries nationwide. They 

provide comprehensive, up to date information 

relating to availability of products, stockists, etc. 

Orders for delivery within Great Britain can 

be placed free of charge by ringing Customer 

Services Department on 0800 373636. 

England, Wales and Scotland 

Lafarge Plasterboard Limited 

Marsh Lane 

Easton-in-Gordano 

Bristol 

BS20 0NF 

Telephone: 0800 373 636 

Fax: 01275 377700 

Email: orderline@lafarge-gypsum.lafarge.com 

Ireland 

INTRODUCTION 

Lafarge Plasterboard (Ireland) Limited 

Unit 38, Fonthill Industrial Park 

Clondalkin 

Dublin 22 

Telephone: +353 (0)1 6261603 

Fax: +353 (0)1 6261679 

Lafarge Technical Training Centre 

The Technical Training Centre offers a choice of 

training packages to enable specifiers, merchants, 

contractors and supervisory staff to keep abreast of 

the latest drywall developments and installation 

techniques. Training can take place at Lafarge’s 

purpose-designed centre, or mobile units can provide 

a unique ‘doorstep service’. If required, courses can 

be tailored to individual company requirements. 

In addition to the systems covered in this guide, 

courses are available on: 

■ Column and Beam Encasements 

■ Shaftwall 

■ Mechanical Taping and Jointing. 

For all drywall training needs, from basic 

introduction to advanced skills and development, a 

course can be tailored to meet your needs. 

Please call for further information. 

The Technical Training Centre 

Marsh Lane 

Easton-in-Gordano 

Bristol 

BS20 0NF 

Telephone: 01275 377581 

Fax: 01275 377402 


The Lafarge GTEC Direct Bond 

System is for bonding plasterboard 

and GTEC Thermal Boards directly 

onto masonry backgrounds. 

Wall Linings: 

GTEC 

Direct Bond

WALL LINING: DIRECT BOND 

(including GTEC Thermal Boards) 

Installation detail on external walls 

400-600mm 

See Use of GTEC 

Universal Bonding 

Compound, Table 2 

Continuous 

band 50mm 

clear of ceiling 

Dabs 230mm 

long at 300mm 

centres 

Continuous 

band 50mm 

clear of floor 

Table 1: Adhesive selection for GTEC Standard Board* 

Background type Typical examples Pre-treatment Adhesive 

High-Suction masonry Aerated or lightweight aggregate PVAC bonding GTEC Universal 

concrete blocks agent Bonding Compound 

High-Suction masonry Aerated or lightweight aggregate None GTEC Universal 

concrete blocks 


Low and Medium- Common clay and concrete blocks, high None GTEC Universal 

Suction masonry density clay and concrete blocks/brickwork, Bonding Compound 

smooth precast concrete 

Very Low-Suction surfaces High strength concrete PVAC bonding GTEC Universal 

agent 


PVAC treated surfaces _ None GTEC Universal 


*Note: GTEC Universal Bonding Compound is suitable for bonding GTEC Thermal Board linings 


Table 2: Use of GTEC Universal Bonding Compound 

Board Board Vertical Number of 

thickness width centres dabs across 

(mm) (mm) (mm) board 

9.5 900 450 3 

9.5 1200 400 4 

12.5 900 450 3 

12.5 1200 600 3 

GTEC Movement Control Joint 

Cavity barriers 

Certain floor/ceiling constructions can allow the circulation 

of air behind the GTEC Thermal Boards and air may also 

enter at junctions with partitions and door/window frames. 

This circulation can reduce the thermal performance of the 

wall. Building Regulations Approved Document L requires 

the application of continuous horizontal or vertical bands 

of GTEC Universal Bonding Compound around the specified 

wall perimeters, junctions and frames of linings to internal 

faces of external walls. 

Movement control joints 

Movement control joints are required in wall linings at intervals 

not exceeding 10 metres and where the drylining crosses or 

abuts a structural movement joint. At movement control joints 

leave a 12.5mm opening between the GTEC Thermal Boards 

and apply a continuous vertical ribbon of GTEC Universal 

Bonding Compound to each side of the joint, about 25mm in 

from the edge of the GTEC Thermal Board. 

Cut GTEC Movement Control Joint to length. Butt joint lengths 

end to end where necessary. Attach to the GTEC Thermal 

Bond surface with 13mm stainless steel staples at 150mm 

centres. Apply GTEC Joint Filler or GTEC Allset in two coats 

feathering out the edges of the second coat. After finishing, 

remove the masking strip from the centre of the joint. 

Thermal Board Linings (Direct Bond) 

25mm 

300mm 

Insert GTEC Nailable Plugs as indicated 

Installation 

For GTEC Thermal Board linings, fix to wall with 2 nailable 

plugs per panel - see diagram for fixing positions. To install 

nailable plugs first drill two 6mm diameter holes through the 

GTEC Thermal Board and GTEC Universal Bonding 

Compound into the masonry background. Ensure each hole 

goes through a dab and penetrates the masonry by at least 

25mm. The maximum component thickness, including 

plaster or render, GTEC Universal Bonding Compound and 

GTEC Thermal Board that can be accommodated by each 

size plug is as follows: 60mm GTEC Nailable Plug - 35mm, 

80mm GTEC Nailable Plug - 55mm, 100mm GTEC 

Nailable Plug - 75mm and 120mm GTEC Nailable Plug - 

95mm. Insert GTEC Nailable Plugs and drive them just 

below the plasterboard surface, ensuring that the 

plasterboard paper liner remains intact. 

Door and window reveals 

Around door and window reveals of masonry construction, 

direct bond the GTEC Thermal Board to the background, 

as for main wall areas. Complete installation with a GTEC 

Nailable Plug at top and bottom of each reveal. 


9

INSTALLATION 

1 

Apply a chalk line to floor and ceiling allowing 

for thickness of plasterboard or Thermal board 

plus a minimum 10mm of GTEC Universal 

Bonding Compound. See Table 1 for correct 

adhesive for the background surface. 

2 

Starting from a window, door reveal or internal 

angle mark wall vertically with chalk for the 

rows of dabs at the required centres, as set 

out in table 2. Allow for dabs at 25mm in from 

board vertical edges. 

3 

Apply continuous perimeter ribbon of GTEC 

Universal Bonding Compound at 50mm below 

ceiling line and 50mm above floor level. 

A continuous perimeter should also be applied 

around any service cut out i.e. light switches. 


4 

Apply vertical dabs at required centres on the 

chalk lines. Dabs should be 50 to 75mm wide, 

about 250mm long at 300mm centres and 

between 10 to 25mm thick. The contact area of 

the dabs must be at least 20% of the board area. 

Note: Apply enough dabs to fix one board only at 

a time. 

5 

Press the plasterboard grey face firmly against 

the dabs, fitting the board tight against the 

ceiling. Temporarily wedge the bottom edge in 

position using offcuts. At corners align as per 

details opposite. Ensure tight butt joints at 

junctions. 

6 

Tamp board into alignment with floor and ceiling 

chalk lines using a straight edge. 

Remove wedges when the compound has dried 

(allow 8 hours). 

For thermal laminates such as GTEC Thermal 

Boards, fix GTEC Nailable Plugs after compound 

has set. 


11

Direct Bond (including 

GTEC Thermal Board) 

Components 

Lafarge 

code 

Size 

Lafarge GTEC Direct Bond system is 

used for attaching plasterboard and 

GTEC Thermal Board directly onto 

masonry backgrounds. This method is 

quick to apply and can be used to 

correct minor irregularities in the 

existing background. 


Bonding Compound* 

BOND25 

25 kg 

Applications 

• Lining new masonry walls for 

domestic use. 

• Lining new masonry walls for 

commercial use. 

• Lining old masonry walls which 

have an even background. 

Benefits 

• Quick and cost effective to install. 

• No mechanical fixing is needed with 

GTEC Standard Board. 

Good Site Practice 

• This system must only be used on 

walls which are free from damp. 

• GTEC Universal Bonding Compound must 

harden before jointing, allow 8 hours. 

• Will only correct minor surface 

irregularities. 

• Not suitable for the installation of GTEC 

Vapour Board, GTEC Moisture Board, 

GTEC Fire MR Board or GTEC Hydrodeco. 

GTEC Nailable Plugs* NP60 60mm 

NP80 80mm 

NP100 100mm 

NP120 120mm 

GTEC Board 

* For use with all GTEC Thermal Board linings. 

Preparation 

various 

Prepare surfaces as required according to table 1 and 

select appropriate adhesive. Cut plasterboard 10mm 

shorter than the floor to ceiling height. 

Notes: 

See GTEC 

Product 

Selector 


Guide for 

details 

1. Extremely smooth surfaces may require abrasion prior 

to PVCA treatment. 

2. Surfaces must be free of mould, oil and dust. 

Contaminated surfaces may require chemical cleaning. 

Painted surfaces are not suitable for direct bonding; use 

Lafarge GTEC Dryliner System. 

3. Maximum build-up with GTEC Universal Bonding 

Compound is 25mm. Use Lafarge GTEC Dryliner System if 

the walls are consistently more than 25mm out of plumb. 


The Lafarge GTEC Wall Lining 

System is designed to be installed 

clear of existing walls. 

Wall Linings: 

GTEC 

Independent 

Wall Lining

WALL LINING: GTEC Independent 

150mm 

GTEC U Track 

Snipped and bent upwards or 

downwards to form door head 

member. Fixed to GTEC C 

Studs with GTEC Self Drilling 

Wafer Head screws 

600mm or 400mm 

GTEC U Track 

GTEC I Stud 

300mm 

GTEC C Stud 

Minimum 

30mm gap 

GTEC U Track 


STUD 

Max. Height Guidance Table (m) 

12.5mm Plasterboard 

1 Layer of 2 Layers of 

Plasterboard Plasterboard 

IS50/RX 2.4 2.7 

IS60/B 3.0 3.9 

IS70/B 3.6 4.5 

IS90/B 4.5 5.4 

Preparation 

Set out the Lafarge GTEC Independent Wall Lining System 

inside the external wall construction; allow a minimum cavity 

width of 10mm between the external wall and the back of the 

metal framing, or to the insulation if the thickness of the 

insulation is greater than the width of the framing. 

Note: ensure that the walls are appropriately treated for any 

dampness. 

Insulation 

Where required, insert mineral wool batts into the framing 

within the flanges of the studs and tracks. Ensure that they 

are fully inserted into the framing, and that the cavity 

between the lining and the external wall is maintained. 

Where batts are thicker than the framing width, fit the batts 

with the exposed face level with the face of the framing. 

The back edges of the batt should be pushed onto the rear 

flanges of the track and I stud components. GTEC Insulation 

Hold Strips can also be used to hold quilts and narrower batts 

in position; fit 150mm from top of lined wall, and thereafter 

at 1200mm vertical centres using GTEC Wafer Head Self 

Drilling screws. The use of GTEC Vapour Board should be 

considered to control condensation. 

Existing Wall 

Plasterboard 

Insulation tucked 

into GTEC I Stud 

Movement Control Joint 


Movement control joints are required in wall linings at 

intervals not exceeding 10 metres and where the drylining 

crosses or abuts a structural movement joint. At movement 

control joints leave a 12.5mm opening between the 

plasterboards and use GTEC I Studs on each side of the joint 

to support the plasterboard edges. 

Cut GTEC Movement Control Joint to length. Butt joint lengths 

end to end where necessary. Attach to board surface with 

13mm stainless steel staples at 150mm centres. Apply GTEC 

Joint Filler or GTEC Allset Extra in two coats, feathering out the 

edges of the second coat. After finish-ing, remove the masking 

strip from the centre of the joint. 

Internal Corners 


15

INSTALLATION 

1 Set out the Lafarge GTEC Independent Wall 

Lining System inside the external wall; allow 

a minimum cavity width of 30mm between 

external wall and the back of the metal framing, 

or to the insulation if thickness of insulation 

is greater than width of framing. 

Fix GTEC U Track to timber or concrete floor 

at 600mm centres using suitable fixings. 

Note: If applying GTEC U Track directly to new 

concrete, the concrete must be dry and a dampproofing 

membrane must be used. On uneven 

floors a timber sole plate may be required. Where 

sound insulation is critical, apply a bead of GTEC 

Intumescent Acoustic Sealant under the sole plate. 

2 

Install a GTEC C Stud using a spirit level 

to plumb upright on end wall, and fix at 

600mm centres using suitable fixings. 

3 

Install ceiling GTEC U Track onto the end wall 

GTEC C Stud, using a GTEC I Stud (as a temporary 

prop) and spirit level. Plumb the opposite end of 

the ceiling GTEC U Track to align with floor GTEC 

U Track. Screw-fix the ceiling GTEC U Track into 

position at 600mm centres or less. 

Now fix the opposite end wall GTEC C Stud 

Note: If sound insulation is required, apply a 6mm 

bead of GTEC Intumescent Acoustic Sealant around the 

perimeter of the framing before applying 

the boards. 


4 

Using a disc cutter, drop-saw or angle grinder, 

cut GTEC I Studs to length (5mm shorter than 

the floor to ceiling height) whilst they are in a 

pack. If ceiling or floor are very uneven, you will 

need to cut GTEC I Studs separately. 

5 Insert the GTEC studs into the floor and ceiling 

tracks and twist to lock. Position them at 600mm 

centres for 1200mm wide, 12.5mm thick 

plasterboard. 

Note 1: Arrange the framing so the board widths of less 

than 300mm are avoided. Use GTEC I Studs for the 

main run of the wall lining, with GTEC C Studs at the stop 

ends, abutments, junctions, openings and corners. 

Note 2: Insulation batts and any services should be 

installed prior to boarding. 

Once the GTEC I Studs are friction-fitted, fix the 

end GTEC C Studs to head and floor GTEC U 

Tracks with GTEC Wafer Head Self Drilling screws, 

or crimping tool. 

6 

Cut the plasterboard 5 to 8mm shorter than the 

floor-to-ceiling height, butt firmly against the 

ceiling and fix to the framing with GTEC Drywall 

Self Drilling screws at 300mm centres. 

Butt board edges lightly against each other and 

centre the edges over the studs. 


17

Lafarge GTEC 

Independent Wall 

Lining System 

Lafarge GTEC Independent Wall Lining 

Systems combine the features of other 

Lafarge GTEC metal systems to give 

high strength and quickly assembled 

drylined solutions. 

Applications 

• Designed to be installed clear of a variety 

of existing backgrounds. 

• Drylining reinforced concrete walls, steel 

framed walls, and renovation work where 

existing walls may form an unsuitable 

substrate for other systems. 

Benefits 

• The systems allow space for services, and 

also for high levels of thermal and acoustic 

insulation. 

• The systems offer a range of I stud widths 

of 50mm, 60mm, 70mm, 90mm to 

accommodate a wide range of height 

requirements and can achieve a maximum 

height without bracing of 5.4m. 

• The systems are suitable for fixing all 

types of plasterboard. 


Components 

GTEC I Stud 

GTEC C Stud 

GTEC U Track 

GTEC 

Insulation 

Strip 

GTEC Self Drilling screws 

*12.5mm boards 

GTEC Wafer Head 

Self Drilling screws 

Lafarge 

code 

IS50/RX 

IS60/B 

IS70/B 

IS90/B 

CS50/RX 

CS60/RX 

CS70/RX 

CS90/RX 

UT52/RX 

UT62/RX 

UT72/RX 

UT92/RX 

INSR 

25DSD10000 

14WHSD500 

Dimensions 

50mm wide 

60mm wide 

70mm wide 

90mm wide 

50mm wide 

60mm wide 

70mm wide 

90mm wide 

52mm wide 

62mm wide 

72mm wide 

92mm wide 

30 metres 

Full range of 

fixing lengths 

available from 

25-67mm 

14mm 

• Walls must be treated for any damp 

before installation. 

