Aco Fulbora watertight rainwater outlets for flat roofs and ... - CMS

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Certificate Certificate No. No. 

No. 

FM13502 

FM13502 

CI/Sfb (52.4) XFV9 

ACO fulbora 

Rainwater engineering 

ACO ACO ACO Fulbora Fulbora watertight watertight rainwater rainwater outlets outlets for for flat flat rr 

roofs r oofs and 

and 

Product Catalogue and Specifiers Design Guide - 2 nd Edition 

May 2004 

1

2 

ACO fulbora 


ACO Fulbora 

ACO Fulbora is a division of the ACO Group. The Group has 

sales in excess of £250 million worldwide with production 

facilities in 12 countries including the UK, Germany, USA, 

France, Switzerland, Denmark, Australia and the Czech 

Republic. In total more than 2500 people are employed in 

27 countries throughout the world. 

ACO Fulbora, based in Shefford, Bedfordshire, UK, 

specialises in floor drains, channels, gullies, grease traps 

and rainwater outlets manufactured from stainless steel, 

polypropylene, galvanised steel, aluminium alloy, nickel 

bronze and gun metal. 

Our modern, state of the art manufacturing plant 

produces high quality products which have been used in 

many hundreds of projects both in the UK and overseas. 

We operate a quality system in accordance with 

ISO 9001:2000. 

We aim to provide our customers with optimum solutions 

and optimum support. Our qualified in-house engineers can 

offer detailed technical advice and product information. 

Purpose written CAD software enables us to provide 

specifiers and end users with a no obligation design service 

aimed at providing the optimum solution to drainage 

problems. A team of experienced Area Sales Engineers is 

available to give expert advice wherever and whenever 

required. 

ACO Fulbora’s comprehensive range of engineered 

rainwater products is particularly suitable for all types of 

flat roof and low pitched commercial and industrial roofing 

applications. 

Other products available from the ACO Fulbora portfolio 

include linear and point drainage systems together with a 

wide range of grease traps and interceptors for use in 

industrial/commercial kitchens, food processing plants, 

abattoirs, brewing/bottling plants, hospitals, hotels, 

restaurants, chemical and pharmaceutical plants and 

leisure facilities - anywhere in fact that requires hygienic and 

corrosion resistant drainage products of the highest quality.

Introduction 

Flat Roofs 

Over the past few years, there have been 

major advances and improvements in the 

materials used in modern roofing 

technology. The specifier now has 

renewed confidence to take full 

advantage of the benefits of a flat roof 

and low pitched roof design concept. 

Flat roofs allow greater planning and 

design flexibility - roof-top gardens, 

terracing, patios, car parks, building 

services and ventilation equipment, 

delivery areas and provision for adding 

additional storeys at a later date. All can 

be accommodated in a flat roof design. 

Extensive or irregular shaped buildings 

can be roofed more quickly, easily and 

cost effectively than a pitched roof. 

Internal condensation is less of a risk 

because a flat roof uses less airspace 

than a pitched roof. In addition, the need 

to heat and illuminate voids is eliminated. 

Flat roofs allow easy access to natural 

light and because of the simple 

construction, internal partitioning is easy. 

This is especially advantageous for 

commercial or industrial buildings. 

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tical tical tical spigot spigot spigot spigot spigot rainwater rainwater rainwater rainwater rainwater 

outlets. outlets. outlets. outlets. outlets. 

The Need for Rainwater Outlets 

Any flat area needs careful design to 

ensure efficient removal of surface water. 

Traditionally, water from a flat roof or 

other structure is channelled by way of a 

slope to a rainwater pipe. Leaks can often 

occur at the junction of the membrane 

and the rainwater pipe. 

To overcome this potential problem, 

ACO Fulbora rainwater outlets provide a 

watertight joint between the membrane 

and the outlet by mechanically clamping 

the membrane to the sump unit. Tried and 

tested for over 40 years, ACO Fulbora 

outlets have been used successfully on all 

types of flat roof construction. 

