High Performance Acoustic Insulation Systems - CSR Bradford ...

SOLUTIONS TO MEET BCA SOUND INSULATION PROVISIONS 

BRADFORD GLASSWOOL INSULATION 

THE BLUE BOOK 

BRADFORD ACOUSTISTAR 

High performance acoustic insulation systems

Contents 

New BCA Sound Insulation 

Provisions 1 

Requirements for walls and 

floors for Class 2 or 3 Buildings 

to comply with BCA 2 

Requirements for walls and floors 

for Class 9c (Aged Care Building) 

to comply with BCA 2 

Glasswool or Polyester? 3 

BCA ‘Deemed to satisfy provision’ 

– Bradford basic acoustic solutions 4 

Masonry Walls 4 

Concrete Walls 4 

Autoclaved Aerated Concrete 

(CSR Hebel) Walls 5 

Timber and Steel Frame Walls 6 

Concrete Floors 6 

Autoclaved Aerated Concrete 

(CSR Hebel) Floors 7 

Timber Floors 7 

Services 8 

Schedule of CSR Bradford 

Acoustilag 45 and ceiling 

systems to comply with BCA 

requirements 8 

Internal office insulation 9 

Internal office walls 9 

Bradford Acoustistar systems 10 

Suspended ceilings 12 

Services 12 

Noise problems in homes 12 

Glasswool density 13 

Sustainability 13 

Bradford ComfortSleeve 13 

A quieter work environment means 

higher productivity with less stress. 

A quieter hotel room means a 

happier holiday or business trip. 

A quieter home means better sleep 

patterns and improved family life.

CSR Bradford Insulation 

has more than 70 years’ 

experience in providing 

acoustic insulation 

products and reliable 

system solutions. 

Building designers around the world are 

increasingly recognising the importance 

of improved acoustic performance to 

meet community expectations. 

The Australian Building Codes Board 

introduced changes to the Sound 

Insulation Provisions of the Building 

Code of Australia in May 2004 to reflect 

these expectations of improved building 

acoustic performance. 

Insulation plays a significant role in 

noise control. 

CSR Bradford Insulation has more 

than 70 years’ experience in providing 

acoustic insulation products and reliable 

system solutions. 

This brochure explains how you can 

achieve the optimum solution of 

cheaper, lighter and faster construction 

of internal partitions and party walls to 

meet and exceed the new Building Code 

of Australia (BCA) requirements, using 

Bradford Glasswool Partition Batts, 

Bradford Rockwool SoundScreen 

insulation, and the Bradford 

Acoustistar range. 

For further information on a wider 

range of building systems, refer to the 

CSR Gyprock Red Book. 

New BCA sound 

insulation provisions 

On 1 May 2004, the Building 

Code of Australia (BCA) introduced 

several changes to accommodate 

sound insulation provision. 

These changes include: 

increased protection from airborne 

sound for walls and floors separating 

sole occupancy units (SOUs) 

impact sound insulation for floors 

separating dwellings 

sound protection for water supply pipes, 

ductwork and storm water pipes. 

The new requirements apply to all areas 

of Australia except for Queensland 

and the Northern Territory, which will 

continue to operate under the 

existing regulation. 

The BCA sound provisions will 

apply to all: 

Class 1 buildings (townhouse and 

terrace homes) 

Class 2 buildings (apartments and flats) 

Class 3 buildings (hotels, motels 

and larger boarding houses) 

Class 9c buildings (aged care units). 

Sound provision introduces the Ctr 

value to complement the Rw of the wall. 

(Rw is a single figure rating in decibels for 

airborne sound insulation of a building’s 

elements, e.g. walls, calculated from the 

range of different frequencies tested in a 

laboratory. A higher number means better 

noise insulation capability.) 

This new measure is designed to increase 

protection from the low frequency 

performance of a wall or floor system, and 

has been introduced in response to bass 

frequencies accompanied with 

sub-woofers in home theatres. 

Ctr is a negative number with a typical 

range from –1 to –15, which takes 

into account the characteristics of a 

particular sound spectra. A high negative 

Ctr indicates higher levels of low 

frequency noise penetrating a wall. 

As a result of the new sound insulation 

provisions, instead of stating a wall rating 

as Rw, the provision will now rate a wall 

as Rw + Ctr. For example, using a Ctr 

of (-6), previously a wall may have been 

rated as Rw 50. This will now be rated 50 

+ (-6) which equals 44. The higher the 

value the better performance. 