• Secure fixing at the head and base track 

into existing background is essential when 

installing this system. 

GTEC Intumescent 

Acoustic 

Sealant 

GTEC Board 

ACOUSTIC 

(INTU) 

ACO38 

(INTU) 

AC060 

(INTU) 

See GTEC 

Product 

Selector 


Guide for 

full details 

0.9 litre 

0.38 litre 

0.6 litre 

(new foil refill) 

various 

*For fixing other board thicknesses call Technical Enquiryline on 

01275 377789 for recommended screw length. 


The Lafarge GTEC Dryliner System 

is designed for cavity widths 

between the wall and the back of 

plasterboard lining ranging from 

25 to 130mm. 

Wall Linings: 

GTEC Dryliner

WALL LINING: GTEC Dryliner 

150mm 

GTEC Dryliner Track RD9 

Snipped and folded to form header 

600mm 

2 

3 

GTEC Dryliner Track 

800mm 

300mm 

GTEC Metal Angle 90 or GTEC Dryliner Track RD9 

GTEC Dryliner Channel 


External corners 

Position the brackets as close as possible to each side 

of the corner. At corner, attach GTEC Metal Angle 90 

MFC2330 vertically to horizontal floor and ceiling 

Dryliner Tracks with GTEC Wafer Head screws. 


Insulation 

Existing Wall 

Insulation - slit locally and slide 

behind channels 

Plasterboard 

Where required, insert mineral wool batts between the GTEC 

Dryliner Channels. To ensure that the batts continue behind 

the GTEC Dryliner Channels as an unbroken lining, slit the 

batts locally and slide across each GTEC SR Bracket. The use 

of GTEC Vapour Board should be considered to control 

condensation. 


GTEC Movement Control 

Joint 

Movement control joints are required in wall linings at 

intervals not exceeding 10m, and where the drylining crosses 

or abuts a structural movement joint. At movement control 

joints leave a 12.5mm opening between the plasterboards 

and use GTEC Dryliner Channels on each side of the joint to 

support the plasterboard edges. 

Cut GTEC Movement Control Joint to length. Butt joint 

lengths end to end where necessary. Attach to the board 

surface with 13mm stainless steel staples at 150mm 

centres. Apply GTEC Joint Filler or GTEC Allset, feathering 

out the edges of the second coat. After finishing, remove 

the masking strip from the centre 

of the joint. 


Where it is not possible to screw-fix one of the GTEC SR 

Bracket legs to the GTEC Dryliner Channel RD1, bend back 

the teeth of the GTEC SR Bracket RD2 so that they engage 

with the corner of the GTEC Dryliner Channel as shown and 

screw fix. 

Construction around doors 

1. At ceiling level, continue ceiling GTEC Dryliner Track 

across the door head. 

At floor level, turn floor GTEC Dryliner Track into reveals and 

butt against the door frame as shown. 

Fix the GTEC Dryliner Track RD9 to inside face of door 

frame with suitable fixings as shown. 


2. To form the external corner of each door opening, cut 

GTEC Dryliner Track 5mm less than floor-to-ceiling height. 

Cut back flange at uppermost end of GTEC Dryliner Track 

and fix to ceiling and floor GTEC Dryliner Tracks with GTEC 

Wafer Head Self Tapping screws. 

3. To form door head member use a section of GTEC Metal 

Angle 90 MFC2330 or GTEC Dryliner Track RD9 snipped 

and folded as shown. Attach to the vertical GTEC Metal 

Angles with GTEC Wafer Head Self Drilling screws. 


Door reveal lining assembly 


21

INSTALLATION 

1 Fix GTEC Dryliner Track RD9 at 600mm centres 

to the floor using suitable fixings. Allow for 

required cavity width 

(25mm to 130mm). 

Note: If applying GTEC Dryliner Track directly 

to new concrete, the concrete must be dry 

and a damp-proof membrane must be used. 

On uneven floors a timber sole plate may be 

required. 

Note: Ensure that the 

large flange of both GTEC 

Dryliner Tracks is on the 

plasterboard side. 

2 

Fix GTEC Dryliner Track to ceiling with a suitable 

fixing, ensuring GTEC Dryliner Track at ceiling is 

plumb with that on the floor. 

For 12.5mm plasterboard mark vertical lines at 

600mm horizontal centres on the wall to locate 

GTEC Dryliner Channels RD1. For other board 

thicknesses or for thermalcheck boards contact 

Enquiryline. Mark lines 50mm from external 

corners. At internal corners allow for width of 

abutting wall lining and framing. 

3 

Starting at centre of wall height, position GTEC 

Dryliner SR Brackets RD2 directly to wall at 

maximum 800mm vertical centres on the 

marked lines. Secure each bracket to wall 

with a suitable fixing through the horizontal slot. 

Fold out the toothed wings of each bracket to 

form legs. 


4 

Cut each GTEC Dryliner Channel RD1 5mm 

shorter than the floor to ceiling height. Locate 

the GTEC Dryliner Channel RD1 into GTEC 

Dryliner Track at floor and ceiling. 

Where wall height exceeds 

channel length, connect 

two lengths of channel 

together with GTEC Dryliner 

Channel Connector RD3. 

5 

Ensure the channel is plumb, and secure to 

each bracket leg using GTEC Pan Head Self 

Tapping screws. Where necessary bend back 

the legs of the bracket so they do not protrude 

past the face of the channel. 

6 

Cut the plasterboard 5mm shorter than the 

floor-to-ceiling height, butt the board firmly 

against ceiling and fix the plasterboards to 

the framing with GTEC Self Tapping screws 

at 300mm centres. 

Butt the plasterboard edges lightly against 

each other and centre the edges over the 

channels. Where the height of the lining is 

greater than the plasterboard length, use 

GTEC Fixing Channel to support the horizontal 

cut edges of the plasterboards. 


23

Lafarge GTEC: 

Dryliner System 

Components 

Lafarge 

code 

Dimensions 

The Lafarge GTEC Dryliner System is 

suitable for drylining both new and 

existing uneven masonry backgrounds 

and for the concealment of services. 

It is simple, quick, cost effective and 

completely dry. Suitable for internal 

use in all commercial and domestic 

applications. 

GTEC Dryliner 

Channel 

GTEC Dryliner SR & 

XR Bracket 

RD1 

RD2 

RD11 

2400mm 

3000mm 

25-60mm 

25-130mm 

Applications 

• For cavity width between wall and back 

of plasterboard lining ranging from 25 

to 130mm. 

• Lining masonry walls which have surface 

fixed services. 

• Lining walls which are uneven. 

GTEC Dryliner SR & 

XR Bracket* 

GTEC Dryliner 

Track 

RD3 

RD9 

100mm 

3000mm 

Benefits 

• A completely dry system using secure 

mechanical fixings. 

• Surface-mounted services can easily 

be accommodated. 

• Mineral wool can be incorporated 

within the cavity for thermal or 

acoustic insulation. 

• Suitable for fixing all types of 

plasterboard. 


• Walls must be treated for any damp 

before installation. 

• Secure fixing into existing background 

is essential when installing this system. 

GTEC Metal 

Angle 

GTEC Pan Head Self 

Tapping screws 

GTEC Self Tapping 

screws** 

GTEC Wafer Head 

Self Tapping 

screws 

GTEC Board 

MFC2330 

11PHST500 

various** 

14WHST500 

See GTEC 

Product 

Selector 


Guide for 

details. 

3600mm 

11mm 

ranging 

from 

25 to 86mm 

14mm 

various 

*Use to connect channels together when wall lining height is 

greater than the channel length. 

**See GTEC Fixings Selector Installation Guide for details. 


The Lafarge GTEC Metal Stud 

System is an economical system 

for compact, non-loadbearing 

lightweight fire and sound 

resisting partitions of heights 

up to 12.0m. 

Partitions: 

GTEC 

Metal Stud

PARTITIONS: GTEC Metal Stud 

Junction with masonry wall 

Door header detail 

Snipped and folded to 

form header 

Rubber grommets 

Note: electrical wires should 

be protected where passing 

through framework 

150mm 

GTEC U Track 

GTEC C Stud 

Door lining 

detail 

Timber subframe 

shown here face 

fixed, alternative is 

to infill timber into 

the metal stud. 

Electrical boxes 

Drylining electrical boxes are 

available which allow easy 

installation without the need 

for timber noggings. 


Table 1: Components for Metal Stud Partitions 

Insulation 

If insulation is specified, use GTEC Insulation Hold strips, 

screw-fixed or crimped to the studs 150mm from the 

partition head and at 1200mm vertical centres down the 

partition. 


30 minute fire rated 

two layers 15mm 


60 minute fire rated 

two layers 15mm 


rock mineral wool 

density 60 kg/m 2 

GTEC C Stud 

Plasterboard as specified 

GTEC C Stud 


GTEC C Stud 

15mm GTEC Fire 

Board 


Movement control joints may be required to relieve normal 

structural movement without loading the partition. Movement 

control joints are required in partitions at intervals not 

exceeding 10m, where the partition crosses or abuts a 

structural movement joint, and where partitions of dissimilar 

materials meet in the same plane. 

At movement joints, leave a 12.5mm gap in the GTEC U 

Tracks at head and base. Fix a GTEC C Stud on one side, 

10mm from the gap, and line the web with two layers of 

15mm GTEC Fire Board. Place another stud, web facing web 

on the opposite side of the gap, as shown. Board the 

partition, leaving a continuous 12.5mm gap between boards 

along the line of the movement joint. 

Cut GTEC Movement Control Joint to length; butt joint lengths 

end to end where necessary. Attach to the plasterboard 

surface with 13mm stainless steel staples at 150mm centres. 

Apply GTEC Joint Filler or GTEC Allset Xtra in two coats, 

feathering out the edges of the second coat. After finishing, 

remove the masking strip from the centre of the joint. 

Component Width Length Lafarge 

(mm) (mm) code 

GTEC C Stud 50 2400, 2700, 3000, 3600 CS50/RX 

Red gauge 0.52mm 60 2400, 2700, 3000, 3600, 4200 CS60/RX 

70 2400, 2700, 3000, 3300 CS70/RX 

3600, 4200, 4800 

90 2700, 3000, 3600, 4000, 4200 CS90/RX 

146 2400, 2700, 3000 CS146/RX 

3600, 4200, 4800 

GTEC C Stud 70 3600, 4200 CS70/B 

Blue gauge 0.7mm 90 3600, 4200 CS90/B 

146 3600, 4200, 4800, 5400, 6000 CS146/B 

GTEC C Stud 90 4800, 6000, 7200 CS90/W 

White gauge 0.9mm 

GTEC C Stud 70 4800 CS70/Y 

Yellow gauge 1.2mm 90 3600, 4800, 6000 CS90/Y 

146 6000 CS146/Y 

GTEC U Track 52 3000 UT52/RX 

Red gauge 0.52mm 62 3000 UT62/RX 

72 3000 UT72/RX 

92 3000 UT92/RX 

148 3000 UT148/RX 

GTEC U Track Deep 52 3000 UDT52/B 

Flange Blue gauge 62 3000 UDT62/B 

0.7mm 72 3000 UDT72/B 

92 3000 UDT92/B 

148 3000 UDT148/B 

GTEC U Track Extra 72* 3000 UXT72/B 

Deep Flange 92** 3000 UXT92/W 

*Blue gauge 0.7mm 148** 3000 UXT148/W 

**White gauge 0.9mm 

GTEC Fixing Channel 99 2400 MFIX 

White gauge 0.9mm 

GTEC Metal Angle 23 x 30 3600 MFC2330 

25 x 25 3600 MFC2525 

25 x 50 3600 MFC2550 

GTEC Splayed Corner 50 x 50 3600 MFC135 

Support Angle 

GTEC Flat Strap 50 2400 FS50/RX 

90 2400 FS90/W 

Electrical services 

The installation of electrical services should be carried out in 

accordance with the recommendations of the Institution of 

Electrical Engineers. The knock-outs in the studs can be 

used for routing electrical and other small services. Cables 

should be protected by conduit or other suitable precautions 

taken to prevent abrasion when they pass through the 

metal frame. 


27

INSTALLATION 

1 

From a fixed point mark out the line of partition. 

Fix GTEC U Track to timber or concrete floor 

along the setting out line of the partition at 

600mm centres using suitable fixings. 

If applying the GTEC U Tracks direct to new 

concrete which has not completely dried out, 

a damp proofing membrane should be used. 

Note: A timber sole plate maybe required on 

uneven floors or when installed prior to screed 

being laid. 

2 

Cut the GTEC U Track (and GTEC C Studs) to 

length as necessary using tin snips. 

GTEC C Studs to be cut 5mm shorter than floor 

to ceiling height. 

3 

Install a GTEC C Stud, using a spirit level to 

plumb on end wall; screw fix at 600mm centres 

using suitable fixings. 

Note: Fix opposite end wall GTEC C Stud only 

after ceiling GTEC U Track has been installed. 


4 

Place the ceiling GTEC U Track onto end wall 

GTEC C Stud. Using a GTEC C Stud and spirit 

level, plumb opposite end of the ceiling GTEC U 

Track with the floor GTEC U Track and screw-fix 

into position at 600mm centres. 

Fix the remaining end wall GTEC C Stud. 

5 

Mark the floor and ceiling at centres as specified 

below for the location of intermediate GTEC C 

Studs: 

At max. 400mm centres for 9.5mm plasterboard 

or 600mm centres for 12.5 mm plasterboard. 

Arrange the framing so that plasterboard widths 

of less than 300mm are avoided. 

See step 9 for installation of intermediate studs. 

6 

Use extra GTEC C Studs at openings, corners, 

T junctions and stop ends as shown in the 

details. These extra studs must be fixed to head 

and floor GTEC U Tracks with GTEC Wafer Head 

Self Tapping screws or crimping tool. 

Note: The door frame background metal 

construction details shown above, form one 

of three possible alternatives. 


29

INSTALLATION 

7 

Form the door header by using a piece of 

GTEC U Track. The length should be equal to 

the width of the door frame plus a minimum of 

300mm in order to allow 150mm at each end 

to be cut and folded down. 

8 

Secure header onto GTEC C Studs using a 

crimping tool or GTEC Wafer Head Self 

Tapping screws. 

This detail applies to all door frame assembly 

alternatives. See step 5. 

9 

Install all intermediate GTEC C Studs. 

Cut the GTEC C Studs 5mm shorter than 

the floor to ceiling height to allow for floor 

variations. Insert the GTEC C Studs into 

the GTEC U Tracks and twist to lock. 

The intermediate GTEC C Studs should all 

face the same way. They should not be fixed 

to GTEC U Tracks in order to allow for 

adjustment when fixing plasterboards. 


10 

Form as required, one of the following alternative 

timber background constructions for fixing door 

frames: 

(a) Fix a 38mm x 38mm timber insert into back 

of door frame GTEC C Studs and header. Secure 

using GTEC High Thread screws through face of 

the GTEC C Stud into the timber. 