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ACO fulbora 


Contents 

Hydraulic Design 

Considerations 

Overview 4 

Geographical Location 4 

Flow Rate Calculation 4 

Effective Catchment Area of Roofs 5 

Practical Design Tips 6 

Product Ranges 

Mk 3 Range & Accessories 7 

HP (High Performance) Range 

& Accessories 11 

FreeDeck Drainage System 27 

Architectural Eaves Treatments 33 

Appendices 

Material Selection 36 

Typical Roof Construction Detail 38 

Installation Guidelines 43 

Flexible Pipe Couplings 45 

3 

Introduction

Design Considerations 

4 

ACO fulbora 


Hydraulic Design Considerations 

Overview 

The following notes are intended as a 

guide to the specifier who is designing a 

rainwater drainage system for a roof. It is 

recommended that reference is made to 

British Standard BS EN 12056 : 2000 

Gravity Drainage Systems Inside 

Buildings - Part 3 : Roof drainage, layout 

and calculation for a comprehensive 

design guide. 

For any rainwater drainage system to 

work effectively and reliably, due account 

must be taken of the following 

considerations: 

■ Geographical location 

■ Rainfall intensity 

■ Effective catchment area of roof 

■ Risk category of building 

■ Hydraulic capacity of the drainage 

system(s) employed 

Geographical Location 

Rainfall intensity has a direct impact on 

the performance requirements of any 

rainwater drainage system. For roofs and 

paved areas, it is normally impracticable 

to guard against very infrequent, 

extremely heavy rainfall situations and so 

the designer should aim to strike a 

balance between the cost of the drainage 

system, the risk category of the building 

and the frequency and subsequent 

consequences of flooding. 

The drainage system for roofs and paved 

areas should be capable of coping with 

the intense rainfall that accompanies 

summer thunderstorms. 

The UK experiences complex and varied 

rainfall patterns. For example, surprisingly, 

although the upland areas of northern and 

western parts of the British Isles 

experience higher average annual rainfall 

than the lowland areas, the lowland areas 

experience more frequent and more 

intense short duration rainfall than the 

upland areas. British Standard BS EN 

12056 : 2000 may be referred to for 

further information and guidance on this 

topic. 

A rainfall intensity of 75 mm/hr (0.02 l/s/ 

m 2 ) is used throughout this design 

catalogue. 

Flow Rate Calculation 

The flow rate Q, from roofs, paved areas 

and vertical walls and surfaces is 

calculated as follows and assumes that all 

surfaces are impermeable: 

Q = A x I litres/second 

3600 

where 

Q = Volumetric flow rate (l/s) 

A = Effective catchment area (m²) 

I = Rainfall intensity (75 mm/hr)

Effective Catchment Area of Roofs 

Pitched Roofs 

The effective catchment area of a freely 

exposed pitched roof draining to an eaves 

or parapet wall gutter is equal to the plan 

area of the roof plus half its maximum 

elevation area. 

Catchment Area A = (f x l) + (g/2 x l) (m²) 

= l(f + g/2) (m²) 

All linear dimensions in metres. 

Figure Figure Figure Figure Figure 1. 1. 1. 1. 1. Pitched Pitched Pitched Pitched Pitched Roof Roof Roof Roof Roof 

Flat Roofs & Paved Areas 

For a monopitch flat roof or paved area 

with a freely exposed horizontal surface, 

the effective catchment area is equal to 

the plan area of the area to be drained as 

shown below: 

For a flat roof with a dual pitch, split the 

roof up into discrete areas to isolate the 

catchment areas as follows: 

ACO fulbora 


Catchment Area B = a x b (m²) 


Figure Figure Figure Figure Figure 2. 2. 2. 2. 2. Monopitch Monopitch Monopitch Monopitch Monopitch Flat Flat Flat Flat Flat Roof Roof Roof Roof Roof 

Catchment Area C = c x d (m²) 

Catchment Area D = c x e (m²) 


Figure Figure Figure Figure Figure 3. 3. 3. 3. 3. Dual Dual Dual Dual Dual Pitch Pitch Pitch Pitch Pitch Flat Flat Flat Flat Flat Roof Roof Roof Roof Roof 

5 

Design Considerations

Design Considerations 

6 

ACO fulbora 


Effective Catchment Area of Roofs 

Flat Roofs & Paved Areas with Adjacent Vertical Surfaces 

Flat roofs or paved areas that are 

adjacent to vertical walls and/or glazed 

surfaces will be subjected to an increased 

hydraulic load due to the effects of wind 

driven rain against these vertical surfaces 

and subsequently running off onto the 

roof. 