The term used to describe impact 

sound isolation of a floor is the ‘weighted 

normalised impact sound pressure level’ 

(Ln,w) plus the spectrum adaption 

term (C1). The lower the Ln,w + C1 of 

the floor, the better the impact sound 

performance. 

This new acoustic standard now 

requires a review of insulation 

performance and product choice. 

1

2 


for Class 2 or 3 Buildings to comply with BCA 

Situation 

Walls between habitable* rooms in adjoining units 

Walls between kitchens, toilets, bathrooms, laundries in adjoining units 

Walls between a bathroom, sanitary compartment, laundry or 

kitchen in one SOU from a habitable room (other than a kitchen) in 

an adjoining unit 

Walls separating a unit from a public corridor etc. 

Walls separating a unit from a plant room or lift shaft 

Floors between adjoining units 

Walls/floors separating a duct, soil, waste or water supply pipe from a 

habitable* room 

Walls/floors separating a duct, soil, waste or water supply pipe from a 

kitchen or non-habitable** room 


for Class 9c (Aged Care Building) to comply with BCA 

Situation 

Walls between SOUs 

Walls separating a unit from a kitchen, bathroom, sanitary compartment 

(not being an associated ensuite), laundry, plant room or utilities room 

Floors separating SOUs 

Airborne Sound (Minimum) 

Rw + Ctr = 50 

Rw + Ctr= 50 

Rw + Ctr= 50 

Rw= 50 

Rw= 50 

Rw + Ctr = 50 

Rw + Ctr = 40 

Rw + Ctr = 25 

Airborne Sound (Minimum) 

Rw 45 

Rw 45 

Rw 45 

Impact Sound 

N/A 

N/A 

Walls to be discontinuous 

N/A 


Max Ln,w + C- = 62 

Walls requiring an impact sound insulation rating must have a minimum 20mm cavity between two separate leaves (for a Class 2 or 3 building). For masonry, 

resilient ties must be used. 

Provision has been made for field testing whereby a reduced Rw of 5 can be used. For example, a lab test stated: Rw + Ctr = 50 and the same field test stated: 

DnT,w + Ctr = 45. 

* A habitable room is one used for normal domestic activities and can include the bedroom, living room, lounge room, music room, television room, kitchen, dining 

room, sewing room, study, playroom, family room or sun room. 

** A non-habitable room is a space of a specialised nature occupied neither frequently nor for extended periods, such as the bathroom, laundry, water closet, pantry, 

walk-in wardrobe, corridor, hallway, lobby, photographic darkroom or clothes drying room. 

N/A 

N/A 

Impact Sound 

N/A 


N/A

Glasswool or polyester? 

Acoustic performance 

CSR has undertaken extensive acoustic testing of products 

and systems over many years. 

Recent independent research undertaken by PKA Acoustic 

Consultants has demonstrated the superior performance 

of Bradford Glasswool Partition Batts compared to certain 

commonly specified polyester insulation under the new 

Rw + Ctr criteria in the BCA. 

Note: Tests conducted at Rintoul Acoustic Laboratories by PKA Acoustic 

Consultants, August 2004. Wall system: 13mm CSR Gyprock Fyrchek both 

sides, 64mm separated steel studs at 600mm centres. Polyester products 

tested Autex – ASB2, ASB3, ASB4, ASB5 and Insulation Solutions Pink Poly 

– PP2, PP4. Polyester products were allowed to recover to nominal thickness 

for testing. Repeat tests were conducted and also compared to previous test 

results by CSR Bradford Insulation, CSR Gyprock, CSR Hebel and CSR bricks to 

ensure reliability. 

These results are consistent with theoretical expectations 

given the fundamental differences between Glasswool and 

polyester in terms of bonding, recovery rate, fibre diameter 

– key elements to good acoustic, as well as thermal, insulation 

product performance. 

To further compare Glasswool and polyester products, the 

chart below shows published results of individual product 

acoustic absorption testing to AS1045:1988 ‘Acoustics – 

Measurement of Sound Absorption in a Reverberation Room’ 

across a range of densities. (NB 60mm polyester was used for 

lower densities as no 50mm results were available.) 

NRC 

Specified 

Polyester 

Insulation 

1.2 

1.0 

0.8 

0.6 

0.4 

0.2 

0.0 

8 10 14 15 20 22 

Density 

24 32 35 48 50 

Glasswool 

Rw + Ctr 

Equivalent 

Bradford 

Glasswool 

Partition 

Batts 

Acoustic Absorption Data 50mm Insulation 

Polyester 

Rw + Ctr 

50mm 44 50mm 46 

60mm 44 50mm 46 

70mm 45 50mm 46 

80mm 45 

75mm 47 

50mm 46 

“Based on the test program of separated double stud 

partitions the Glasswool provided markedly superior acoustic 

performance when compared to equivalent and costlier 

polyester insulation configurations. 