(b) Fix a timber subframe to the face of the door 

frame GTEC C Studs and header using GTEC Self 


11 Install door frame into position and secure by 

screwing through the door frame into one of 

the alternative background constructions above 

using GTEC Self Tapping screws. Ensure that 

the screws penetrate each of the components 

forming the background constructions. 

To retain sound integrity, apply a 

6mm continuous bead of GTEC 

Intumescent Acoustic Sealant around 

perimeter of the metal framing, 

before applying the wall boarding. 

12 

Install plasterboard to one side of the partition. 

Cut the plasterboard 5mm to 8mm shorter than 

the floor-to-ceiling height, butt firmly against the 

ceiling and fix with GTEC Self-Tapping screws at 

300mm centres. 

Note: Use GTEC Self Drilling screws for GTEC 

Universal Board partitions. 


31

Lafarge GTEC 

Metal Stud 

Partitioning System 

Lafarge Metal Stud Partitioning System 

is an economical friction-fit system to 

assemble frames for strong, compact, 

lightweight non-loadbearing partitions. 

Components 

GTEC C Stud 

GTEC U Track 

Lafarge 

code 

See Table 1 

See Table 1 

Dimensions 

Applications 

• Partitioning for domestic and 

commercial use. 

• For heights up to 12m. 

• Wide range of partition thickness. 

Benefits 

• Quick to erect, lightweight and clean. 

• Metal Stud is dimensionally accurate and 

will not twist or bow. 

• Range of track and stud widths - 50mm, 

60mm, 70mm, 90mm and 146mm to 

meet different performance requirements. 

• Services are easy to install. 

• Mineral wool can easily be installed to 

uprate sound insulation. 


• GTEC U Tracks and GTEC C Studs are 

cold rolled galvanised steel and may be 

stored outside under cover for short 

periods without deterioration. 

• Electrical cables which pass through floor 

or ceiling tracks should be protected by 

grommets. 

• An electrical or battery operated drywall 

screw gun is recommended for speed 

and accurate installation. 

• Ensure service fold downs are aligned 

when installing studs. 

• Gloves are recommended when handling 

metal sections to avoid the risk of cuts. 

GTEC Fixing Channel 

GTEC Flat Strap 

GTEC Insulation 

Hold 

GTEC Self Tapping screws* 

GTEC Wafer Head Self 

Tapping screws* 


Acoustic 

Sealant 

GTEC Board 

FS50/RX 

FS90/W 

INSR 

various** 

14WHST500 

ACOUSTIC 

(INTU) 

ACO38 

(INTU) 

AC060 

(INTU) 

See GTEC 

Product 

Selector 


Guide for 

details. 

See Table 1 

*See GTEC Fixings Selector Installation Guide for details. 

2400mm 

length x 

50mm or 

90mm wide 

30m roll 

ranging 

from 

22 to 

86mm 

14mm 

0.9 litre 

0.38 litre 

0.6 litre 


various 


The Lafarge GTEC Acoustic 

Homespan System is a lightweight, 

non-loadbearing metal stud partition 

system primarily intended for 

domestic applications. 

Partitions: 

GTEC Acoustic 

Homespan

The Lafarge GTEC Acoustic Homespan System is constructed 

with GTEC Acoustic Homespan C Studs. GTEC Acoustic 

Homespan Starter Studs are used at all corners, T junctions, 

stop ends and door openings. 

PARTITIONS: GTEC Acoustic Homespan 

GTEC 

Studs at 

450mm 

centres 

150mm 


Skirting Detail A 

GTEC U Track onto timber 

sole plate. 

Apply GTEC 

Intumescent 

Acoustic Sealer 

Skirting Detail B 

GTEC Deep Flange U Track 

(Skirting is screw fixed to GTEC U 

Track, no blocks necessary). 

Apply GTEC 

Intumescent 


Skirting Detail C 

GTEC U Track including 

skirting block. 

Apply GTEC 

Intumescent 


All three skirting details can be used on Lafarge GTEC Acoustic Homespan Systems. 


35

INSTALLATION 

1 

Mark out the line of the partition. Fix GTEC 

U Track (UT45/RX or UT52/RX) to timber 

or concrete floor along the setting out line at 

600mm centres, using suitable fixings. 

When installing the GTEC U Tracks directly 

onto new concrete which has not completely 

dried out, a damp proofing membrane should 

be used. On uneven floors a timber sole plate 

may be required. 

2 

Cut the GTEC U Track (and GTEC Acoustic 

Homespan Studs) to length as necessary using 

tin snips. Studs should be cut 5mm shorter 

than the floor to ceiling height. 

3 

Using a spirit level to ensure it is plumb, fix a 

GTEC Starter Stud to the end wall, with suitable 

fixings at 600mm centres. 


4 

Place the ceiling GTEC U Track on top of the 

end wall Stud. Then, using a GTEC Acoustic 

Homespan Stud and spirit level, ensure the 

opposite end of the ceiling GTEC U Track is 

plumb with the floor GTEC U Track and screwfix 

it into position at 600mm centres. 

5 

Install all intermediate GTEC Acoustic Homespan 

Studs. 

Cut the GTEC Studs 5mm shorter than the floor 

to ceiling height to allow for floor variations. 

Insert the GTEC Studs into the GTEC U 

Tracks at 450mm centres and twist to lock. 

The intermediate Studs should all face the 

same way. To allow adjustment when fixing 

plasterboards, Studs should not be screw 

fixed to the GTEC U Tracks. 

6 

Use GTEC Starter Studs CS44/RX at door 

openings, corners, T junctions and stop ends 

as shown in details. These extra studs must be 

fixed to ceiling and floor GTEC U Tracks with 

GTEC Wafer Head Self Tapping screws or using 

a crimping tool. 


37

INSTALLATION 

7 

Form the door header by using a piece of 

GTEC U Track. Cut the track so that it is equal 

to the width of the door frame plus a 

minimum 300mm, in order to allow 150mm at 

each end to be cut and folded down. 

8 

Secure the header to the GTEC Starter Studs 

using a crimping tool or GTEC Wafer Head Self 


9 

Form a timber background construction to 

create a secure fixing for the door frame by 

placing a suitably sized timber insert into the 

back of door frame Studs and header Track. 

Secure these timbers using GTEC High Thread 

screws through the face of the Studs into the 

timber. 

Alternatively fix a timber sub frame to the face 

of the doorframe (GTEC C Studs) and header 

using GTEC Self Tapping screws. 


10 

Fix the GTEC Acoustic Homespan board to one 

side of the partition. Cut the board 5mm to 8mm 

shorter than the floor to ceiling height, butt firmly 

against the ceiling and fix with 25mm GTEC 

Self-Tapping screws at 300mm centres. 

11 

When one side is complete, repeat for the 

other side of the partition, ensuring that the 

joints are staggered by 450mm. 

12 

To maximise the acoustic performance use 

GTEC Intumescent Acoustic Sealant and 

seal the floor track. Please refer to diagram 

for details. 


39

Lafarge GTEC 

Acoustic 

Homespan System 

Acoustic Homespan is a lightweight, 

non-loadbearing metal stud partition 

system primarily intended for domestic 

applications. The system is designed to 

take one layer of 15mm x 900 mm wide 

Acoustic Homespan Board fixed to each 

side. It combines purpose-designed sound 

absorbing boards with technically 

advanced metal GTEC C Studs to provide 

at least 40 R W dB sound performance 

without the requirement for insulation. 

The boards and studs used have the added 

benefit of creating a stronger partition 

than conventional GTEC C Stud partitions 

and meet heavy duty strength grading 

classifications when tested in accordance 

with BS 5234 Part 2 1990. The system 

also provides 30 minutes fire resistance 

when tested to BS EN 1364 Part 1 1990. 

Whilst readily meeting the requirements 

of Building Regulation Part E, Acoustic 

Homespan can also be used to match 

still more demanding specifications. 

The introduction of a 25mm 19 kg/m 3 

mineral wool insulation increases 

performance to 43 R W dB. 

Applications 

• Primarily intended for domestic applications 

• Lightweight, non-loadbearing 

Benefits 

• Achieves 40 R W dB sound rating 

without insulation 

• Cost-effective compared with timber stud 

• Eliminates nail popping and cracking 

Components 

GTEC Acoustic 

Homespan 

C Stud 

GTEC Acoustic 

Homespan 

Starter 

Stud 

GTEC U Track 

GTEC Deep 

Flange 

U Track 


screws* 


Acoustic Sealant 

GTEC 

Acoustic 

Homespan 

Board 

GTEC 

Acoustic 

Homespan 

MR Board 

Lafarge 

code 

AHS44/RX 

AHS50/RX 

CS44/RX 

UT45/RX 

UT52/RX 

UDT52/B 

25DST1000 

Acoustic 

(INTU) 

ACO 38 

(INTU) 

AC060 

(INTU) 

F1800H 

F2400H 

F2700H 

*See Fixings Selector Installation Guide for details. 

Dimensions 

44mm wide 

50mm wide 

44mm wide 

45mm wide 

52mm wide 

52mm wide 

25mm 

0.9 litre 

0.38 litre 

0.6 litre 


15 x 900 x 1800 

15 x 900 x 2400 

15 x 900 x 2700 

F2400HM 15 x 900 x 2400 


For fixing GTEC plasterboard to 

timber stud partitions frequently 

used in timber-frame houses, 

small restoration projects and 

home extensions. 

Partitions: 

GTEC Drywall 

Timber Stud

INSTALLATION 

1. Install timber sole plate and framing members to end 

walls and ceiling. Ensure all framing is straight, plumb 

and true, and will provide a firm support for the 

plasterboards. 

2.Fix intermediate vertical studs to the timber floor and 

ceiling plates at maximum 400mm centres for 9.5mm 

plasterboard, and at 600mm centres for 12.5mm and 

15mm plasterboard. Framing should be arranged so as 

to avoid plasterboard widths of less than 300mm. 

Plasterboard edges must be supported at all openings, 

junctions and corners. All framing should provide a 

minimum bearing width for the plasterboard of not less 

than 38mm. 

Note: For all 900mm wide plasterboards, stud centres 

should be at 450mm. 

3. Cut plasterboard 5mm to 8mm shorter than the floorto-ceiling 

height, butt firmly against the ceiling and fix 

with GTEC Drywall Nails at 150mm centres or GTEC High 

Thread screws at 300mm centres. Butt plasterboards 

lightly against each other, centring joints over the studs. 

With double layer boarding, the vertical joints should be 

staggered between layers. 

Sound insulation and High Performance Partitions 

If you require sound insulation or high performance 

party walls, greater performance can be achieved using 

Lafarge's range of performance plasterboard systems. 

Please contact the Technical Enquiryline 

on: 01275 377789 for advice 




around perimeter 

(if required) 

In the case of single layer 

boarding, joints on 

opposite faces offset, all 

joints taped and filled 

timber studs 

cross noggin at 

mid height 

300mm at end of 

partition 

studs at 400mm, 450mm 

or 600mm centres 

timber sole plate 


43

GTEC Drywall Timber 

Stud Partition 

Timber Stud partitions are typically for 

domestic use either loadbearing or nonloadbearing. 

The selection of stud size, and the type, 

number and thickness of board layers will 

depend upon the partition height and the 

performance required for fire resistance 

and sound insulation. For details, refer to 

the Lafarge Drywall Manual. 

Components 

GTEC High Thread 

screws 

GTEC Nails 

Lafarge 

code 

32DHT1000 

38DHT1000 

41DHT1000 

51DHT500 

63DHT500 

76DHT250 

86DHT200 

96DHT200 

NAIL30ZINC 

NAIL40ZINC 

Dimensions 

32-96mm 

30mm 

40mm 

Applications 

• Typically for domestic use. 

• Can provide fire resistance and sound 

insulation where required. 

Benefits 

• When taped and jointed it provides a 

smooth finish for direct decoration. 

• Forms a ready base for gypsum 

plaster or textured finishes. 



GTEC Board 

Recommended screw lengths 

ACOUSTIC 

(INTU) 

ACO38 

(INTU) 

AC060 

(INTU) 

See GTEC 

Product 

Selector 


Guide for 

details 

0.9 litre 

0.38 litre 

0.6 litre 


various 

Construction Plasterboard Screw length 

thickness (mm) (mm) 

Timber framing 6 32 

Single layer 12.5 38 

15.0 38 

19.0 41 

Timber framing 6 + 6 38 

Double layer 12.5 + 12.5 51 

12.5 + 19.0 63 

15.0 + 15.0 63 

Recommended nail lengths 

Construction Plasterboard Nail length 


Timber framing 12.5 40 


19.0 50 

Timber framing 12.5 + 12.5 50 

Double layer 12.5 + 19.0 65 

15.0 + 15.0 65 


The Lafarge GTEC Direct to Timber 

System is designed for fixing 

plasterboard to the underside of 

timber floor joists and roof trusses. 

Ceilings: 

GTEC Direct 

to Timber

CEILINGS: GTEC Direct to Timber 

Standard Installation 

1. Fix noggings around the ceiling perimeter and, if required, 

to support any board edges not already supported by joists. 

Joists and noggings must have a bearing face width of at 

least 44mm. A bearing face width of 38mm is permissible 

in the case of trussed rafters manufactured to BS 5268 : 

Part 3 : 1985. 

When using GTEC boards, provide noggings to support all 

board edges. For two-layer boarding, position the noggings to 

suit the second (outer) layer. 

2. Offer up plasterboards with their paper bound (long) 

edges at right angles to the joists. Butt board edges lightly 

against each other with maximum allowable gap of 3mm. 

(A 3mm gap is always required with GTEC Lath to allow for 

keying of the plaster, and with GTEC Standard Board using 

a textured finish). Working from the centre of each board, 

fix with screws at 230mm centres, and 150mm centres at 

perimeter and the cut ends of board. Fixings should be no 

closer than 10mm to the bound edges and 13mm to the 

cut edges of the boards. The fixings should also be at least 

6mm in from edges of timber framing. Stagger joints 

between cut (short) edges and centre over joists or 

noggings. With two-layer boarding, stagger joints 

and fixings between layers. 

Plasterboard Selection and Finishing 

For direct decoration, textured finishing or skim coat 

plastering, apply plasterboard with the decorating face 

exposed. 

Use tapered edge plasterboard for a flush finish (direct 

decoration) and square edge plasterboard for a textured 

finish and skim coat plaster. Where there may be risk of 

interstitial condensation, use GTEC Vapour Board as the 

inner layer of the ceiling, with the metallised film facing the 

joists. In ceilings incorporating GTEC Fire Board, it must 

always be used as the outer. 

Screw lengths required when fixing plasterboard to 

GTEC Resilient Bar Deep using GTEC Self Tapping 

screws. 

Plasterboard thickness (mm) 

12.5 25 

15.0 25 

19.0 32 

12.5 + 12.5 38 

19.0 + 12.5 44 

15.0 + 15.0 41 

Screw length (mm) 

GTEC Resilient Bar Deep Installation 

1A. When GTEC Resilient Bar Deep is required to achieve 

added acoustic performance, fix the bars at right angles 

to the joists at 450mm maximum centres, 400mm for 

2400mm plasterboard, through pre-punched holes in the 

flange using 32mm GTEC High Thread screws. Set out the 

GTEC Resilient Bars as close as possible to the room 

perimeter. To ensure maximum sound insulation is 

maintained, do not let the GTEC Resilient Bars touch the 

perimeter wall. Joint the bars by overlapping directly over 

joists, with a minimum 200mm overlap. 