For a flat roof exposed to a single wall as 

shown in Figure 4, assume the effective 

catchment area to be half the exposed 

vertical area of the wall and is shown as 

follows: 

From Figure 2, Catchment Area B = a x b (m²) 

Vertical Wall Catchment Area E = a x H/2 (m²) 

Total Catchment Area = (a x b) + (a x H/2) (m²) 


Figure Figure Figure Figure Figure 4. 4. 4. 4. 4. Monopitch Monopitch Monopitch Monopitch Monopitch Flat Flat Flat Flat Flat Roof Roof Roof Roof Roof with with with with with One One One One One 

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Practical Design Tips 

When designing an engineered rainwater 

scheme, the following design hints are 

suggested: 

■ Do not design for the maximum outlet 

hydraulic capacity, allow a 10% factor 

of safety margin for intense storms 

and leaf/debris blockage. 

Roof Catchment Area B = a x b (m²) 

Similarly, for a flat roof exposed to two or 

more vertical walls forming an angle or 

bay, the assumed resulting wind direction 

requires that the combined areas of the 

walls should be considered together as 

follows: 

Vertical Wall Catchment Area E = a x H/2 (m²) 

Vertical Wall Catchment Area F = b x h/2 (m²) 

Total Catchment Area = (a x b) + ½√ (E²+ F² - 2F x Cos θ) (m²) 

All linear dimensions in metres; angles in degrees. 

Figur Figur Figure Figur Figure 

e e e 5 5 5 5 5 Monopitch Monopitch Monopitch Monopitch Monopitch Flat Flat Flat Flat Flat Roof Roof Roof Roof Roof with with with with with TT 

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■ Always allow for a back-up outlet, 

even though only one outlet may be 

required. 

■ Rainwater outlets should be inspected 

and cleaned at least every 6 months 

to ensure reliable and continuous 

operation.

ACO fulbora 


Mk 3 Range 

The ACO Fulbora Mk 3 range of vertical 

spigot rainwater outlets feature a unique 

quick action twist release dome grate, 

providing fast and convenient 

maintenance. 

The twist action eliminates the need for 

central hook bolts/nuts or clamping bolts 

that can be lost or mislaid during 

maintenance visits. No tools are required 

to remove the dome grate. 

The ACO Fulbora Mk 3 range provides a 

cost effective, high quality solution for 

vertical spigot rainwater drainage. 

A wide range of vertical spigot outlets are 

available: 50 mm, 75 mm, 100 mm and 

150 mm. 

Mk 3 Range 

Description 8 

Mk 3 Range Accessories 10 

Appendices 





Mark 3 Range 

Mk 3 Range

Mk 3 Range 

8 

ACO fulbora 


Mk 3 Range 

Description 

The ACO Fulbora Mk 3 range of vertical 

spigot rainwater outlets provide a reliable, 

watertight and convenient solution for flat 

roof drainage applications. 

Mk Mk Mk Mk Mk 3 3 3 3 3 rainwater rainwater rainwater rainwater rainwater outlet outlet outlet outlet outlet range. range. range. range. range. 

The dome grating attaches to the body 

via a unique twist action that enables fast 

and convenient removal and replacement 

without the need for any tools. 

All products are manufactured from LM6 

grade aluminium alloy to BS 1490 as 

standard for optimum corrosion 

resistance. 

Product Features 

■ Durable, corrosion resistant 

construction. 

■ Convenient twist action dome grate - 

no tools required. 

■ Quick, easy maintenance. 

■ High flow rates. 

■ Optional PVC collar for solvent & heat 

welded single ply membranes. 

■ Gun-metal optionally available. 

The roof membrane is positively secured 

into the outlet body by a clamp that is 

serrated on the underside ensuring the 

membrane is clamped evenly and reliably. 

The unit ensures the integrity of the seal 

between the clamp and body is not 

disturbed when the grating is removed for 

maintenance during the life of the 

installation. The clamp is secured by 

either 2 or 4 stainless steel fixings 

depending upon the size of outlet. 

A range of raising ring accessories are 

available to raise the grating above the 

level of insulation or surrounding surface. 

Raising rings are simply added by the 

same twist action associated with the 

dome grating. 

Mk Mk Mk Mk Mk 3 3 3 3 3 rainwater rainwater rainwater rainwater rainwater outlets outlets outlets outlets outlets with with with with with raising raising raising raising raising rings rings rings rings rings 

attached. attached. attached. attached. attached. 

Options 

■ Gun-metal Gun-metal to BS EN 1982 : 199 

available to special order. Gun-metal 

should be specified for use in 

conjunction with copper or lead-clad 

roofs or when connected to copper 

pipes. Refer to Appendix 1 for 

further information. Suffix Sales 

Code with ‘GM’ for this option for 

example, 4Mk3-D GM. 