The main factor was the cost effectiveness of the wall 

systems. The use of appropriate Glasswool insulation as a 

cavity infill had the potential to significantly reduce the cost 

of the partition wall when high acoustic performance was 

required such as the case with BCA 2004 or the AAAC 

Star Rating System.” 

Peter Knowland, PKA Acoustic Consultants 

Fire performance 

Under the Building Code of Australia there is a general 

requirement for insulation materials to have a Spread of 

Flame Index of 0 and a Smoke-Developed Index of not more 

than 5 or 3 in certain structures of a Class 9a or 9b building. 

Glasswool, rockwool and polyester will achieve these ratings. 

Glasswool and rockwool have the best achievable results of: 

Ignitability = 0, Heating evolved = 0, Spread of Flame = 0, 

Smoke-Developed = 0, when tested AS1530:Part 3. 

All Rockwool and some Glasswool insulation also pass the 

more stringent 1530:Part 1 and in this case, can be classified 

as non-combustible. Polyester and other petrochemical 

based insulation products fail this test. 

Glasswool can be specified with confidence 

Although Glasswool and Rockwool insulation remain the 

world’s most widely used acoustic products, in Australia 

and New Zealand polyester has been used over the past 10 

years following concerns on building sites about the use of 

Glasswool and Rockwool. 

The introduction in 2001 of new formulation FBS-1 

Biosoluble Glasswool and Rockwool in Australia alleviated 

many of these concerns and resulted in agreement being 

reached with key building unions for their safe use on 

Australian building sites. 

A follow-up review of 30 years’ exhaustive scientific and 

medical research findings resulted in the IARC revising 

Glasswool and Rockwool insulation as being not ‘classifiable 

as to carcinogenicity’ in 2002. 

Glasswool and Rockwool insulation are not hazardous and can 

be specified and installed with absolute confidence. 

Bradford products also comply with AS/NZS 4859.1 

for thermal efficiency and quality control. 

FBS-1 GLASS WOOL 

B I O - S O L U B L E I N S U L A T I O N 

3

BCA ‘Deemed to Satisfy provision’ – Bradford basic acoustic solutions 

Listed are the BCA Deemed to Satisfy minimum systems and CSR Bradford Insulation product solutions to meet these 

BCA requirements. 

MASONRY WALLS 

Min. Acoustic Level: Rw + Ctr (not less than) 50 Rw (not less than) 50 

Deemed to Satisfy description 

Two leaves of 110mm clay brick masonry with: 

a) cavity not less than 50mm between leaves; and 

b) 50mm thick Glasswool insulation with a density of 11kg/m3 or 

50mm thick polyester insulation with a density of 20kg/m3 in 

the cavity. 

Single leaf of 110mm clay brick masonry with: 

a) a row of 70mm x 35mm timber studs or 64mm steel studs at 

600mm centres, spaced 20mm from the masonry wall; and 

b) 50mm thick mineral insulation or Glasswool insulation with a 

density of 11kg/m3 positioned between studs; and 

c) one layer of 13mm plasterboard fixed to outside face of studs 

and outside face of masonry. 

Single leaf of 90mm clay brick masonry with: 

a) a row of 70mm x 35mm timber studs or 64mm steel studs at 

600mm centres, spaced 20mm from each face of the masonry 

wall; and 


density of 11kg/m3 positioned between studs in each row; and 

c) one layer of 13mm plasterboard fixed to studs on each 

outside face. 

Construction 

Min. acoustic level: 

Rw + Ctr (not less than) 50 

Rw (not less than) 50 







Bradford Insulation products to meet BCA 

Bradford Glasswool Partition Batts 50mm 

Product Code: 15428 





NB Standard polyester partition insulation, e.g. TSB, ASB density < 10kg/m 3 . Bradford Glasswool Partition Batts 11kg/m 3 . Bradford Rockwool SoundScreen insulation 

30-40kg/m 3 . CSR Bradford Insulation recommends CSR Gyprock plasterboard and CSR PGH bricks be specified and supplied in the above systems. 