GTEC Self 


GTEC High Thread screws 

Joist 

2A. When GTEC Resilient Bars are used, fix plasterboards 

with long edges at right angles to Resilient Bars using 

GTEC Self Tapping screws. See table opposite for length of 

screws. For two layer boarding layouts, stagger the outer 

layer and fix short edges of boards to GTEC Resilient Bars. 

To ensure maximum sound insulation performance, screws 

must not be in contact with the joists. For board jointing 

and finishing details see Finishes section or call the Lafarge 

Technical Enquiryline. 

Plasterboard 

GTEC Resilient Bar Deep at 

right angles to the joist 

Resilient Bar Deep Fixing 


Single-layer Boarding 

Noggins 

Note: With two-layer boarding, 

stagger joints and fixings 

between layers. 

Noggins 

Two-layer Boarding 

Maximum joist spacings 

Thickness Board type Joist centres maximum (mm) 

(mm) with without 

noggings noggings 

12.5 GTEC Standard board, GTEC Lath, GTEC Baseboard, 

GTEC Fire Board*, GTEC Vapour Board*, GTEC Moisture Board. 600 450 

15 GTEC Standard Board 600 450 

GTEC Fire Board* 600 450 

19 GTEC Plank 800 600 

*When using GTEC Vapour Board and GTEC Fire Board noggings may be required to comply with the degree of vapour 

control and fire resistance required. 


47

Lafarge GTEC: 

Direct to Timber 

System 

Direct to Timber is the method for 

attaching plasterboard to the underside 

of timber floor joists and roof trusses. 

Applications 

• Lining new ceilings, typically for 

domestic use. 

• Lining existing ceilings. 

• Provides fire resistance and sound 

insulation where required. 

Benefits 

• Quick and simple to install. 

• When taped and jointed it provides a 

smooth finish for direct decoration. 

• Forms a ready base for gypsum 

plaster or textured finishes. 

Components 

GTEC Resilient 

Bar Deep 


screws** 


screws* 

GTEC Drywall Nails 

GTEC Board 

Lafarge 

code 

RBD3000 

various 

various 

NAIL30ZINC 

NAIL40ZINC 

See GTEC 

Product 

Selection 


Guide for 

details 

Dimensions 

3000 

length 

17mm deep 

ranging 

from 

25 to 

86mm 

ranging 

from 

32 to 

96mm 

30mm 

40mm 

various 

*See GTEC Fixings Installation Guide for details. 

**For fixing to Resilient Bar 

Notes: 

For fixing GTEC Thermal Boards please contact the Drywall 

enquiryline. 

Screw lengths required when fixing plasterboard 

using GTEC High Thread screws into timber frame 

Construction Plasterboard Screw length 


Timber framing 6 32 


12.5 38 

15.0 38 

19.0 41 

Timber framing 6 + 6 38 

Double layer 9.5 + 9.5 41 

12.5 + 12.5 51 

12.5 + 19.0 63 

15.0 + 15.0 63 


The Lafarge GTEC Acoustic Floor 

System is a free-floating, sound 

insulating floor system for 

structural joist framing. 

Ceilings: 

GTEC 

Acoustic Floor

CEILINGS: GTEC Acoustic Floor 

GTEC Resilient Tape 

19mm GTEC Plank 

2 layers of 

GTEC Fire 

Board 

Mineral 

Wool Insulation 

GTEC Floor Clip 

GTEC Metal Angle 

GTEC Resilient Bar Deep 

Table 1: Plasterboards used with system 

Board type Thickness (mm) Width (mm) 

GTEC dB Board 15.0 1200 

(tapered edge) 

GTEC Fire Board 15.0 1200 

(tapered edge) 

GTEC Plank 19.0 600 

Table 2: Recommended 

screw lengths 

Plasterboard Inner Outer 

layers (mm) layer layer 

(mm) 

(mm) 

15.0 + 15.0 25 41 



GTEC Acoustic 

Floor Clip 

GTEC Resilient Bar Deep 

GTEC Resilient tape 

GTEC Plank 

Fitting Ceiling Elements 

1. Screw-fix GTEC Resilient Bar Deep through the flange at 

right angles to the timber joists, at 400mm or 450mm centres 

to suit board length, using 32mm GTEC High Thread screws. 

GTEC Resistant Bars can be jointed by lapping together 

directly over joists. 

2. Insert 100mm mineral wool quilt in the cavity above the 

Resilient Bars. Use insulation to fully pack void between 

joists and walls. 

3. Butt plasterboards to wall perimeters whilst fixing. Screw-fix 

plasterboards to the underside of the GTEC Resilient Bars at 

230mm centres in the field of the plasterboard and 150mm 

centres at cut edges and board joints, ensuring that the 

screws do not penetrate the joist framework. See table 2 

for recommended screw lengths. Stagger joints and fixings 

between layers. 

4. Seal perimeter edges with GTEC Intumescent Acoustic 

Sealant to maintain the performance of the system. 

New Ceiling 

2 layers of 


GTEC Joist 



GTEC Resilient tape 

GTEC Plank 

Retaining an Existing Ceiling 

Where it is desired to retain an existing ceiling as a feature, 

increased sound insulation can still be obtained by installing 

the floor system from above. Fire resistance and acoustic 

performance can be improved with the use of an extra layer 

of 15mm GTEC Fire Board inside the ceiling cavity. 

Where there is strutting between floor joists it may be 

necessary to leave gaps in the GTEC Metal Angle and GTEC 

Plank. GTEC Resilient Tape should be applied to the tops of 

full depth solid struts. 

Note: GTEC Fire Board and GTEC Intumescent Acoustic 

Sealant are installed from above. 

GTEC Acoustic 

Floor Clip 

GTEC 

Intumescent 


Mineral Wool 

Insulation 

Existing Ceiling 


51

INSTALLATION 

1 

Place GTEC Acoustic Floor Clip over joist and 

hold against the joist side. Secure by driving 

the serrated edge of the clip into the top of the 

joist with a hammer. 

Space clips at maximum 400mm centres on 

either side of the joist, except at the perimeter, 

where clips should be fixed at 400mm centres 

on the open side only. 

2 

Lay GTEC Metal Angle with the short leg into the 

clips. GTEC Metal Angle joins should be kept to a 

minimum. Where the joins occur, butt joint and 

support ends with a GTEC Acoustic Floor Clip. 

3 

Cut lengths of GTEC 19mm Plank 4mm shorter 

than the space between the joists ensuring 

you keep both bound edges intact. 

Maintaining an even gap between plank and 

joist place the GTEC Plank on the 

GTEC Metal Angle supports. 


4 

Fix self adhesive GTEC Resilient Tape along the 

length of each joist over the GTEC Acoustic Floor 

Clips and along intermediate full depth and 

perimeter noggings. 

5 

Lay the flooring across the joists at right angles. 

Tongue-and-Groove chipboard edges must be 

glued with PVA wood glue. Leave a 3mm gap 

between flooring and the perimeter wall and 

seal the gap with GTEC Intumescent Acoustic 

Sealant before skirtings are fitted. 

Screw-fix through the flooring and GTEC Plank 

into the GTEC Metal Angle either side of each 

joist using 63mm GTEC Acoustic Floor screws at 

a maximum of 300mm centres ensuring that 

the fixings do not penetrate the floor joist. 

6 

The screws, when screwed home and 

countersunk, pull the GTEC Metal Angles out 

of the clips to clamp the GTEC Plank to the 

underside of the flooring and create a 

completely free-floating floor supported on 

the GTEC Resilient Tape. 


53

Lafarge GTEC: 

Acoustic Floor System 

Lafarge GTEC Acoustic Floor System is 

a free-floating, sound insulating floor 

system for structural joist framing. 

It is designed as a separating floor 

between and within dwellings, and can 

be used with Lafarge GTEC Wall Lining 

and Partition Systems. The system is 

intended for newbuild, conversion and 

improvement work, and in particular 

for the remedial treatment of existing 

timber joist floors. 

Applications 

• Newbuild, conversion and 

improvement work. 

• Particular to remedial treatment 

of existing floors. 

Components 

GTEC Resilient 

Bar Deep 

GTEC Acoustic 

Floor Clip 


GTEC 

Resilient 

Tape 

GTEC Acoustic 

Floor screws 

Lafarge 

code 

RBD3000 

RAFC25 

MFC2330 

RAFT50 

63AFST500 

Dimensions 

3000mm 

length 

17mm deep 

- 

3600mm 

50mm wide 

12metres 

length 

63mm 

Benefits 

• Sound absorption with minimal 

overall thickness. 

• Exceptional airbourne and impact 

resistance sound insulation. 

• 60 minutes fire resistance. 


screws** 


screws* 

various 

various 

ranging 

from 

25 to 

86mm 

ranging 

from 

32 to 

96mm 


Acoustic 

Sealant 

GTEC 

Fire 

Board 

GTEC 

Plank 

ACOUSTIC 

(INTU) 

ACO38 

(INTU) 

AC060 

(INTU) 

See GTEC 

Product 

Selector 


Guide for 

details 

See GTEC 

Product 

Selector 


Guide for 

details 

0.9 litre 

0.38 litre 

0.6 litre 


various 

various 

*See GTEC Fixings Installation Guide for full details. 

**For fixing to Resilient Bar 


The Lafarge GTEC Dryliner System 

is a variable height ceiling ideal 

for commercial use. 

Ceilings: 

GTEC Dryliner

CEILINGS: GTEC Dryliner 

GTEC Dryliner 

Channel Connector 

Joist 

GTEC Joist 

Connector 

Mineral Wool Batts 


Double Layer Boarding 

Note: With two-layer 

boarding, stagger joints 

and fixings between layers. 

Table 3: Selection of Dryliner components 

Component Lafarge Length Maximum Timber Concrete 

code (mm) cavity (mm) floors floors 

GTEC Dryliner Channel RD1 2400, 3000 - ✓ ✓ 

GTEC Dryliner Channel Connector RD3 100 - ✓ ✓ 

GTEC Joist Connector RD5 - 65 ✓ - 

RD10 - 120 ✓ - 

GTEC Dryliner Track RD9 3000 - ✓ ✓ 

GTEC High Thread screw 32DHT1000 32 - ✓ - 

GTEC SR Bracket RD2 - 25-60 ✓* ✓ 

GTEC XR Bracket RD11 - 25-130 ✓* ✓ 

GTEC Self Tapping screws 25DST1000 25 

41DST1000 41 

GTEC Pan Head screws 11PHST500 11 - - ✓ 

*Used for upgrading of timber joist floors where existing ceiling is to be retained 


Upgrading existing timber joist floor 

(ceiling retained) 

1. Set out GTEC Dryliner Track RD9 as steps overleaf 

2. Set levels, mark the centre line of each joist on the existing 

ceiling, and secure GTEC SR Brackets RD2 to joists with two 

32mm GTEC High Thread screws with spacing as table 2. 

Fold down the legs after fixing. 

3. Locate the GTEC Dryliner Channel RD1 as step 3 overleaf. 

Existing 

Ceiling 

GTEC Dryliner Bracket 

into joist 

Mineral Wool 

Insulation 

4. Secure the GTEC Dryliner Channel to each leg of the GTEC 

SR Bracket RD2 with GTEC Pan Head Self Tapping screws 

11PHST500. Where necessary bend back the legs of the GTEC 

Dryliner GTEC SR Bracket if they protrude past the face of the 

channel. 


5. Install the mineral wool insulation and plasterboards as steps 

4 and 5 overleaf. 

Concrete Soffit 

GTEC Dryliner Bracket 

Mineral Wool Insulation 


Installation to Concrete Floor Slab 

1. Fix the GTEC Dryliner Track RD9 at 600mm centres to 

perimeter walls allowing for required cavity/ceiling height. 

2. Mark horizontal lines at 400mm or 450mm maximum 

centres on the underside of the slab to locate GTEC Dryliner 

Channels RD1. 

3. Position the GTEC Dryliner SR Brackets RD2 directly to 

underside of the slab along marked lines (see table 2). Fold 

down the legs and secure to underside with suitable fixing 

through horizontal slot. 

4. Cut the GTEC Dryliner Channel RD1 5mm shorter than the 

length of the ceiling required and locate the Dryliner Channel 

RD1 into GTEC Dryliner Track. 

5. Ensure the GTEC Dryliner Channel RD1 is level. Secure GTEC 

Dryliner Channel RD1 to each leg of GTEC SR Bracket using 

GTEC Pan Head screws 11PHST500. Where necessary bend 

back the legs of the GTEC SR Bracket if they protrude past the 

face of the channel. Where the ceiling length exceeds channel 

length, connect two lengths of channel together with GTEC 

Dryliner Channel Connectors RD3. 

6. Where required insert mineral wool insulation above the 

framing ensuring that the mineral wool forms one continuous 

lining. 

7. Fix the plasterboards with long edges at right angles to 

GTEC Dryliner Channels RD1, butt firmly against the perimeter 

and fix to the framing with GTEC Self Tapping screws at 

230mm maximum centres and 150mm maximum centres at 

perimeter and cut end of the plasterboard. Butt edges lightly 

against each other and centre edges of the plasterboard over 

the channels. 


57

INSTALLATION 

1 

Mark position on walls for desired clear 

space/ceiling height, taking into account 

the thickness and number of layers of 

plasterboards to be used. Fix the GTEC 

Dryliner Track RD9 to walls and around 

columns etc at 600mm maximum centres. 

Mark walls on the underside of the GTEC 

Dryliner Tracks that are parallel to joists for 

position of the GTEC Dryliner Channels RD1. 

Spacing as table 1. 

2 

Set levels and secure the GTEC Dryliner Joist 

Connecter RD5 or RD10, depending on cavity 

depth, to side of joist, on line of GTEC Dryliner 

Channel with two 32mm GTEC High Thread 

screws 32DHT1000 spaced as table 2. Ensure 

GTEC Joist Connectors are level. 

3 

Offer the GTEC Dryliner Channel to the GTEC 

Joist Connectors and twist to secure. Where 

necessary extend the length of the GTEC 

Dryliner Channel by connecting two lengths 

of GTEC Dryliner Channel together with GTEC 

Dryliner Channel Connector RD3. 


4 

Cut the GTEC Dryliner Channel RD1 5mm 

shorter than the length of the ceiling required 

and locate the GTEC Dryliner Channel RD1 into 

the GTEC Dryliner Track. 

Where required insert mineral wool batts 

above the framing ensuring that the mineral 

wool forms one continuous lining. 

5 

Fix plasterboards with the long edges at right 

angles to the GTEC Dryliner Channels. Screw-fix 

the boards to the GTEC Dryliner Channels 

at 230mm maximum centres and 150mm 

maximum centres at perimeters and the cut 

ends of board. 

With two layers of plasterboard, stagger all the 

joints between the layers. For the typical single 

layer and two-layer plasterboard layouts, see 

diagrams overleaf. 

Table 1: Maximum framing centres 

Board thickness Board length GTEC Dryliner 

(mm) (mm) Channel centres (mm) 

12.5 2400 400 

1800, 2700 450 

3600 450 

15 and 19 2700 450 

other lengths 600 

Table 2: Centres for GTEC Joist Connectors and 

GTEC SR Brackets 

Board thickness 

9.5mm plasterboard single layer 600 



All double layer boarding 600 

Maximum (mm) 


59

Lafarge GTEC 

Dryliner Ceiling 

System 

Lafarge GTEC Dryliner System is a 

simple, quick and completely dry ceiling 

system suitable for any internal 

application to provide high levels of fire 

protection and sound reduction, and the 

accommodation of services. 