■ Optional Optional rigid rigid PVC PVC ring ring supplied 

bonded to body flange to facilitate 

solvent/heat welding of high 

performance, single ply roofing 

membranes. Suffix Sales Code with 

‘PVC’ for this option for example, 

6Mk3-D PVC. 

■ Gratings Gratings and and clamp clamp clamp rings rings can be 

provided to suit corporate colour 

schemes and coding as required. 

For further details of any options, 

contact the ACO Fulbora Sales Desk for 

more information.

Mk 3 Range Vertical Spigot Dome Grate - Product Selector 

Technical Information 

ACO fulbora 


Sales Code Nominal Bore Grating Flow Rate† Area Drained‡ Weight 

Pipe Size (mm) Type (l/s) (m 2 ) (kg) 

2Mk3-D 50 Dome 1.7 81 2.2 

3Mk3-D 75 Dome 5.0 240 2.3 

4Mk3-D 100 Dome 10.7 514 4.1 

6Mk3-D 150 Dome 12.4 590 4.6 

† Based on a 35 mm head of water over the outlet body. ‡ Based on a rainfall intensity of 75 mm/hr. Flow rates based on BS EN 12056 : 2000. 

Physical Dimensions 

Dimension 2Mk3-D 3Mk3-D 4Mk3-D 6Mk3-D 

A 292 292 381 381 

B 230 230 321 321 

C 195 195 247 247 

D 105 120 120 120 

E 60 84 110 160 

All dimensions in mm. 

9 

Mk 3 Range

Mk 3 Range 

ACO fulbora 

Rainwater engineering

ACO fulbora 


HP (High Performance) 

Range 

The extensive range of products included 

in the ACO Fulbora HP (High Performance) 

range of outlets provides rainwater 

drainage solutions for a wide range of 

applications. 

Key features of this high quality product 

range include advanced grating geometry 

increasing the flow of water through the 

outlet compared to conventional units and 

secure gratings to prevent vandalising 

and theft. 

The ACO Fulbora HP range provides a 

high performance, cost effective, high 

quality solution for most rainwater 

applications. 

A wide range of outlet sizes and 

configurations are available: 50 mm, 

75 mm, 100 mm and 150 mm. 

HP Range 

Description 12 

HP Vertical Spigot Outlet 15 

HP Vertical Screw Outlet 17 

HP 45° Spigot Outlet 18 

HP 90° Spigot Outlet 19 

HP Balcony Spigot Outlet 20 

HP Two-Way Screw Outlet 21 

HP Gully Spigot Outlet 22 

HP Refurbishment Outlet 23 

HP Accessories 24 

Appendices 





HP Range

HP Range 

12 

ACO fulbora 


HP Range 

Description 

The ACO Fulbora HP range of rainwater 

outlets provides a comprehensive 

selection of high performance rainwater 

outlet solutions for most domestic, 

industrial and commercial applications 

involving flat roofs, balconies and terracing. 

High Flow Rate 

Advanced design features encourage a 

higher flow rate of water through the 

outlet compared to conventional systems 

by reducing the amount of air that is 

drawn into the outlet. If allowed to go 

unchecked, a vortex will form as the 

water enters the outlet - the same effect 

can be seen in the bath or a sink when 

the plug is removed. 

Product Features 

■ Cost effective drainage solution - high 

flow rates minimises number of 

outlets required. 

■ Secure grating to prevent vandalism 

and theft. 

■ Comprehensive product range for 

most applications. 

■ Durable, corrosion resistant 

construction. 

■ Gun-metal optionally available. 

At the centre of the vortex, a void is 

naturally formed as the water spirals 

through the outlet. Under these 

conditions, both water and air are drawn 

into the outlet significantly reducing 

efficiency. For maximum flow rate 

efficiency, only water should enter the 

outlet. This may result in the use of fewer 

outlets for a given installation. 

The ACO Fulbora HP range of outlets 

provide anti-vortex design features to 

minimise this effect and a twofold design 

approach is adopted to achieve this. On 

all circular domed gratings an inverted 

cup arrangement is integrated within the 

grating to breakdown the vortex effect 

within the grating and in addition, the leaf 

guard geometry of the gratings is 

optimised to encourage water to flow 

radially into the outlet, thereby minimising 

the vortex effect outside of the grating. 