CONCRETE WALLS 



100mm thick concrete panel with: 

a) a row of 64mm steel studs at 600mm centres, spaced 25mm 

from the concrete panel; and 

b) 80mm thick polyester insulation or 50mm thick Glasswool 

insulation with a density of 11kg/m3 , positioned between studs; 

and 

c) two layers of 13mm plasterboard fixed to outside face of 

studs and one layer of 13mm plasterboard fixed to outside of 

concrete panel. 



from the concrete panel; and 

b) 70mm polyester insulation with a density of 9kg/m3 positioned 

between studs; and 

c) one layer of 13mm plasterboard fixed to the outside face of 

the studs. 

Construction 










Bradford Glasswool Partition Batts 50mm* 


*Substitute for 70mm polyester 

Acoustic Assessment: PKA A032 

NB Standard polyester partition insulation, e.g. TSB, ASB density < 10kg/m 3 . Bradford Glasswool Partition Batts 11kg/m 3. Bradford Rockwool SoundScreen insulation 

30-40kg/m 3 . CSR Bradford Insulation recommends CSR Gyprock plasterboard and Rinker concrete be specified and supplied in the above systems. 

4

AUTOCLAVED AERATED CONCRETE (CSR HEBEL) WALLS 



75mm thick autoclaved aerated concrete wall panels with: 


from the autoclaved aerated concrete wall panels; and 

b) 75mm thick Glasswool insulation with a density of 11kg/m3 positioned between studs; and 

c) one layer of 10mm moisture resistant plasterboard or 13mm 

fire protective grade plasterboard fixed to outside face of 

autoclaved aerated concrete wall panel. 

75mm thick autoclaved aerated concrete wall panel with: 


from the autoclaved aerated concrete wall panels; and 

b) 28mm metal furring channels fixed to the outside face of 

the autoclaved aerated concrete wall panel, with 50mm thick 

polyester insulation with a density of 9kg/m3 positioned 

between furring channels and one layer of 13mm fire protective 

grade plasterboard fixed to furring channels; and 

c) 105mm thick Glasswool insulation with a density of 7kg/m3 positioned between studs; and 

d) one layer of 13mm fire protective grade plasterboard fixed to 

outside face of the studs. 

Two leaves of 75mm autoclaved aerated concrete wall panels with: 

a) a cavity not less than 30mm between panels containing 50mm 

Glasswool insulation with a density of 11kg/m3 ; and 

b) one layer of 10mm plasterboard fixed to outside face of each 

panel. 

75mm thick autoclaved aerated concrete wall panel with: 

a) one layer of 10mm moisture resistant plasterboard on one face; 

and 

b) 28mm metal furring channels and resilient mounts,75mm 

polyester insulation with a density of 9kg/m3 and 13mm fire 

protective grade plasterboard fixed to the other face. 

Construction 












Bradford Insulation solution to meet BCA 





and 

Bradford Gold R2.0 Glasswool Ceiling Batts 

580mm x 115mm 











30-40kg/m 3 . CSR Bradford Insulation recommends CSR Gyprock plasterboard and CSR Hebel autoclaved aerated concrete be specified and supplied in the above systems. 

5

6 

TIMBER AND STEEL FRAME WALLS 



Two rows of 90 x 35mm timber studs or two rows of 64mm steel 

studs at 600mm centres with: 

a) an air gap not less than 20mm between the rows of studs; and 

b) 50mm thick Glasswool insulation or 60mm thick polyester 

insulation with a density of 11kg/m3 *, positioned between 

one row of studs; and 

c) two layers of 13mm fire protective grade plasterboard or one 

layer of 6mm fibre cement sheet and one layer of 13mm fire 

protective grade plasterboard, fixed to outside face of studs. 

Two rows of 64mm steel studs at 600mm centres with: 

a) an air gap not less than 80mm between the rows of studs; and 

b) 200mm thick polyester insulation with a density of 14kg/m3 , 

positioned between studs; and 

c) one layer of 13mm fire protective grade plasterboard and 

one layer 13mm plasterboard on one outside face and one 

layer of 13mm fire protective grade plasterboard on the other 

outside face. 

One row of 92mm steel studs at 600mm centres with: 

a) 50mm thick Glasswool insulation with a density of 11kg/m3 or 60mm thick polyester insulation with a density of 8kg/m3 , 


b) two layers of 13mm fire protective grade plasterboard or one 

layer of 6mm fibre cement and one layer of 13mm fire protective 

grade plasterboard, fixed to each face. 

One row of 64mm steel studs with: 

a) one layer of 16mm fire protective grade plasterboard fixed to 

one face; and 


density of 11kg/m3 positioned between the studs; and 

c) two layers of fire protective grade plasterboard fixed to the 

other face, the inner layer being 16mm thick and the outer 

layer being 13mm. 