Using the appropriate components, the 

system may be fixed directly to new or 

existing timber joist floors and concrete 

soffit. With existing timber joist floors, 

the ceiling may be retained and covered 

with a new plasterboard lining. 

Components 

GTEC Dryliner 

Channel 

GTEC Dryliner 

Track 


Connector 

GTEC Dryliner Joist 

Connector 

Lafarge 

code 

Dimensions 

RD1 2.4m 

3.0m 

RD9 

RD3 

RD5 

RD10 

3.0m 

- 

100mm 

180mm 

Applications 

• For any internal application. 

• Where services must be accommodated. 

• To upgrade and protect existing 

structures. 

Benefits 

• Can produce a flat ceiling despite 

uneven timber joists. 

• Allows a cavity width of 25mm 

to 130mm. 

• Suitable for direct decoration 

or textured finish. 

• Improved acoustic and fire performance. 

GTEC SR 

Bracket 

GTEC XR 

Bracket 

GTEC High 

Thread 

screws 

GTEC 

Self Tapping 

screws 

RD2 

RD11 

32DHT1000 

25DST1000 

41DST1000 

25-65mm 

cavity 

25-130mm 

cavity 

32mm 

25mm 

41mm 



11PHST500 

11mm 

GTEC Board 

See GTEC 

Product 

Selector 


Guide for 

details 

various 


The Lafarge GTEC Suspended MF 

Ceiling System is designed for 

variable height ceilings and is 

ideal for commercial use. 

Ceilings: GTEC 

Suspended MF

CEILINGS: GTEC Suspended MF 

GTEC Ceiling Channel 

GTEC Primary Channel 


GTEC Soffit Cleat 

Frame formed from 

GTEC Edge Channel 

GTEC Metal Angel 

Note: Where ceiling weight exceeds 20 kg/m 2 

(most double plasterboard systems) use GTEC 

Wafer Head screws in lieu of GTEC Connecting 

Clips. Lafarge recommend that all double board 

systems are screw fixed. 


Metal Angle fixing 

Table 1: Recommended maximum loadings and spacing of 

primary components 

Suspension GTEC Primary Maximum loading 

Centres Channel Centres including plasterboard 

(mm) (mm) (kg/m 2 ) 

1200 600 74 

1200 900 50 

1200 1200 35 

Table 2: Board dimensions and spacing of secondary 

components 

Board Board Ceiling Channel 

Thickness Length Centres 

(mm) (mm) (mm) 

12.5 2400 400 

1800, 2700, 3600 450 

3000 600 

15 and 19 2400 400 

2700 450 

3000 600 



GTEC Connecting Clip 

60 x 60mm rock mineral 

wool insulation 


The continuity of the plasterboard and supporting structure 

should be broken by movement control joints: 

1. Where the ceiling runs 10 metres or more in any 

direction 

2. Where the ceiling crosses structural movement joints. 


Ceiling Channel A 


60 x 100mm rock mineral 

wool insulation 

Ceiling Channel B 

Movement joints running parallel to the 

Ceiling Channels: 

Locate GTEC Ceiling Channels along each side 60mm from 

the movement joint (measured to centres). Secure GTEC 

Ceiling Channels to GTEC Primary Channels with GTEC 

Connecting Clips. 

Leave a 12.5mm gap in the runs of GTEC Primary Channel 

as wide as the movement joint, and support the cut ends 

of the GTEC Primary Channels with hangers. When 

boarding the ceiling, leave a 12.5mm continuous gap along 

the line of the movement joint. 


GTEC Ceiling 

Channel 


GTEC Movement 

Control Joint 


GTEC Ceiling 

Channel fixed 

vertically to edge 

channels at top and 

bottom. 


Movement joints running across the 

Ceiling Channels 

Form a 12.5mm gap along the line of the movement joint, 

supported by GTEC Primary Channels 60mm from each 

side of the joint. The GTEC Ceiling Channels A and B 

should overlap by 50mm but not fixed. 

To maintain the acoustic and fire integrity of the ceiling, 

pack the space behind the joint with 60mm rock mineral 

wool insulation with a density of 23 kg/m 3 . 

When boarding the ceiling, leave a 12.5mm continuous 

gap along the line of the movement joint. 

Ceiling Recess 

Ceiling recess detail incorporating a change in ceiling 

height is suitable for a maximum change in level 

of 600mm. 


63

INSTALLATION 

1 

Mark the position on walls for the finished 

ceiling height taking into account the thickness 

and number of layers of plasterboard to be 

used. Fix the GTEC Edge Channels to walls at 

600mm maximum centres. 

For the location of the GTEC Primary Channels, 

mark lines on the ceiling at centres in 

accordance with the thickness and number 

of layers to be used. See table 1. 

2 

Attach GTEC Soffit Cleats to the structural soffit 

at 1200mm centres along the centre lines for 

GTEC Primary Channels. 

Cut lengths of GTEC Metal Angle equal to the 

vertical distance from the GTEC Soffit Cleats to 

the top of the edge channels. Fix GTEC Metal 

Angle to the GTEC Soffit Cleats with appropriate 

Nut and Bolt. 

A GTEC Soffit Cleat is not required for timber joist 

floors. Instead, fix GTEC Metal Angles direct to the 

sides of timber joist with a minimum overlap of 

50mm using a minimum of 2 suitable fixings. 

3 

Fix GTEC Primary Channel to GTEC Metal Angles 

with two GTEC Pan Head Self Drilling screws. 

Where necessary, join the GTEC Primary Channel 

by overlapping 150mm back to back and fixing 

with two appropriate Nuts and Bolts. 


4 

Secure the GTEC Ceiling Channels at right 

angles to the underside of the GTEC Primary 

Channels, at centres as specified in table 2, 

using GTEC Connecting Clips. 

For the entire length of each GTEC Primary 

Channel, alternate GTEC Connecting Clips on 

each side. 

5 

Position the boards with bound (long) edges 

at right angles to the GTEC Ceiling Channel 

sections, with adjoining edges lightly butted. 

End joints must occur at the centre of the GTEC 

Ceiling Channel section, staggered by half a 

board length whenever possible. 

6 

Across field of board, screw-fix the plasterboard 

at 230mm max. centres with GTEC Self 


Screw fix the cut edges of the plasterboard 

at 150mm max. centres to the GTEC Ceiling 

Channel. Similarly screw fix all edges to the 

GTEC Edge Channel at 150mm centres. 


65

Lafarge GTEC 

Suspended MF 

Ceiling System 

The Lafarge GTEC Suspended MF Ceiling 

System is ideal for commercial 

applications. Ceiling height may be 

varied to accommodate services, ducting 

etc. Providing a high performance ceiling 

with sound insulation and fire protection, 

Lafarge GTEC MF Suspended Ceiling 

system can be used to upgrade and 

protect existing structures. 

Applications 

• Ideal for commercial applications. 


• To upgrade and protect existing 

structures. 

Benefits 

• Ceiling height may be varied. 

• Compatible with Lafarge GTEC 

Partition System. 

• Suitable for direct decoration or 

textured finish. 


• Suspend heavy loads, air ducting, lighting 

units etc. directly from structural soffit to 

avoid loading of the suspension framing. 

See table 1. 

• Always alternate GTEC Connecting Clips 

on primary channels. 

• When more than one layer of plasterboard 

is installed. The GTEC Ceiling Channel 

should be screw fixed to the GTEC Primary 

Channel. 

Components 

GTEC 

Primary 

Channel 

GTEC Ceiling 

Channel 

GTEC Edge 

Channel 

GTEC Metal 

Angle 

GTEC 

Strap 

Hanger* 

GTEC 

Connecting 

Clip 

GTEC Soffit 

Cleat 

Appropriate 

Nut & Bolt 


Drilling screws 


screws 

GTEC Wafer 

Head Self 

Drilling screws 

GTEC Board 

Lafarge 

code 

MFCP44 

MFCC50 

MFCE26 

MFC2330 

MFCSTRAP 

MFCCLIP3 

MFCCLEAT 

11PHSD500 

various 

14WHSD500 

See GTEC 

Product 


Guide 

Selector for 

details 

Dimensions 

3600mm 

3600mm 

3600mm 

3600mm 

25M roll 

200 

per box 

200 

per box 

11mm 

ranging 

from 

25 to 86mm 

14mm 

various 

* GTEC Strap Hanger may be used in lieu of GTEC Metal Angle for 

ceiling depths up to 1 metre. 


The Lafarge GTEC T-Bar Corridor 

System is a unique system to 

Lafarge and is the latest addition 

to its ceiling range. It has been 

designed to provide the contractor 

with a faster, labour saving, high 

performance one-stop-shop 

ceiling solution. 

Ceilings: GTEC 

T-Bar Corridor 

System

CEILINGS: GTEC T-Bar Corridor System 

Edge detail 

GTEC T-Bar Edge 

Channel fixed to 

Corridor Wall 

Typical ceiling opening made 

from GTEC Edge Channels/GTEC 

Metal Angle Hanger 

5-10mm 

Gap 

GTEC T-Bar Corridor Span T 

Spanning Corridor @ max 

450mm centres 

Maximum load table: Flat and Corridor ceiling 

** 

GTEC T-Bar Hangers centre Maximum loading Maximum loading 

Primary (along the GTEC T-Bar including plasterboard including plasterboard 

Main T (mm) Primary Main T-bar) in mm (kg/m 2 ) (GTEC Metal Angle) (kg/m 2 ) (Wire 2mm) 

recommended for 

1200 1200 35* 19** 

single layer board 


1200 900 50* - 

double layer board 

* Loading is based on 2 screws fixed to GTEC T-Bar Primary Main T with GTEC Metal Angle or GTEC Strap Hanger. 

** Wire to BS1052 installed as above (wire length = depth of drop + 200mm). Not recommended for double layer. 

Corridor span table 

GTEC Board GTEC T-bar Max span (m) Span with Span with Span with Max span (m) 

Corridor T span no hangers*** extra load extra load extra load with one centre GTEC 

centres (mm) of 2kg/m 2 of 5kg/m 2 of 10kg/m 2 Metal Angle Hanger*** 

Single Layer 

12.5mm std 300 2.05 2.00 1.90 1.75 4.1 

12.5mm std 400 1.95 1.85 1.75 1.65 3.9 

15mm std 450 1.85 1.80 1.70 1.60 3.7 

all board types 400 1.85 1.75 1.70 1.60 3.7 

Double layer 

all board types 400 or 450 1.6 1.55 1.50 1.45 3.2 

***other span details available on request including additional loading such as lighting. If a central hanger is required, the Lafarge GTEC Flat 

Ceiling System may use fewer hangers. For corridor spans greater than 2m, cut a GTEC T-Bar Primary Main T to length. 

Lafarge GTEC T-Bar Corridor Ceiling System – Material Calculator 

m 2 Span (m) Length (m) Drop (m) GTEC T-Bar Corridor Span T (No.Off) GTEC T-Bar Edge Channel (No.Off) 

18 1.8 10 1 24 8 

19 1.9 10 1 24 8 

20 2.0* 10 1 33 8 

Based on 400mm centres (excluding * which is 12.5mm Standard Plasterboard at 300mm centres). 


60 x 60mm rock mineral wool batt 

TO DO TYPEFACE 

100mm 

GTEC Corridor Span T 

43.0mm 

Front Elevation 

GTEC Movement 

Control Joint 

Wide flange for 

easier fixing of 

plasterboard 




1. Where the ceiling runs 10m or more in any direction 

2. Where the ceiling crosses structural movement joints 

Movement joints running parallel to the 

Corridor Span T 

Leave a 12.5mm gap in the runs of the GTEC T-Bar Corridor 

Span T as wide as the movement joint. 

Support the cut end of the GTEC T-Bar Corridor Span T with 

hangers no more than 50mm from the cut edge. When 

boarding the ceiling leave 12.5mm continuous gap along the 

line of the movement joint. 

Ceiling Openings 

For details contact Enquiryline. 

GTEC T-Bar 

Corridor Span T 

Boarding Along Corridor 

(recommended) 

Boarding Across Corridor 

Synia 

Synia 

Synia - The new plasterboard innovation from Lafarge. 

Synia is a unique plasterboard design from Lafarge that 

provides the ultimate flat ceiling in drylining. 

Traditionally, drylining plasterboards are manufactured with 

2 tapered edges in order to create a seamless finish when 

jointed. For ceilings this has presented installers with the 

problem of extra planing, labour costs and time for the 

cut ends. 

Synia has been created with a unique edge design which, 

once fixed, reveals a 4 tapered edge for jointing. This offers 

the installer a faster, easier solution, resulting in the ultimate 

flat ceiling. 


69

INSTALLATION 

1 


ceiling height taking into account the 

thickness and number of layers of 

plasterboard to be used. Fix the GTEC T-Bar 

Edge Channel TE3000 to walls at 600mm 

maximum centres (short length uppermost). 

2 

Cut the GTEC T-Bar Corridor Span T TS2000 as 

required to the corridor width and slide into 

GTEC T-Bar Edge Channel TE3000, at 

recommended centres (400 or 450mm). 

If hangers are required (see span table), fix the 

GTEC T-Bar Corridor Span T TS2000 to the GTEC 

Metal Angle with 2 GTEC Pan Head Self Tapping 

screws. 


3 

Position the boards with long edges typically parallel to 

the GTEC T-Bar Edge Channel TE3000 with adjoining 

edges lightly butted. End joints must occur at the centre 

of the GTEC T-Bar Corridor Span T TS2000 section, 

staggered by half a board length whenever possible. 

Screw fix the plasterboard at 230mm max centres with 

drywall GTEC Self Tapping screws on the Span T. 

Screw fix the cut edges of the plasterboard at 150mm 

max centres to the GTEC T-Bar Corridor Span T TS2000. 

Screw fix all perimeter edges to the GTEC 

T-Bar Edge Channel TE3000 at 150mm centres. 

It is also possible to fix the plasterboard with long edges 

parallel to the GTEC T-Bar Corridor Span T TS2000 with 

adjoining edges lightly butted. 


71

Lafarge GTEC 

T-BAR Corridor 

Ceiling System 

Components 

GTEC T-Bar 

Edge Channel 

Lafarge 

code 

TE3000 

Dimensions 

3000mm 

The Lafarge GTEC T-Bar Corridor Ceiling 

System is a unique system to Lafarge and 

is the latest addition to its ceiling range. 

It has been designed to provide the 

contractor with a faster, labour saving, 

high performing one-stop-shop ceiling 

solution. 


GTEC Span T 

Corridor 

MFC2330 

TS2000 

3600mm 

2000mm 

Applications 

• Ideal for commercial and residential 

applications, whether new build or 

renovation. 

GTEC Strap 

Hanger 

MFCSTRAP 

25LM 


• To upgrade and protect existing structures. 

• For corridor spans up to 2.05m 

(with 12.5mm standard plasterboard 

@ 300mm centres - See Load/Span Table). 

GTEC 

Soffit Cleat 

MFCCLEAT 

200 

per box 

Benefits 

• No hanger required for spans of up to 2m. 

Appropriate 

Nut & Bolt 


• Fire tested to BS 476: Part 23. 

• Strong steel construction. 