Reduced Installation Costs 

Compared to conventional outlets, high 

performance outlets mean either fewer 

outlets/pipe/groundworks with reduced 

installation costs, or greater security in 

extreme rainfall conditions. 

Secure Gratings 

All gratings for the HP range of products 

are secured with stainless steel fixings 

that require either a socket wrench or 

spanner for removal and replacement. 

This provides additional security to 

prevent theft or vandalism.

Membrane Clamp 

The roof membrane is positively secured 

into the outlet body by a clamp and is 

secured by 2 stainless steel fixings. The 

membrane clamp is serrated on the 

underside for improved membrane clamp 

grip performance. The outlet design 

ensures the integrity of the seal between 

the clamp and body is not disturbed when 

the grating is removed for maintenance 

during the life of the installation. 

Materials 

All products are manufactured from LM6 

grade aluminium alloy to BS 1490 as 

standard for optimum corrosion 

resistance. 

HP Range Accessories 

A wide range of accessories are available 

for the ACO Fulbora HP range including 

raising rings, PVC connectors, terrace 

grates and deck support plates. See 

Pages 24-26 for details. 

Pipe Connections 

Refer to Appendix 4 for details of the full 

range of flexible pipe connection 

couplings that are available from 

ACO Fulbora. 

ACO fulbora 


Options 

■ Gun-metal to BS 1400 available to 

special order. Gun-metal should be 

specified for use in conjunction with 

copper or lead-clad roofs or when 

connected to copper pipes. Refer to 

Appendix 1 for further information. 

Suffix Sales Code with ‘GM’ for this 

option for example, 2HP-D GM. 

■ Gratings and clamp rings can be 

provided to suit corporate colour 

schemes and coding as required. 

For further details of any options, contact 

the ACO Fulbora Sales Desk for more 

information. 

13 

HP Range

HP Range 

14 

ACO fulbora 


HP Range Product Selector 

HP Vertical Spigot Outlet 

General purpose rainwater outlets 

suitable for direct connection to cast iron 

pipework to BS 416 : 1983/EN 877 or to 

PVC ‘O’-ring socket pipe to BS 4514 : 

1983. Other connections can be made 

using ACO Fulbora flexible couplings or 

heat shrink sleeving. Vertical spigot 

outlets are available with either domed or 

flat gratings. Flat gratings are used where 

either vehicles or pedestrian traffic is 

likely. 

HP Vertical Screw Outlet 

Screwed outlets are recommended where 

connection to the outlet occurs within the 

thickness of the slab and threaded 

connections will form a completely gastight 

seal. 

Vertical screw outlets have a female 

parallel thread to BS 21 : 1985 for 

connecting directly to tubes conforming 

to BS 1387 : 1985 which is supplied with 

a taper male thread. This ensures a 

completely watertight seal when screwed 

fully home into the outlet body. A range of 

PVC adaptors are available from ACO 

Fulbora to allow connection to aluminium 

pipework, socketed and socketless cast 

iron pipework and PVC pipework. 

HP 45° & 90° Spigot Outlets 

These angled problem solving units are 

particularly relevant to suit more complex 

pipe run detail. Pipework connections as 

per vertical spigot details. 

HP Balcony Spigot Outlet 

The balcony outlet provides discrete safe 

drainage for balconies and walkways. 

Supplied complete with a D-shaped flat 

grating, the outlet can be installed against 

a wall. The grating is supplied with holes 

to receive either 50 mm, 75 mm or 

100 mm nominal bore rainwater 

downpipes. These are easily cut on site to 

suit the application. 

HP Two-Way Screw Outlet 

The two-way outlet is designed to be used 

at the junction of roofs and parapet walls, 

or wherever a horizontal and vertical 

surface meet. Available to fit pipe sizes of 

50 mm, 75 mm and 100 mm. This 

flexible design of outlet allows either 

horizontal or vertical outflow take-off. 

Pipework connections as per vertical 

screw details. 

HP Gully Spigot Outlet 

The gully outlet is designed to fit into 

valley gutters and is supplied with a 

vertical spigot outlet and dome grating. 

Pipework connections as per vertical 

spigot details. 

HP Refurbishment Outlet 

When an existing flat roof is being 

upgraded, the refurbishment outlet is 

designed to fit inside the existing outlet 

and pipework with minimal disruption 

without the need to remove the original 

outlet. The aluminium body incorporates a 

wide fixing flange to enhance the bond 

with roofing membranes and does not 

suffer the distortion effects during the 

application of torched membranes. 