Construction 





















NB *Standard polyester partition insulation, e.g. TSB, ASB density < 10kg/m 3 . Bradford Glasswool Partition Batts 11kg/m 3 . Bradford Rockwool SoundScreen insulation 

30-40kg/m 3 . CSR Bradford Insulation recommends CSR Gyprock plasterboard and CSR Fibre Cement be specified and supplied in the above systems. 

CONCRETE FLOORS 

Min. Acoustic Level: Rw + Ctr (not less than) 50 Ln,w + Ci (not more than) 62 Rw (not less than) 50 


150mm thick concrete slab with: 

a) 28mm metal furring channels and isolation mounts fixed to 

underside of slab, at 600mm centres; and 

b) 65mm thick polyester insulation with a density of 8kg/m3 , 

positioned between furring channels; and 

c) one layer of 13mm plasterboard fixed to furring channels. 

Construction 



Ln,w + Ci (not more than) 62 








30-40kg/m 3 . CSR Bradford Insulation recommends CSR Gyprock plasterboard and Rinker concrete be specified and supplied in the above systems.

AUTOCLAVED AERATED CONCRETE (CSR HEBEL) FLOORS 

Min. Acoustic Level: Rw + Ctr (not less than) 50 Ln,w + Ci (not more than) 62 Rw (not less than) 50 


75mm thick autoclaved aerated concrete floor panels with: 

a) 8mm ceramic tiles with flexible adhesive and waterproof 

membrane, located above the slab; and 

b) timber joists at 600mm centres; and 

c) R1.5 Glasswool insulation positioned between timber joists; and 

d) 28mm metal furring channels and resilient mounts fixed to 

underside of joists; and 

e) two layers of 13mm plasterboard fixed to furring channels. 


19mm thick chipboard floor sheeting with: 

a) 190 x 45mm timber joists at 450mm centres; and 

b) R2.5 Glasswool positioned between timber joists; and 

c) 28mm metal furring channels and isolation mounts fixed 

to underside of joists, isolation mounts to be of natural 

rubber with a dynamic factor of not more than 1.1 and static 

deflection of not less than 3mm at actual operating load; and 

d) two layers of 16mm fire protective grade plasterboard fixed to 

furring channels. 

19mm thick tongued and grooved boards with: 

a) timber joists not less than 175mm x 50mm; and 

b) 75mm thick mineral insulation or Glasswool insulation with 

a density of 11kg/m3 positioned between joists and laid on 

10mm thick plasterboard fixed to underside of joists; and 

c) 25mm thick mineral insulation or Glasswool insulation with a 

density of 11kg/m3 laid over the entire floor, including tops 

of joists before flooring is laid; and 

d) secured to 75mm x 50mm battens; and 

e) the assembled flooring laid over joists, but not fixed to them, 

with the battens lying between the joists. 

Construction 





Construction 








Bradford Gold R1.5 Glasswool 

Wall and Floor Batts 580 x 75mm 



30-40kg/m 3 . CSR Bradford Insulation recommends CSR Gyprock plasterboard be specified and supplied in the above systems. 

TIMBER FLOORS 

Min. Acoustic Level: Rw + Ctr (not less than) 50 Ln,w + Ci (not more than) 62 Rw (not less than) 50 or 45 



Ceiling Batts 580 x 140mm 



Wall and Floor Batts 580 x 75mm 


or 

Bradford Rockwool SoundScreen Batts 75mm 


and 

Bradford Multitel 25mm 




30-40kg/m 3 . CSR Bradford Insulation recommends CSR Gyprock plasterboard be specified and supplied in the above systems. 

7

8 

Services 

Installation 

Measure the circumference of the section being insulated (remembering to add twice the thickness of the Acoustilag to the diameter). 

Add 50mm to 100mm for a lap seam and cut to length. Remove 50mm to 100mm of Glasswool along one edge to provide for the lap. 

After wrapping the lap can be taped using a quality aluminium tape with a four zero fire rating. 

Schedule of CSR Bradford ceiling systems to comply with 

BCA requirements – Rw+Ctr = 25 

Ceiling 

10mm CSR Gyprock 10mm CSR Gyprock Soundchek 10mm CSR Gyprock Soundchek 10mm CSR Gyprock Soundchek 13mm CSR Gyprock Soundchek 13mm CSR Gyprock Soundchek 13mm CSR Gyprock Soundchek 13mm CSR Gyprock 13mm CSR Gyprock 13mm CSR Gyprock * Foil placed upwards. 