GTEC T-Bar 

Suspension Wire 

TW 

160mm 

• Quick to install. 

Safety 

• The ceiling system within this literature will 

not support foot traffic. It is important that 

the recommended loading stated in this 

literature is not exceeded; if in doubt 

please contact your local Lafarge 

representative. 

• It is important that the maximum size 

of a ceiling without either a supporting 

partition, joint or break should be 

15m x 15m (225m 2 ). 

GTEC 

Pan Head Self 


GTEC 

Drywall 

Self Tapping 

screws 

11PHST500 

Various* 

GTEC Board 

See GTEC 

Product 

Selector 


Guide for 

details 

* See the GTEC Fixings Installation Guide for details. 

11mm 

ranging 

from 

25 to 

86mm 

various 


The Lafarge GTEC T-Bar Flat Ceiling 

System is unique to Lafarge and 

is the latest addition to its ceiling 

range. It has been designed to 

provide the contractor with a faster, 

labour saving, high performing 

one-stop-shop ceiling solution. 

Ceilings: 

GTEC T-Bar Flat 

Ceiling System

1200mm 

CEILINGS: GTEC T-Bar Flat Ceiling System 

GTEC Metal Angle (Screwed) or 

Wire Fixed to T-Bar 

1200mm 

400mm 

Typical ceiling opening made 

from GTEC Edge Channels 

(hanger may be required) 

5-10mm 

Gap 


Edge detail 

Hanger fixing 

GTEC T-Bar Cross T connection 

Maximum load table: Flat and Corridor ceiling 

GTEC T-Bar Hangers centre Maximum loading Maximum loading 

Primary Main T (along the Primary including plasterboard including plasterboard 

centre (mm) Main GTEC T-Bar) in mm (kg/m 2 ) (GTEC Metal Angle) (kg/m 2 ) (Wire 2mm) 

1200 1200 35* 19** 

1200 900 50* - 

NOTE: For 900mm board and 1800mm lengths, with 400mm Cross T spacing, an extra GTEC T-Bar Cross T will 

be required at the end of the board. Cross T spacing of 600mm may be used with single layer 15mm standard or 

Firecheck plasterboards. 

* Loading is based on 2 screws fixed to Primary Main T with Metal Angle or Strap Hanger. 

** Wire to BS1052 installed as above (wire length = depth of drop + 200mm). Not recommended for 

double layer. 


single layer board 


double layer board 


GTEC T-Bar Primary 

Main T 

60x60mm rock mineral wool batt 

100mm 




1. Where the ceiling runs 10m or more in any direction 

2. Where the ceiling crosses structural movement joints 

GTEC T-Bar 

Metal Angle 

GTEC T-Bar Cross T 

fixed vertically to 

TO DO TYPEFACE 

edge channels at 

top and bottom. 

GTEC T-Bar 

Cross T 

GTEC T-Bar 

Main T 


GTEC T-Bar Edge Channels 

GTEC T-Bar Main T 

GTEC T-Bar Edge Channels 

Wide flange for 

easier fixing of 

plasterboard 

Movement joints running parallel 

to the Cross T’s 

Leave a 12.5mm gap in the runs of either the GTEC T-Bar 

Primary Main T or Cross T as wide as the movement joint. 

Support the cut end of the primary Main T’s or Cross T’s 

with hangers no more than 50mm from the cut edge. When 

boarding the ceiling leave 12.5mm continuous 

gap along the line of the movement joint. 

Bulkheads 

Hangers at 1200mm or 900mm centres as required. 

GTEC T-Bar Cross T’s at 400mm centres. 

Ceiling Recess 

Ceiling recess detail incorporating a change in ceiling height 

is suitable for a maximum change in level of 600mm. 

Ceiling Openings 

For details contact Enquiryline. 

100mm 

43.0mm 

Front Elevation 

Side Elevation 

For use with GTEC T-Bar 

Suspension Wire 

Synia 

Synia 

Synia - The new plasterboard innovation from Lafarge. 

Synia is a unique plasterboard design from Lafarge that 

provides the ultimate flat ceiling in drylining. 

Traditionally, drylining plasterboards are manufactured 

with 2 tapered edges in order to create a seamless finish 

when jointed. For ceilings this has presented installers 

with the problem of extra planing, labour costs and time 

for the cut ends. 

Synia has been created with a unique edge design 

which, once fixed, reveals a 4 tapered edge for jointing. 

This offers the installer a faster, easier solution, resulting 

in the ultimate flat ceiling. 


75

INSTALLATION 

1 


ceiling height, taking into account the thickness 

and number of layers of plasterboard to be 

used. Fix the GTEC T-Bar Edge Channels TE3000 

to walls at 600mm maximum centres (short 

length uppermost). 

2 

Attach GTEC Soffit Cleats to the structural soffit at 1200mm 

or 900mm centres depending on the load along the axis of 

the Main T. 

Cut lengths of GTEC Metal Angle equal to the drop of the 

ceiling, from the GTEC Soffit Cleats to the start of the 

horizontal flange (minimum drop 50mm). 

Fix GTEC Metal Angle to GTEC Soffit Cleats with appropriate 

Nuts and Bolts (GTEC Soffit Cleat is not required for timber 

joist floors). For timber joists, fix GTEC Metal Angle direct to 

sides of joist with a minimum overlap of 50mm using a 

minimum of 2 GTEC High Thread screws. (Min 25mm depth 

into timber). 

NOTE: As an alternative, GTEC Hanger Wire or strap hanger 

may be used instead of GTEC Metal Angle. 

3 

Fix the GTEC T-Bar Primary Main T TP3700 to 

the GTEC Metal Angles with 2 GTEC Pan Head 

Self Tapping screws. 

To fix two Main T’s, simply connect together. 

It is not necessary to stagger the Main T-Bar 

connection. 


4 

Fix GTEC T-Bar Cross T TC1200 to GTEC Primary 

Main T TP3700 at typical 400mm centres to 

form grid pattern. Push-fit until clip is locked 

into position, with the triangle shape (spring 

side) of the clip visible on each side. 

To remove GTEC T-Bar Cross T TC1200, 

press on end of connector clip and 

pull out (may require some slight 

twisting). 

5 

Position the boards with long edges parallel to the GTEC 

T-Bar Primary Main T TP3700, with adjoining edges lightly 

butted. Board edge must be positioned at the centre of the 

GTEC T-Bar Cross T TC1200 section, staggered by half a 

board length whenever possible. 

Screw fix the plasterboard at 230mm max centres with 

drywall GTEC Self Tapping screws on the GTEC T-Bar Cross T 

TC1200, 10mm minimum from the edge of the board. 

Screw fix the cut edges of the plasterboard at 150mm max 

centres to the T-Bar. Also screw fix all perimeter boards to 

the GTEC T-Bar Edge Channel TE300 at 150mm centres. 

When using double layer plasterboard, the first layer is fixed 

as step 5 and the second layer should be fixed with all 

joints staggered in relation to the first layer. 


77

Lafarge GTEC T-Bar 

Flat Ceiling System 

Components 

Lafarge 

code 

Dimensions 

The Lafarge GTEC T-Bar Flat Ceiling 

System is unique to Lafarge and is the 

latest addition to its ceiling range. It has 

been designed to provide the contractor 

with a faster, labour saving, high 

performing one-stop-shop ceiling solution. 

GTEC T-Bar Primary 

Main T 

GTEC T-Bar 

Cross T 

TP3700 

TC1200 

3700mm 

1200mm 

Applications 

• Ideal for commercial and residential 

applications, whether new build or 

renovation. 


• To upgrade and protect existing structures. 

GTEC 

Edge 

Channel 


TE3000 

MFC2330 

3000mm 

3600mm 

Benefits 


• Fire tested to BS 476: Part 23. 

• Strong steel construction. 

• Quick to install. 

GTEC Strap 

Hanger 

GTEC 

Soffit Cleat 

MFCSTRAP 

MFCCLEAT 

25LM 

200 

per box 


• Suspended heavy loads, air ducting, 

lighting units etc directly from structural 

soffit to avoid loading of the suspension 

framing. 

Safety 

• The ceiling system within this literature will 

not support foot traffic. It is important that 

the recommended loading stated in this 

literature is not exceeded; if in doubt 

please contact your local Lafarge 

representative. 

• It is important that the maximum size of 

a ceiling without either a supporting 

partition, joint or break should be 

15m x 15m (225m 2 ). 

Appropiate Nut & Bolt 

GTEC T-Bar 

Suspension 

Wire 

GTEC 

Pan Head Self 


GTEC 

Self Tapping 

screws* 


screws 

TW 

11PHST500 

various 

32DHT1000 

160m 

11mm 

ranging 

from 

25 to 

86mm 

32mm 

GTEC Board 

See GTEC 

Product 

Selector 


Guide for 

details 

* See the GTEC Fixings Installation Guide for details. 

various 


Lafarge GTEC Taping and Jointing 

System is used for the seamless 

jointing of plasterboard. 

Finishing: 

GTEC Taping & 

Jointing System

FINISHING: Taping and Jointing System 

Internal Angles 

Tapered Edge Joints 

Jointing compound 

Jointing 

compound 

GTEC Joint Tape 

bedded in GTEC 

jointing compound 




Second coat of 


feathered out 

beyond first coat 

First coat of jointing 

compound struck 

off flush with 

plasterboard face 

Second coat of jointing 

compound feathered 

out beyond first coat 

First coat of 


struck off flush with 


Final coat of jointing 

compound feathered 

out beyond second coat 

50-60mm 

Finishing coat 

of compound 

feathered out 50 

to 60mm beyond 

second coat 


Square and Cut Edge Joints 

External Angles 

Square edge plasterboard 

Tapered edge plasterboard 

Jointing 

compound 


or GTEC Allset Xtra 

Fill with GTEC 

Joint Filler 




GTEC Tape-On Bead 

or GTEC Flex Tape 

bedded in 

First coat of jointing 

compound down edge 

of Joint Tape 

250mm 

Final coat of 


feathered out on to 


200mm 

Second coat 

of jointing 

compound 

feathered 

out beyond 

first coat 

First coat of GTEC 

Joint Filler or 

GTEC Allset Xtra 

feathered out 

Final coat of 

GTEC Joint 

Compound 

feathered out 

Second coat 

of GTEC Joint 

Filler or GTEC 

Allset Xtra 

feathered out 

Note: GTEC Joint Filler and GTEC Allset Xtra are the only compounds 

suitable for bedding external corner protection 


81

INSTALLATION 

1 


Using a 4” taping knife, apply jointing 

compound to both sides of internal angle. 

2 


Bed the paper joint tape into corner and cover 

tape with jointing compound, striking off flush 

with the plasterboard face. 

3 


When the tape has set hard or fully dried, 

apply a second coat of jointing compound, 

feathering out beyond the edges of the 

first coat. 


4 


When set hard and fully dried, apply a finishing 

coat of air drying compound or GTEC Allset Xtra, 

feathering out beyond the edges of the second 

coat. Now allow the joint to dry fully. 

5 

Tapered Joints 

Using a 6” taping knife or trowel, apply jointing 

compound to tapered joint. 

6 


Bed paper joint tape into the compound and 

cover tape with jointing compound, striking off 

flush with the plasterboard face. 


83

INSTALLATION 

7 


When set hard or fully dried, apply a second 

coat of jointing compound, feather out beyond 

the edges of the first coat. 

When set hard or fully dried apply a finishing 

coat of air-drying compound or GTEC Allset 

Xtra, feathering out beyond the edges of the 

second coat. Now allow the joint to dry fully. 

8 

Square Edge Joints 

When taping square or cut edges, after 

bedding the tape apply a 200mm band of 

jointing compound down the edges of each 

side of the GTEC Joint Tape. 

9 


When set hard or fully dried, apply a second 

coat of jointing compound, feather out beyond 



10 


When set hard or fully dried, apply a third coat 

of jointing compound, feather out beyond the 

edges of the second coat. 

11 


Using a GTEC Jointing Sponge, clean all the 

edges of jointing compound on finishing coats 

to minimise sanding. Now allow the joint to 

dry fully. 

12 


Using tin snips, cut GTEC Flex Tape to length. 

Pre-crease tape so that the heat bonded metal 

strips face is in towards the plasterboard. 


85

INSTALLATION 

13 


Using a 4” taping knife, apply a 50mm wide 

band of GTEC Joint Filler or GTEC Allset Xtra on 

each side of the angle. 

14 


Bed the tape onto the corner. Once bedded, 

cover each side of the tape with a 100mm 

band of GTEC Joint Filler, feathered out onto 

plasterboard face. 

When set hard, apply a second coat of GTEC 

Joint Filler, feathered out 50 to 60mm beyond 


15 


When set hard, apply a finishing coat of 

air-drying compound or GTEC Allset Xtra, 

feathered out 50 to 60mm beyond the 

second coat. Now allow to dry fully. 


Lafarge GTEC Taping 

and Jointing System 

Lafarge GTEC Taping and Jointing 

System is used for the seamless jointing 

of plasterboard to walls and ceilings. 

Applications 

• Jointing of tapered edge plasterboard. 

• Jointing all flat, internal and external 

corner joints. 

• Jointing GTEC Profiles with plasterboard. 

Benefits 

• Continuous walls and ceilings created 

with ease. 

• Stronger joints than other alternative 

methods. 

• Fast setting and drying times, allow 

quicker decoration. 

• Only a small amount of material required 

on site compared to 

wet plaster. 


• Store jointing compounds and tapes in dry 

conditions, protected from damp and 

extreme temperatures. 

• When mixing powdered jointing 

compounds always leave to stand for the 

recommended time indicated on 

packaging. 

• Always ensure joints are fully dried before 

decoration. 

• Lafarge recommends the use of a coat of 

GTEC Universal Sealer prior to decoration. 

• Never use air-drying jointing compounds 

under GTEC Joint Filler or GTEC Allset Xtra. 

• Always ensure compounds are used in the 

correct sequence. 


All GTEC jointing compounds finish white, are 

exceptionally smooth to work with, and easy to sand 

for a very fine finish. 

There are six types: 

(a) GTEC Smartmix Vinyl based pre-mixed jointing 

compound for air-drying applications. Suitable for 

bedding tapes and finishing joints by the Premier or 

similar automatic taping tools or by hand. GTEC 

Smartmix is a three coat application system. 

(b) GTEC Smartmix Xtra is a lightweight, air drying 

pre-mixed joint cement for hand or mechanical 

jointing. 2 coat application. 

(c) GTEC Joint Cement is an air drying joint cement 

for hand or mechanical jointing. 3 stage application. 

(d) GTEC Joint Cement Xtra A lightweight air drying 

compound for bedding tapes and finishing joints, 

either by hand or using a machine. GTEC Joint 

Cement Xtra allows the jointing operation to be 

completed in two stages. 

(e) GTEC Joint Filler a setting compound for hand 

jointing. Not suitable for finishing. 

(f) GTEC Allset Xtra is a setting compound for hand 

jointing with low shrinkage. 2 coat application. 

Joint Tape 

GTEC Joint Tape is a white, perforated, cross fibre 

paper tape. hand or mechanically applied, which 

provides a superior level of joint reinforcement. 

External Corner Protection 

There are two types: 

(a) GTEC Flex Tape is a cross fibre tape reinforced with 

rust resistant steel strips. Bedded into position using 

GTEC setting compounds. No waste - cut to the 

required length using Tin Snips. 