Outlets are supplied with a flexible finned 

pipe seal ensuring a watertight 

connection to existing pipework. The ease 

of use and minimal disruption to the 

existing rainwater system makes this an 

extremely cost effective solution when 

upgrading flat roofs.

HP Vertical Spigot Outlet, Dome Grate - Product Selector 


ACO fulbora 




2HP-D 50 Dome 1.7 81 2.39 

3HP-D 75 Dome 5.0 240 2.49 

4HP-D 100 Dome 10.7 514 4.23 

6HP-D 150 Dome 14.1 675 4.67 



Dimension 2HP-D 3HP-D 4HP-D 6HP-D 

A 292 292 380 380 

B 233 233 305 305 

C 196 196 244 244 

D 98 108 122 145 

E 60 83 110 160 


Pipework Connections 

Vertical spigot outlets may be directly 

connected to the following: 

■ Cast iron pipework to BS 416:1973 

or EN 877. 

■ PVC ‘O’-ring socketed pipe to 

BS 4514 : 1985 (for 3HP-D, 4HP-D 

and 6HP-D outlets only). 

■ Connection to 2HP-D units via heat 

shrink socket or pipe couplings. 

Refer to Appendix 4 for details of pipe connection couplings that are available. 

Specification Clause 

The rainwater outlets 2HP-D/3HP-D/ 

4HP-D/6HP-D* are to be ACO Fulbora 

HP vertical spigot outlets with locked 

dome grating supplied by ACO Fulbora 

(a division of ACO Technologies plc), of 

Hitchin Road, Shefford, Bedfordshire, UK, 

SG17 5TE. 

All components to be manufactured from 

grade LM6 aluminium alloy to BS 1490/ 

gun-metal to BS EN 1982*. 

All components used within the scope of 

this system are shown on Drawing 

No. * and all work shall be 

carried out strictly in accordance with the 

manufacturers instructions and the 

installation details are set out on Drawing 

No. *. 

* please delete or complete as appropriate. 

15 

HP Range

HP Range 

16 

ACO fulbora 


HP Vertical Spigot Outlet, Flat Grate - Product Selector 




2HP-F 50 Flat 1.7 81 2.51 

3HP-F 75 Flat 5.0 240 2.65 

4HP-F 100 Flat 10.7 514 4.08 

6HP-F 150 Flat 15.6 749 4.39 



Dimension 2HP-F 3HP-F 4HP-F 6HP-F 

A 292 292 380 380 

B 233 233 305 305 

C 196 196 244 244 

D 98 108 122 145 

E 60 83 110 160 



Vertical spigot outlets may be directly 



or EN 877. 


BS 4514 : 1985 (for 3HP-F, 4HP-F 

and 6HP-F outlets only). 

■ Connection to 2HP-F units via heat 




The rainwater outlets 2HP-F/3HP-F/ 

4HP-F/6HP-F* are to be ACO Fulbora 

HP vertical spigot outlets with locked flat 

grating supplied by ACO Fulbora 



SG17 5TE. 










No. *. 

* please delete or complete as appropriate.

HP Vertical Screw Outlet, Dome Grate - Product Selector 


ACO fulbora 




2HP-TD 50 Dome 1.7 81 2.29 

3HP-TD 75 Dome 5.0 240 2.32 

4HP-TD 100 Dome 10.7 514 4.03 

6HP-TD 150 Dome 13.5 648 4.13 



Dimension 2HP-TD 3HP-TD 4HP-TD 6HP-TD 

A 292 292 380 380 

B 234 234 305 305 

C 121 121 133 114 

D 35 45 38 38 



Vertical screw outlets have a female 

parallel thread to BS 21 : 1985 for 

connecting directly to tube conforming 

to BS 1387 : 1985 which is supplied 

with a taper male thread. This ensures a 

completely watertight seal when 

screwed fully home into the outlet body. 

Screwed outlets are recommended 

where connection to the outlet occurs 

within the thickness of the slab and 

threaded connections will form a 

completely gas-tight seal within the slab. 

Refer to HP Accessories section for details of PVC adaptors that are available from 

ACO Fulbora. 


The rainwater outlets 2HP-TD/3HP-TD/ 

4HP-TD/6HP-TD* are to be ACO Fulbora 

HP vertical screw outlets with locked 

dome grating supplied by ACO Fulbora 



SG17 5TE. 










No. *. 