Schedule of CSR Bradford ceiling systems to comply with 

BCA requirements – Rw + Ctr = 40 

Ceiling 

13mm CSR Gyprock 13mm CSR Gyprock 10mm CSR Gyprock Soundchek 10mm CSR Gyprock Soundchek 10mm CSR Gyprock Soundchek 13mm CSR Gyprock Soundchek 13mm CSR Gyprock Soundchek 13mm CSR Gyprock 13mm CSR Gyprock Insulation 

75mm Partition Batts 

Nil 








Anticon 55 * 

Insulation 










Pipe wrap 

Nil 

Nil 

Nil 

Nil 

Nil 

Nil 

Nil 

Nil 

Nil 

Nil 

Pipe wrap 

Acoustilag 

Acoustilag 

Acoustilag 

Acoustilag 

Acoustilag 

Acoustilag 

Acoustilag 

Acoustilag 

Acoustilag 

No. of recessed light fittings 

Nil 

Nil 

4 x Halogen 

2 x Halogen 

Nil 

4 x Halogen 

3 x Halogen 

Nil 

2 x Halogen 

3 x Halogen 

No. of recessed light fittings 

Nil 

2 x Halogen 

3 x Halogen 

4 x Halogen 

5 x Halogen 

4 x Halogen 

5 x Halogen 

Nil 

2 x Halogen 

Toilet exhaust grille 

Nil 

Nil 

Nil 

One 

Nil 

Nil 

One 

Nil 

Nil 

One 

Toilet exhaust grille 

Nil 

One 

Nil 

One 

One 

Nil 

One 

Nil 

One

Internal office insulation 

There is a wide range of different noises generated in commercial buildings which are broadly classified as airborne noise 

(via the structure). Airborne noises include speech, computers, fax machines, photocopiers and other office equipment. 

These noises can be a major source of distraction and annoyance to occupants of a building, having an impact on productivity. 

A major source of intrusive noise is through the partition walls, and flanking noise which enters the adjoining office through 

the ceiling void. 

CSR Bradford Insulation have investigated solutions to minimise the discomfort of these noises and help maintain a healthy 

work environment. 

Internal office walls 

Description 

Dry wall 

64mm metal studs, lined with one layer of 13mm Gyprock plasterboard CD each side, with an infill 

of 50mm Bradford Glasswool Partition Batts. 

Bradford Acoustistar insulation 

64mm metal studs, lined with one layer of 13mm Gyprock Soundchek each side, with an infill of 

75mm Bradford Glasswool Partition Batts. 

Verification by site testing 

The on-site testing requirements for Class 2 and 3 buildings appear as Verification Methods. These are lower sound ratings than 

the Deemed to Satisfy requirements because they are on site, not in a laboratory. For elements tested onsite, the airbourne sound 

insulation requirements are as follows: 

Element 

Class 2 and 3 

Floors separating SOUs 

Walls separating SOUs 

Walls separating SOUs from public corridor, lobby, etc. 

Door assembly in a wall separating SOUs from public corridor, lobby, etc. 

For impact sound insulation, the relevant terms are: weighted standardised impact sound pressure level (LnT,w), and spectrum 

adaptation term (C1). LnT,w + C1 is similar to the laboratory term LnT,w + C1. For airbourne sound insulation when tested on site, the 

terms are weighted standardised level difference (DnT,w) and spectrum adaption term (Ctr). DnT,w is similar to laboratory term Rw. 

DnT,w 

45 min. 

25 min. 

Airbourne Sound Impact Sound 

DnT,w + Ctr 

45 min. 

45 min. 

Performance 

Rw 41 

Rw 46 

LnT,w + C1 

62 max. 

Test not specified 

9

10 

Bradford Acoustistar systems 

BCA Deemed to Satisfy Bradford Acoustistar Systems Bradford Acoustistar Plus Systems 

DRY WALL 

Rw + Ctr not less than 50 

Two rows of 64mm steel studs at 600mm 

centres with: 

a) an air gap of not less than 80mm between 

the rows of studs; and 

b) 200mm thick polyester insulation with a 

density of 14kg/m3 mtr, positioned between 

studs; and 

c) one layer of 13mm fire protective grade 

plasterboard and one layer of 13mm 

plasterboard on one outside face and 

one layer of 13mm fire protective grade 

plasterboard on the other outside face. 