(b) GTEC Tape-Ons are paper tape beads reinforced 

with galvanised metal, provides clean, crisp angles, 

wax coated to reduce paper burr. Pre-formed to 90°. 

Table 1: 

Jointing compound and component choice 

Compound Bedding Bedding Finishing Sanding 

corner tapes joint tapes coats paper 

GTEC Joint Filler • • 

GTEC Joint Cement • • 150 grit 

GTEC Smartmix • • 150 grit 

GTEC Smartmix Xtra • • 150 grit 

GTEC Allset Xtra • • • 120 grit 

GTEC Joint • • • 150 grit 

Cement Xtra 


87

Components 

Quantity 

Components 

Quantity 

GTEC Smartmix 

20 kg 


Sealer 

10 litres 

GTEC Joint Cement 

25 kg 

GTEC Drywall 

Sealer 

10 litres 

GTEC Joint Cement Xtra 

22.5 kg 

GTEC Jointing 

Sponge 

- 


12.5 kg 

GTEC Internal 

Corner Tool 

- 

GTEC Smartmix 

Xtra 

20 kg 

GTEC Allset Xtra 

10 kg 

GTEC Pole 

Sander 

- 


150m 

GTEC Hand 

Sander 

- 

GTEC Flex Tape 

33m 

GTEC Hammer 

Head Taping 

Knife 4” 

- 

GTEC 

Corner, 90° 

External 

GTEC 

Stop Bead 

9.5mm and 12.5mm 

2.4m 

3.0m 

3.0m 

GTEC Long 

Handle Broad 

Knife 

For further information on compounds, please 

refer to the GTEC Finishing Solutions brochure. 

- 


GTEC Cove is a simple and cost 

effective way of adding attractive 

and distinctive features to the 

wall and ceiling junction. 

Finishing: 

GTEC Cove

INSTALLATION 

Preparing and Fixing GTEC Cove 

Make sure the background is dry and rigid. Any wallpaper, 

whitewash, distemper or loose decorations should be removed. 

Brush over the surface to remove any remaining loose particles 

and dust. 

1 Using a chalk line strike guidelines on the ceiling and wall to 

the correct projection and depth. 

64mm for 90mm GTEC Cove 90 

84mm for 120mm GTEC Cove 120 

2 Using the guidelines on the wall, drive in the nails at 

1500mm centres to act as a temporary support while 

the GTEC Cove Adhesive sets. 

3 Using a fine-toothed saw cut all the pieces of GTEC Cove to 

length and mitre to fit the corners of the room. The mitres can 

be cut using a mitre block or template. Templates are included 

in this installation guide. 

Note: It is best practice to fit the longest lengths first and work 

in one direction around the room. If the room has a chimney 

breast start on the face of the chimney and work in one 

direction around the room. 

4 Mix the GTEC Cove Adhesive as per instructions on the bag. 

Apply the adhesive to the back of the cove along its full length 

on the surfaces that meet wall and ceiling. 

5 Sit the lengths of cove on the nails and press into position 

between the guidelines, carefully lining up joints and 

intersections. 

6 Clean off surplus adhesive with a filling knife and smooth using 

a sponge. 

7 Using GTEC Cove Adhesive fill any gaps between the cove 

and the wall or ceiling. Make good all internal and external 

junctions. 

8 Remove all the temporary nails once the GTEC Cove Adhesive 

has set and fill the nail holes. 

9 Using a damp sponge, clean off any adhesive residue from 

the walls, ceiling and cove surface. 

10 Apply one coat of GTEC Universal Sealer, or if a vapour control 

layer is required use two coats of GTEC Drywall Sealer, and 

decorate as required. 

1 

2 

3 

4 

Cover image courtesy of Bovis Homes 


5 

100mm 

GTEC Cove bonded with GTEC Cove 

Adhesive at ceiling to GTEC Standard 

Board strip 12.5mm x 100mm wide 

securely fastened to ceiling* 

100mm 

6 


Adhesive at ceiling to two GTEC Standard 

Board strips 12.5mm x 100mm wide 

securely fastened to ceiling* 

100mm 

The addition of plasterboard strips between 

the coving and the wall/ceiling can greatly 

enhance the coving feature. To facilitate 

decoration, ensure that the visible edges of 

the plasterboard strips are bound edges. 

See illustrations (right) for typical details using 

plasterboard strips. 

Install using the following method: 

1. Fix 12.5mm x 100mm strips of GTEC 

Standard Board with GTEC Cove 

Adhesive. 

2. Fix GTEC Cove to the wall and ceiling with 

GTEC Cove Adhesive. 

100mm 


Adhesive at wall and ceiling to 

GTEC Standard Board strip 

12.5mm x 100mm wide securely 

fastened to ceiling and wall* 


Adhesive at wall and ceiling to two 

GTEC Standard Board strips 

12.5mm x 100mm securely fastened 

to ceiling and wall* 

*Use square edge plasterboard, bound edges outward. 


91

Finishing: GTEC Cove 

GTEC Cove is a simple and cost 

effective way of adding attractive and 

distinctive features to the wall and 

ceiling junction. Designed for internal 

use, GTEC Cove can complement any 

room style. 

GTEC Cove is made from plaster 

encased in a strong paper liner. The 

square back profile and pure gypsum 

core provide high strength and rigidity 

giving easy fixing and good workability. 

Components 

GTEC Cove Adhesive 

GTEC Cove 90 

GTEC COVE 

Lafarge 

code 

COVE 

ADH 5 

(5kg) 

or 

COVE 

ADH 125 

(12.5kg) 

COVE 90 

Benefits 

• GTEC Cove is suitable for receiving most 

types of decoration including paint, 

applied paper borders and textured 

coatings. 

• GTEC Cove Adhesive dries white for ease 

of decoration and is ideal for filling and 

patching. 

64mm 

GTEC Cove 120 

84mm 

90mm 

120mm 

COVE 120 

Now lighter - 

making 

installations 

even easier! 

Sizes 

Girths Lengths Weights 

(mm) (mm) (kg/m) 

GTEC Cove 90 3000, 3600 0.9 

GTEC Cove 120 3000, 3600, 4200 1.0 


Instructions for marking and cutting mitres 

1. Place the GTEC Cove on the bench with the ceiling edge 

towards you as in Diagram 1. 

2. Measure the length of the wall and mark this length on the 

wall edge of the GTEC Cove. Remember to add an extra 

82mm for each external mitre. 

3. Select mitres A,B,C or D. 

4. Fold the template along the dotted lines to suit the 

selected mitre. 

5. Place the template with the selected mitre to the curve of 

the cove with the folded edges along the wall and ceiling 

edges following instructions on the curve. 

6. Using a pencil, mark the line following the edge of the 

template. Also mark the wall and ceiling edges. 

7. Select the correct mitre for the other end of the GTEC Cove. 

Mark as previously described. 

8. Hold the GTEC Cove firmly with the wall edge facing up. Using 

a fine toothsaw, cut along the line into the curved face of the 

GTEC Cove as shown in Diagram 1. 

9. Before fixing, hold the cut length of GTEC Cove in position to see 

if the mitres and length are correct. 

ALIGN WITH WALL LENGTH MARKS - THIS IS THE WALL EDGE 

CURVE FOR EXTERNAL MITRE B - PLACE ON RIGHT HAND EDGE OF GTEC COVE 

PLACE ON LEFT HAND EDGE OF GTEC COVE - CURVE FOR INTERNAL MITRE C 

THIS IS THE CEILING EDGE 

GTEC Cove 120 


93

CENTRE FOR EXTERNAL MITRE A - PLACE ON LEFT HAND END OF GTEC COVE 


DIAGRAM 2 

External Mitre Ceiling Edge 

A B Wall Edge C D 

GTEC Cove 120 

Wall 

Edge 

Ceiling 

Edge 

Internal Mitre 

DIAGRAM 1 

Bench 

Front 

PLACE ON RIGHT HAND END OF GTEC COVE - CURVE FOR INTERNAL MITRE D 




GTEC Cove 90 

Instructions for marking and cutting mitres 

1. Place the GTEC Cove on the bench with the ceiling edge towards you as in Diagram 1. 

2. Measure the length of the wall and mark this length on the wall edge of the GTEC 

Cove. Remember to add an extra 62mm for each external mitre. 

3. Select mitres A, B, C or D. 

4. Fold the template along the dotted lines to suit the selected mitre. 

5. Place the template with the selected mitre to the curve of the cove with the folded 

edges along the wall and ceiling edges following instructions on the curve. 

6. Using a pencil, mark the line following the edge of the template. Also mark the wall and 

ceiling edges. 

7. Select the correct mitre for the other end of the GTEC cove. Mark as previously described. 

8. Hold the GTEC Cove firmly with the wall edge facing up. Using a fine tooth saw, cut along 

the line into the curved face of the cove as shown in Diagram 1. 

9. Before fixing, hold the cut length of GTEC Cove in position to see if the mitres and length 

are correct. 


CURVE FOR EXTERNAL MITRE B - PLACE ON RIGHT HAND EDGE OF GTEC COVE 

PLACE ON LEFT HAND EDGE OF GTEC COVE - CURVE FOR INTERNAL MITRE C 


95

CENTRE FOR EXTERNAL MITRE A 

- PLACE ON LEFT HAND END OF GTEC COVE 

GTEC Cove 90 

DIAGRAM 2 

External Mitre Ceiling Edge 

Internal Mitre 

A B Wall Edge C D 

Wall 

Edge 

DIAGRAM 1 

Ceiling 

Edge 

Bench 

Front 

PLACE ON RIGHT HAND END OF GTEC COVE - CURVE FOR INTERNAL MITRED 




A guide to the GTEC Plasterboard 

Solutions range of plasterboard 

and associated compounds. 

Product Selector: 

GTEC Boards 

and Compounds

BOARDS AND COMPOUNDS SELECTOR 

GTEC Standard Board 

With tapered or square edges are available in a 

wide range of sizes. 

GTEC Vapour Board 

Has a metalised film bonded to one face, which 

acts as a vapour control layer and can also give 

improved thermal conductivity. 

BS EN 14190 

GTEC Plank 

GTEC Plank is 19mm thick, 600mm wide 

plasterboard. 

GTEC Moisture Board 

Designed for those areas where moisture and 

humidity resistance are required, including 

bathrooms and kitchens. 


Offers a higher degree of fire resistance than 

plasterboard. Also available as a moisture resistant 

version when both fire moisture resistance 

is required. 

BS EN 520 : 2005 Type A N/A A H1 D, F 

BS1230 : 1985 Type 1 1 1 3 & 4 5 

Linings 

GTEC Direct Bond* ✓ ✗ ✓* ✗ ✓ 

GTEC Dryliner ✓ ✓ ✓* ✓ ✓ 

GTEC Independent Wall Lining ✓ ✓ ✓ ✓ ✓ 

Partitions 

GTEC Metal Stud ✓ ✗ ✓ ✓ ✓ 

GTEC Acoustic Homespan ✗ ✗ ✗ ✗ ✗ 

GTEC Drywall Timber Stud ✓ ✗ ✓ ✓ ✓ 

Floors and Ceilings 

GTEC Direct to Timber ✓ ✓ ✓* ✓ ✓ 

GTEC Acoustic Floor ✗ ✗ ✓ ✗ ✓ 

GTEC Dryliner Ceilings ✓ ✓ ✓ ✓ ✓ 

GTEC Suspended MF Ceilings ✓ ✓ ✓ ✓ ✓ 

GTEC T-Bar Corridor System ✓ ✓ ✓ ✓ ✓ 

GTEC T-Bar Flat Ceiling System ✓ ✓ ✓ ✓ ✓ 

* Not a typical application 


GTEC E Board 

Designed for use in dwellings as defined by 

Approved Document E regulations. 

GTEC dB Board 

GTEC dB Board is a heavy duty plasterboard with 

improved acoustic performance. 

GTEC Acoustic Homespan Board 

For use with the Lafarge GTEC Homespan System. 

15mm thick, 900mm wide. 

GTEC Universal Board 

GTEC Universal Board is the ultimate in convience 

plasterboards, offering the user the assurance that 

the product will offer fire and acoustic performance 

combined with high levels of impact resistance. 

GTEC Megadeco 

Megadeco that is fire, sound and impact resistant 

plasterboard that has one decorative white face 

with a colour matched jointing system. 

GTEC Thermal Board 

Thermal Board is a range of plasterboard bonded 

to different types of insulation to suit a variety of 

thermal requirements. 

BS EN 13950 

SYNIA 

Synia is a unique plasterboard 

design which, once fixed, 

reveals four tapered edges 

for smoother joints. 

D D, I D D, F, I, R D, F, I, R N/A A 

1 1 1 5 5 N/A 1 

✓ ✓ ✗ ✗ ✓* ✓ ✗ 

✓ ✓ ✗ ✓ ✓ ✓ ✗ 

✓ ✓ ✗ ✓ ✓ ✓ ✗ 

✓ ✓ ✗ ✓ ✓ ✗ ✗ 

✗ ✗ ✓ ✗ ✗ ✗ ✗ 

✓ ✓ ✗ ✓ ✓ ✗ ✗ 

✓ ✓ ✓* ✓* ✓ ✓* ✓* 

✗ ✓ ✗ ✓* ✓ ✗ ✗ 

✓ ✓ ✓* ✓* ✓ ✓ ✓ 

✓ ✓ ✓* ✓* ✓ ✓ ✓ 

✓ ✓ ✓* ✓* ✓ ✓ ✓ 

✓ ✓ ✓* ✓* ✓ ✓ ✓ 

For further information on plasterboards, please refer to the GTEC Performance Boards brochure 


99

Use of Jointing Compounds 

Corner Bedding Filling Finishing Sanding 

tape tape coat coat paper 

GTEC Joint Filler ✓ ✓ ✓ ✗ 120 grit 

GTEC Joint Cement Xtra ✗ ✓ Not required ✓ 150 grit 

GTEC Smartmix ✗ ✓ ✓ ✓ 120 grit 

GTEC Joint Cement ✗ ✓ ✓ ✓ 150 grit 

GTEC Allset Xtra ✓ ✓ Not required ✓ 120 grit 

GTEC Smartmix Xtra ✗ ✓ Not required ✓ 150 grit 

* Whilst air-drying compounds are suitable for filling joints, it is necessary to leave adequate drying time betweeneach coat. 

For further information on compounds, please refer to the GTEC Taping & Jointing System Installation Guide 


GTEC drywall screws are designed 

specifically for use with drywall 

systems. All screws have extra 

sharp points for fast penetration 

and hardened threads for 

improved grip. 


GTEC Fixings

Key to colour coded packaging 

SELF TAPPING SCREWS 

For attaching plasterboard to light gauge 

metal wall and ceiling systems 


GTEC Megadeco Self Tapping 

GTEC Collated Self Tapping 

HIGH THREAD SCREWS For attaching 

plasterboard to timber framework 


GTEC Collated 


SELF DRILLING SCREWS 

For attaching plasterboard to heavy 

gauge metal wall and ceiling systems 

GTEC Self Drilling 

GTEC Pan Head Self Drilling 

GTEC Wafer Head Self Drilling 

SPECIALIST SELF TAPPING SCREWS 

GTEC Acoustic Floor Self Tapping 

GTEC Trim Head Self Tapping 

GTEC Pan Head Self Tapping 

GTEC Wafer Head Self Tapping 

FIXING SELECTOR 

Please note: Light gauge metal components have an approximate thickness of 0.5 to 0.7mm – use self tapping 

screws. Heavy gauge metal components have an approximate thickness of 0.7 to 1.2mm – use self 

drilling screws. 