17 

HP Range

HP Range 

18 

ACO fulbora 


HP 45° Spigot Outlet, Dome Grate - Product Selector 




245HP-D 50 Dome 1.7 81 3.34 

345HP-D 75 Dome 5.0 240 3.77 

445HP-D 100 Dome 10.7 514 4.81 



Dimension 245HP-D 345HP-D 445HP-D 



45° spigot outlets may be directly 


A 305 305 372 

B 229 229 305 

C 229 235 273 

D 175 175 191 

E 62 87 114 


or EN 877. 

■ Connection to PVC pipework via heat 





445HP-D* are to be ACO Fulbora 

HP 45° spigot outlets with locked dome 




SG17 5TE. 










No. *. 


HP 90° Spigot Outlet, Dome Grate - Product Selector 


ACO fulbora 




290HP-D 50 Dome 1.7 81 3.57 

390HP-D 75 Dome 3.5 171 3.61 

490HP-D 100 Dome 7.0 336 4.69 



Dimension 290HP-D 390HP-D 490HP-D 



90° spigot outlets may be directly 


A 305 329 405 

B 229 229 305 

C 124 121 142 

D 232 267 285 

E 62 83 110 


or EN 877. 


BS 4514 : 1985 (for 390HP-D and 

490HP-D outlets only). 

■ Connection to 290HP-D via heat 





490HP-D* are to be ACO Fulbora 

HP 90° spigot outlets with locked dome 




SG17 5TE. 










No. *. 


19 

HP Range

HP Range 

20 

ACO fulbora 


HP Balcony Spigot Outlet, Flat Grate - Product Selector 




2HP-BO 50 Flat 1.7 81 2.58 

3HP-BO 75 Flat 5.0 240 2.71 

4HP-BO 100 Flat 8.4 403 2.77 



Dimension 2HP-BO 3HP-BO 4HP-BO 



Balcony outlets may be directly 


A 270 270 270 

B 205 205 205 

C 52 52 52 

D 125 125 125 

E 235 235 235 

F 180 180 180 

G 60 83 110 


or EN 877. 


BS 4514 : 1985 (for 3HP-BO and 

4HP-BO outlets only). 

■ Connection to 2HP-BO units via heat 




The rainwater outlets 2HP-BO/3HP-BO/ 

4HP-BO* are to be ACO Fulbora 

HP Balcony spigot outlets with locked flat 




SG17 5TE. 










No. *. 


HP Two-Way Screw Outlet, Flat Grate - Product Selector 


ACO fulbora 




Vertical Horizontal Vertical Horizontal 

Outflow Outflow Outflow Outflow 

2HP-2W 50 Flat 1.7 1.7 81 81 2.14 

3HP-2W 75 Flat 3.9 1.9 189 93 2.22 

4HP-2W 100 Flat 6.0 2.3 288 110 2.23 



Dimension 2HP-2W 3HP-2W 4HP-2W 

A 204 204 204 

B 70 70 70 

C 191 191 191 

D 214 214 214 

E 50 50 50 

F 45° 45° 45° 

Overall Length 225 255 255 



Two Way outlets have a female parallel 

thread to BS 21 : 1985 for connecting 

directly to tube conforming to BS 1387 : 

1985 which is supplied with a taper male 

thread. This ensures a completely 

watertight seal when screwed fully home 

into the outlet body. 

Screwed outlets are recommended where 

connection to the outlet occurs within the 

thickness of the slab and threaded 

connections will form a completely gastight 

seal within the slab. 

Refer to HP Accessories section for 

details of PVC adaptors that are available 

from ACO Fulbora. 


The rainwater outlets 2HP-2W/3HP-2W/ 

4HP-2W* are to be ACO Fulbora 

HP Two-Way screw outlets with locked flat 




SG17 5TE. 










No. *. 


21 

HP Range

HP Range 

22 

ACO fulbora 


HP Gully Spigot Outlet, Dome Grate - Product Selector 




3HP-GO 75 Dome 5.0 240 3.89 

4HP-GO 100 Dome 10.4 500 4.02 




Gully outlets may be directly connected 

to the following: 


or EN 877. 

Dimension 3HP-GO 4HP-GO 

A 228 228 

B 188 188 

C 251 251 

D 130 130 

E 83 110 

Overall Length 334 334 



BS 4514 : 1985. 



The rainwater outlets 3HP-GO/4HP-GO* 

are to be ACO Fulbora HP Gully outlets 

with locked dome grating supplied by 

ACO Fulbora (a division of ACO 

Technologies plc), of Hitchin Road, 

Shefford, Bedfordshire, UK, SG17 5TE. 