MASONRY WALL 



a) a cavity not less than 50mm; and 

b) 50mm thick Glasswool (11kg/m3 mtr) or 

50mm polyester 20kg/m3 mtr) in the cavity. 



centres with: 

a) an air gap of not less than 20mm between 

rows of studs; and 

b) 165mm Bradford Glasswool Partition Batts* 

11kg/m3 plus 50mm Bradford Glasswool 

Partition Batts positioned between studs; 

and 

c) one layer of 13mm Gyprock Fyrchek on 

the send side and 16mm Gyprock Fyrchek on the receive side. 

NAL: ATF report 1740 



a) a cavity of not less than 50mm; and 

b) 50mm thick Bradford Glasswool Partition 

Batts in the cavity. 


Rw + Ctr = 55 

* Bradford Glasswool Partition Batts 165mm provide an excellent and low cost alternative wall system to meet the BCA. 

This new product from Bradford Insulation is available in a standard size of 8.1m x 600mm x 165mm. 


centres with: 

a) an air gap not less than 20mm between 

rows of studs; and 

b) 165mm Bradford Glasswool Partition Batts 

11kg/m3 mtr positioned between studs; and 

c) one layer of 16mm Fyrchek and one layer 

of 10mm Gyprock board CD on one side only 

d) one layer of 16mm Fyrchek and two layers of 

10mm Gyprock board on the other face 


Rw + Ctr = 55 

Single wall of 110mm clay brick with: 

a) 64mm steel studs on both sides, with a 

20mm gap; and 

b) one layer of 13mm Gyprock board CD on 

each face; and 

c) 50mm Bradford Glasswool Partition Batts 

between studs on both sides. 

Acoustic Assessment: PKA A032


CONCRETE WALL 



a) a row of 64mm steel studs at 600mm 

centres, spaced 20mm from the concrete 

panel; and 

b) 70mm polyester insulation with a density of 

9kg/m3 mtr positioned between studs; and 

c) one layer of 13mm plasterboard fixed to the 

outside face of the stud. 





panel; and 

b) 50mm Bradford Glasswool 14kg/m3 Partition 

Batts positioned between studs; and 

d) one layer of 13mm Gyprock plasterboard CD 

fixed to the outer face of the stud. 

NB. Also meets BCA energy efficiency 

R1.8 Total R-Value. 


Rw + Ctr = 60 




panel; and 

b) 75mm Bradford Glasswool Partition Batts 


c) one layer of 13mm Gyprock Soundchek fixed to the outer face of the stud. 

d) one layer of 13mm Gyprock Soundchek fixed to the concrete face. 



AUTOCLAVED AERATED 

CONCRETE WALLS 


75mm thick autoclaved aerated concrete wall 

panels with: 


centres, spaced 20mm from the wall panels; 

and 

b) 75 mm thick Glasswool insulation with a 

density of 11kg/m3 mtr positioned between 

studs; and 

c) one layer of 10mm moisture resistant 

plasterboard or 13mm fire protective grade 

plasterboard fixed to outside face of the 

autoclaved aerated concrete wall panel. 


Two rows of 75mm thick Hebel PowerPanel with: 

a) 500mm gap between panels along each row; 

b) 50mm overlap of panels between the two rows; 

c) 30mm cavity; 

d) 13mm Gyprock Fyrchek attached to each 

outside face; and 

e) Two layers of 50mm Bradford Glasswool 

Partition Batts fitted to cavity and gaps in 

both rows. 

Laboratory Test 

ATF-1888 

For alternative flooring systems refer to the CSR Gyprock Red Book. 

Rw + Ctr = 59 

Two rows of 75mm thick Hebel Powerpanel with: 

a) a 30mm cavity; and 

b) 10mm Gyprock plasterboard CD attached 

to each outside face; and 

c) 50mm Bradford Glasswool Partition Batts 

fitted to cavity. 

Acoustic Opinion: (2001502/1109A/R4/VF) 

Also available from Bradford are Glasswool Partition Batts of 100mm and 105mm thickness to suit specific acoustic 

design performance criteria. 

Please refer to your local Bradford office for more information. 

11

12 

Suspended ceilings 

Services 

Improving sound privacy with Bradford Rockwool or 

Glasswool Ceiling Batts in ceiling space over wall. 

Noise from waste pipes can be treated by the use of Bradford Acoustilag (refer diagram on page 8). 

Noise problems in homes 

Noise in the home can be a major source of annoyance, especially in today’s environment where people are living closer together, 

more open plan house design, and the growth of home theatres. 

Some of the problem areas are: bathrooms, bedrooms, kitchens, laundries, external walls and floors between levels. Some of the 

problem sounds are: music, television, toilets, appliances, footsteps and voices. 