GTEC screws are designed as high performing drywall fixings with sharp points and care should be 

taken when handling boxes or individual fixings. 


Screws 



For attaching plasterboard to light gauge metal stud partitioning and ceiling 

systems. 

Length Box Boxes Lafarge 

mm Gauge Quantity Per Carton Code 

25* 6 1000 12 25DST1000 

32* 6 1000 6 32DST1000 

38* 6 1000 6 38DST1000 

41 6 1000 6 41DST1000 

44 6 1000 6 44DST1000 

51 7 500 6 51DST500 

57 7 500 6 57DST500 

63 8 500 6 63DST500 

76 8 250 12 76DST250 

86 10 200 6 86DST200 

*Also available in full pallet quantity 

GTEC Collated Self Tapping 

Strips of 50 collated drywall screws for use with auto-feed drywall tools 



25 6 1000 10 25CDST1000 

35 6 1000 10 35CDST1000 

38 6 1000 10 38CDST1000 

44 6 1000 10 44CDST1000 

GTEC Pan Head Self Tapping 

For connecting light gauge metal components 



11 7 500 12 11PHST500 

GTEC Wafer Head Self Tapping 

For connecting light gauge metal components beneath plasterboard. 



14 8 500 12 14WHST500 


103

Screws 


GTEC Trim Head Self Tapping 

Self embedding screw for attaching wood trims to metal 



41 7 500 12 41THST500 

57 7 500 6 57THST500 

GTEC Megadeco Self Tapping 

A zinc coated drywall screw specifically designed for fixing Megadeco to 

light gauge metal and ceiling systems 



25 7 1000 12 25MST1000 

32 7 1000 6 32MST1000 

38 7 1000 6 38MST1000 

44 7 1000 6 44MST1000 

GTEC Acoustic Floor Self Tapping 

For use with the Lafarge GTEC Acoustic Floor System 



63 7 500 6 63AFST500 


Screws 

HIGH THREAD SCREWS 


For attaching plasterboard to timber stud partitioning and ceiling joists 



32 6 1000 6 32DHT1000 

38 6 1000 6 38DHT1000 

41 6 1000 6 41DHT1000 

51 7 500 6 51DHT500 

63 8 500 6 63DHT500 

76 8 250 12 76DHT250 

86 10 200 6 86DHT200 

96 10 200 6 96DHT200 

GTEC Collated High Thread 

Strips of 50 collated drywall screws for use with auto-feed drywall tools 



38 6 1000 10 38CDHT1000 

51 7 800 10 51CDHT800 


GTEC Self Drilling 

For attaching plasterboard to heavy gauge metal stud partitioning and 

ceiling systems. Also suitable for fixing GTEC Universal Board. 



25 6 1000 12 25DSD1000 

32 6 1000 6 32DSD1000 

38 6 1000 6 38DSD1000 

44 6 1000 6 44DSD1000 

67 8 500 6 67DSD500 

GTEC Pan Head Self Drilling 

For connecting heavy gauge metal components 



11 6 500 12 11PHSD500 


105

Screws 


GTEC Wafer Head Self Drilling 

For connecting heavy gauge metal components beneath plasterboard 



14 8 500 12 14WHSD500 

Lafarge Drywall Nails 

Zinc electroplated ring shanked nails with thin wide heads and long sharp 

diamond points for fixing plasterboards to timber framing. 

GTEC Drywall Nails 

Length Approx Pack Lafarge 

mm Quantity Size Code 

30 13200 20kg NAIL 30 ZINC 

40 11400 20kg NAIL 40 ZINC 

50 8600 20kg NAIL 50 ZINC 

65 4800 20kg NAIL 65 ZINC 

GTEC Nailable Plugs 

For the mechanical fixing of GTEC Thermal Boards. 

Length Approx Lafarge 

mm Quantity Code 

60 100 NP60 

80 100 NP80 

100 100 NP100 

120 50 NP120 

For further information on fixings, adhesives and renders, please refer to the GTEC 

Fixing Solutions brochure. 

106 


GTEC Ready Reckoners give a 

quick guide to the components 

and quantities needed to install 

a basic length of wall lining 

or partition. 

All GTEC components can be 

purchased or ordered through your 

nearest Lafarge drywall stockist. 


GTEC Ready 

Reckoners

GTEC READY RECKONERS 

Wall Linings: Lafarge GTEC Direct Bond System 

Material Calculator – These quantities are based on a 2.4m room height 

Wall Lining Length 12.5mm Plasterboard GTEC Universal Bonding Compound 

1200mm x 2400mm 

25kg Bag 

2.88m 2 3kg per m 2 

3m 7.2m 2 21.6kg 

5m 12m 2 36kg 

7m 16.8m 2 50.4kg 

Wall Linings: Lafarge GTEC Direct Bond System (GTEC Thermal Board) 


Wall Lining Length 12.5mm Plasterboard GTEC Universal Bonding Compound GTEC Nailable 

1200mm x 2400mm 25kg Bag Plugs 

2.88m 2 3kg per m 2 100 per box 

3m 7.2m 2 21.6kg 6 plugs 

5m 12m 2 36kg 10 plugs 

7m 16.8m 2 50.4kg 12 plugs 

Wall Linings: Lafarge GTEC Independent Wall Lining System 


Partition 15mm GTEC U Track GTEC C Stud GTEC GTEC Intumescent 

Length Plasterboard Length Length Self Tapping Acoustic Sealant Insulation 

1200mm x 

2400mm 3000mm 2400mm 25mm 0.9 ltr tube: (if required) 

2.88m 2 15 lm 

3m 7.2m 2 6 lm 14.4 lm 130 screws 0.7 ltr 0.35m 2 

5m 12m 2 10 lm 24 lm 215 screws 0.9 ltr 0.45m 2 



Wall Linings: Lafarge GTEC Dryliner System 

Material Calculator – These quantities are based on a 2.4m room height, joist width at 600mm 

Partition 12.5mm Track GTEC SR Channel GTEC Pan Head GTEC 

Length Plasterboard Length Bracket Length Self Tapping Self Tapping Insulation 

1200mm x 

2400mm 3000mm 100 per box 2400mm 500 per box 1000 per box (if required) 

2.88m 2 

3m 7.2m 2 6 lm 12 14.4 lm 28 screws 130 screws 7.2m 2 

5m 12m 2 10 lm 20 24 lm 52 screws 210 screws 12m 2 


GTEC Intumescent Acoustic Sealant should be used to seal all gaps at system perimeter 

Partitions: Lafarge GTEC Metal Stud System 



Length Plasterboard Length Length Self Tapping Acoustic Sealant Insulation 

1200mm x 

2400mm 3000mm 2400mm 25mm 0.9 ltr tube: (if required) 

2.88m 2 15 lm 


5m 24m 2 10 lm 24 lm 430 screws 0.9 ltr 12m 2 


Partitions: Lafarge GTEC Acoustic Homespan System 



Length Plasterboard Length Length Self Tapping Acoustic Sealant 

1200mm x 

2400mm 3000mm 2400mm 25mm 0.9 ltr tube: 

2.88m 2 15 lm 

3m 14.4m 2 6 lm 14.4 lm 260 screws 0.7 ltr 

5m 24m 2 10 lm 24 lm 430 screws 0.9 ltr 

7m 33.6m 2 14 lm 31.2 lm 600 screws 1.1 ltr 

N.B. This material calculator should only be used as a guide - it may not suit all circumstances. 

Contact Lafarge Technical Enquiryline for further assistance, on Telephone 01275 377789. 


109

Floors and Ceilings: Lafarge GTEC Acoustic Floor System 

Material Calculator – Quantities are per m 2 for Lafarge GTEC Acoustic Floor System 

Lafarge Product Joint Spacing Joint Spacing Joint Spacing 

Code Description 400mm 450mm 600mm 

RAFC25 GTEC Acoustic Floor Clips 13 clips 11.5 clips 8.5 clips 

RAFT50 GTEC Resilient Tape 2.5m 2.25m 1.7m 

MFC2330 GTEC Metal Angle 5.0m 4.5m 3.5m 

15mm GTEC dB Board 1.0m 2 1.0m 2 1.0m 2 

57mm GTEC Trim Head screws with: 

18mm T&G chipboard 18 screws 16 screws 12.5 screws 

18mm T&G softwood Boarding 

(or 63mm GTEC Acoustic Floor 

screws with 22mm T&G flooring) 39.5 screws 35 screws 27 screws 

GTEC Intumescent Acoustic Sealant 

for sealing around skirtings Not calculated by m 2 

Material Calculator – Quantities are per m 2 for Lafarge GTEC Ceiling System 

Lafarge 

Code 

Product 

Description 

RBD3000 GTEC Resilient Bars either 450 centres for 2.7m plasterboard = 2.22m 

or 400 centres for 2.4m plasterboard = 2.5m 

32DHT GTEC High Thread screws = 7 screws 

2 layers 15mm GTEC dB Board = 2.0m2 

25DST GTEC Self Tapping screws = 20 screws 

45DST GTEC Self Tapping screws = 20 screws 

Plus for all systems, GTEC jointing materials and GTEC Universal Sealer, GTEC Intumescent Acoustic Sealant to 

ceiling perimeters. 

Floors and Ceilings: Lafarge GTEC Dryliner Ceiling System. 

Material Calculator – These quantities are based on a 2.4m room height, joist width at 600mm 

Partition 12.5mm Track GTEC SR Channel GTEC Pan Head GTEC 

Length Plasterboard Length Bracket Length Self Tapping Self Tapping Insulation 

1200mm x 

2400mm 3000mm 100 per box 2400mm 500 per box 1000 per box (if required) 

2.88m 2 


5m 12m 2 10 lm 40 24 lm 52 screws 240 screws 12m 2 



Floors and Ceilings: Lafarge GTEC Suspended MF Ceiling System 

Material Calculator – These quantities are per m 2 

GTEC Primary Channels at 

Lafarge Code Description of Product 1200mm Centres 900mm Centres 600mm Centres 

MFCE26 


(perimeter of room concerned being the accurate figure) 0.6m approx 0.6m approx 0.6m approx 

MFCP44 GTEC Primary Channel 0.9m 1.2m 1.8m 

MFCC50 GTEC Ceiling Channel at 400mm centres 2.65m 2.65m 2.65m 

MFCCLIP 2.2 clip n/a or n/a or 

or 14WHSD GTEC Connecting Clip or GTEC Wafer Head Self Drilling screws or 5 screws 6 screws 9 screws 

MFC2330 GTEC Metal Angle, per 100mm ceiling drop 0.075m 0.1m 0.15m 

11PHSD 

GTEC Pan Head Self Drilling screws 

(to fix angle hanger to primary channel) 

Plus, if required, at the top of each MFC2330 metal angle hanger 2 screws 2 screws 3 screws 

MFCCLEAT GTEC Soffit Cleat GTE GTEC GTEC 

1 Soffit Cleat 1.25 Soffit Cleat 1.5 Soffit Cleat 

Appropriate Nut & Bolt 1Nut & Bolt 1.25 Nut & Bolt 1.5 Nut & Bolt 

Plasterboard fixing screws 

16 screws per m 2 per Board 

(length dependent upon Board thickness) 

Plus plasterboard and jointing materials or skim plaster, (plus mineral wool if applicable) 

Floors and Ceilings: Lafarge GTEC T-Bar Flat Ceiling and Corridor Systems 

Material Calculator – Lafarge GTEC T-Bar Flat Ceiling System 

Lafarge Code Quantity per m 2 Single Layer Board Double Layer Board 

TE300 


(perimeter of room concerned being the accurate figure) 0.6m approx. 0.6m approx. 

TP3700 GTEC Primary Main T-Bar 0.9m 0.9m 

TC1200 GTEC Cross T-Bar 2.65m or 2 1 /2 Cross T’s 2.65m or 2 1 /2 Cross T’s 

MF2330 


Per 100mm ceiling drop 0.075m 0.1m 

11PHST500 GTEC Pan Head Self Tapping screws 2 off 2 off 

MFCCLEAT GTEC Soffit Cleat 1 off 2 off 

Appropriate Nut & Bolt 1 off 2 off 

GTEC Plasterboard Solutions 1.05m2 2.10m2 

Material Calculator – Lafarge GTEC T-Bar Corridor Ceiling System 

Span Length Drop GTEC Corridor GTEC Edge 

m 2 m m m Span T’s Qty Channels Qty 

18 1.8 10 1 24 8 

19 1.9 10 1 24 8 

20 2.0 10 1 33 8 

Plus for all systems, GTEC jointing materials and GTEC Universal Sealer, GTEC Intumescent Acoustic Sealant to 

ceiling perimeters. 

N.B. This material calculator should only be used as a guide (T-Bar based on rectangular areas) - it may not suit all circumstances. 

Contact Lafarge Technical Enquiryline for further assistance, on Telephone 01275 377789. 


111

Coverages 

Product Pack Size Approximate Coverage per Pack Shelf Life 


GTEC Joint Filler 12.5 kg 25m 2 for filling and bedding only 4 months 

37m 2 as a bedding coat only 4 months 

GTEC Allset Xtra 10 kg 25m 2 for a full taping operation 4 months 

10 kg 47m 2 as a bedding coat only 4 months 

GTEC Joint Cement 25 kg 55m 2 for a full taping operation 6 months 

165m 2 for a finishing coat 6 months 

GTEC Joint Cement Xtra 22.5 kg 64m 2 for a full taping operation 6 months 


GTEC Smartmix 20 kg 45m 2 for a full taping operation 6 months 


GTEC Smartmix Xtra 20 kg 50m 2 for a full taping operation 6 months 


GTEC Deco Joint Cement 20 kg 50m 2 for a full taping operation 6 months 


GTEC Deco Machine 20 kg 50m 2 for a full taping operation 6 months 


GTEC Deco Filler 12.5 kg 25m 2 for filling and bedding only 4 months 

Sealers 

GTEC Universal Sealer 10 litres 100m 2 12 months 

GTEC Drywall Sealer 10 litres 100m 2 (one coat) 12 months 

Adhesives & Renders 

70m 2 (two coats) 12 months 

GTEC Ecoat 25 kg 5m 2 when used as a parge coat render 6 months 

GTEC Universal Bonding Compound 25 kg 8m 2 direct bonded internal walls 5 months 

4m 2 direct bonded external walls 5 months 

GTEC Drywall Adhesive 5 litres 50m 2 12 months 

GTEC Cove Adhesive 12.5 kg 33 linear metres of cove 4 months 

Accessories 

GTEC Intumescent Acoustic Sealant 0.9 litres 

32 linear metres per litre, 

based on 6mm bead 12 months 

0.38 litres 32 linear metres per litre, 

based on 6mm bead 12 months 

GTEC Intumescent Acoustic Sealant 0.6 litres 

32 linear metres per litre, 

(foil refill) based on 6mm bead 12 months 

Storage Notes 

The above products should be stored in dry, well 

ventilated conditions with a minimum temperature of 

5°C. Timber platforms or pallets should be laid to 

keep products clear of the floor. 

Stock to be rotated, using the oldest first. 

The absorption of moisture, by any gypsum based 

powder product, shortens the setting time and may 

reduce its in service strength.

The Installation Handbook - Howarth Timber

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