CSR Bradford Insulation have solutions to help minimise these noises to make your home peaceful and comfortable. 

90mm 

Rw 44 

13mm Gyprock Soundchek plasterboard. 

Timber studs min. 70mm at 600mm cts. 

Bradford R2.0 SoundScreen Batts. 

10mm Gyprock Soundchek plasterboard. 

Ducting 

Ducting 

Bradford SoundScreen used in the ceiling space as above 

can stop up to 20dB of noise travelling through the ceiling 

void. Acoustic Assessment: PKA 033. 

Rw 

53 

IIC 

67 

Carpet and underlay. 

19 to 22mm Structaflor particleboard 

flooring. 

Timber joists 240mm at 600mm cts. 


Gyprock resilient mounts and 

RONDO furring channel. 

One layer x 13mm Gyprock 

Soundchek plasterboard. 

Improving sound transmission control through ceiling 

area with Bradford Soundlag curtain. 

100mm 

minimum 

Suspended ceiling 

tiles/plasterboard 

C-track or timber 

batten fixed to soffit 

Bradford Soundlag 

curtain continuous in 

ceiling area 

250mm minimum 

Bradford Soundlag used in the ceiling space as above can 

stop up to 25dB of noise travelling through the ceiling void. 

Acoustic Assessment: PKA 033. 

Internal wall system Floor/ceiling system Exterior wall system 

240mm 240mm 

R 58 

w 

w 

Exterior face brick, 110mm thickness. 

Timber studs 90mm at 600mm cts. 


One layer x 10mm Gyprock 

Soundchek plasterboard.

Glasswool density 

Whilst standard density of Bradford Glasswool Partition 

Batts is 11kg/m 3 some specifications call for 14kg/m 3 . Testing 

conducted by PKA & Associates indicates that whilst Rw is 

improved by the incremental density the overall Rw + Ctr 

remains similar for 11kg/m 3 and 14kg/m 3 . Both densities are 

available from CSR Bradford Insulation. 

Bradford Glasswool Partition Batts 

11kg/m 3 50mm, 75mm, 100mm and 165mm 

14kg/m 3 50mm, 75mm and 100mm 

All products included in Bradford Acoustic Systems in this 

brochure are standard 11kg/m 3 . 

Sustainability 

With increasing pressures on our environment, focus is 

sharpening on ways in which more sustainable products 

can be used. Insulation products are one of the few building 

materials which make a positive contribution to improving 

the environment. 

With Glasswool and Rockwool the ‘embodied energy’ 

is recovered more than 100 times, and in some 

cases 400 times over the lifetime of the product. 

Glasswool manufactured by CSR Bradford Insulation contains 

up to 80% recycled material in the form of waste glass. 

Rockwool contains up to 25% recycled waste products. 

Using these products translates to reductions in the amount of 

fossil fuel burned to generate that energy, and a reduction in 

harmful greenhouse gas emissions. 

Glasswool and Rockwool insulation products are the leading 

choice for sustainable energy conservation worldwide. 

Bradford ComfortSleeve 

A recent survey conducted by CSR Bradford Insulation of 

over 200 commercial contractors and specifiers suggests 

that whilst 74% were aware that Glasswool and Rockwool 

fibres were no longer considered hazardous, many were still 

concerned about possible irritation during installation. 

CSR Bradford Insulation considers its current Glasswool and 

Rockwool production formulations to be low irritant and 

low allergen. Any irritation that may exist during installation 

is mild and easily managed with basic personal protective 

equipment and measures as detailed in our MSDS and 

ICANZ Industry Handbook. 

To further enhance the ease of installation of Bradford 

Glasswool and Rockwool we are pleased to introduce a major 

international innovation – Bradford ComfortSleeve . 

For the first time the insulation industry has a purpose built 

glove for installing insulation. CSR has a design patent on this 

invention – unique to CSR Bradford Insulation. 

13

ADMBI160-246 

FOR MORE INFORMATION 

For more information or to contact your nearest 

CSR Bradford distributor call 1800 354 044 or 

visit www.bradfordinsulation.com.au 

CSR Bradford Insulation 

55 Stennett Rd, Ingleburn NSW 2565 Australia 

Telephone (02) 9765 7000 Facsimile (02) 9765 7002 

CSR Bradford Insulation is a business division of 

CSR Building Products Limited ABN 55 008 631 356 

THE BLUE BOOK

High Performance Acoustic Insulation Systems - CSR Bradford ...

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