No. *. 


HP Refurbishment Outlet - Product Product Product Selector 

Selector 


ACO fulbora 




3HP-RFO 75 Dome 5.0 240 5.00 

4HP-RFO 100 Dome 5.00 240 5.10 




Refurbishment outlets are designed to 

fit the following range of existing 

pipework systems: 

■ 3HP-RFO : 71.5 to 78.5 mm internal 

pipe diameter. 

Dimension 3HP-RFO 4HP-RFO 


A 456 456 

B 304 304 

C 346 346 

D 266 266 

E 63.5 88.9 

F 95 120 

G 205 205 

■ 4HP-RFO : 97.0 to 104.0 mm internal 

pipe diameter. 


The rainwater outlets 3HP-RFO/4HP-RFO* 

are to be ACO Fulbora HP Refurbishment 

outlets with locked dome grating supplied 

by ACO Fulbora (a division of ACO 

Technologies plc), of Hitchin Road, 

Shefford, Bedfordshire, UK, SG17 5TE. 










No. *. 


23 

HP Range

HP Range 

24 

ACO fulbora 


HP Range Accessories 

A wide range of accessories is available 

for the ACO Fulbora HP range of 

rainwater outlets allowing easy installation 

in common and not so common 

applications of roof construction, 

including warm and inverted roofs, 

terraces and concealed outlets under 

raised paving slabs. 

Raising Rings 

Raising rings are used where it is 

necessary to raise the level of the dome 

grating above the outlet body, for 

example an inverted roof construction. 

With the exception of the Balcony Outlets 

(HP-BO) and Gully Outlets (HP-GO), raising 

rings will only accept dome gratings or 

Terrace Grates as the raising rings will 

not accept the standard flat grates. 

Raising rings are easily cut with a 

hacksaw on site if required to match 

installation requirements, i.e. to suit 

paving slabs. Stainless steel extension 

fixings are supplied with each raising ring. 

Raising rings are also available for 

Balcony Outlets and Gully Outlets. All 

raising rings are manufactured from LM6 

aluminium alloy to BS 1490 and are 

optionally available in gun metal to 

BS 1400. Suffix sales code with ‘GM’ for 

this option. 

PVC Adaptors 

PVC adaptors are available for threaded 

outlets - HP Vertical Screw (HP-TD); and 

HP Two-Way (HP-2W) systems. PVC 

adaptors provide a quick and convenient 

connection to standard PVC pipework. 

The adaptors are suitable for connection 

to all types of pipe systems including cast 

iron socketed or socketless systems and 

are assembled using PTFE tape to ensure 

a watertight connection. Manufactured 

from tough PVC-u, the adaptors are 

supplied with a male thread and 

chamfered spigot for easy connection to 

PVC pipes. PVC adaptors are suitable for 

direct connection to: 

■ Cast Iron pipework to BS 416:1973 

or EN 877. 

■ PVC O-ring socketed pipe to 

BS 4514:1983. 

Deck Supports 

Deck supports are used where ACO 

Fulbora HP rainwater outlets are installed 

in metal deck roof constructions, providing 

a stable and secure interface between the 

outlet and roof. Deck Supports are 

manufactured from 1.5 mm steel sheet 

and finished primed in a red oxide paint 

finish. Suitable for all types of metal deck 

roofing. 

Terrace Grates 

Terrace grates are designed for installations 

with terraced paving slabs or block 

paviors. Terrace grates can only be used 

with circular raising rings as described 

above. A slotted fixing detail allows 90° 

rotational movement to accommodate 

slab/pavior patterns.

HP Range Accessories - Product Selector 

Raising Rings for Circular Outlets 

Vertical Spigot, Vertical Screw, 

45 ° Spigot, 90 ° Spigot and 

Refurbishment Outlets 

(dome grate only) 

ACO fulbora 


Outlet Model Sales Code A B C Weight 

(kg) 

2HP-D; 2HP-TD; 3HP-D; 3HP-TD; 245HP-D; 345HP-D; 2/3RR 161 128 150 0.72 

290HP-D; 390HP-D; 3HP-RFO 

4HP-D; 4HP-TD; 6HP-D; 6HP-TD; 445HP-D; 490HP-D; 4HP-RFO 4/6RR 233 128 222 1.14 


Raising Rings for Balcony Outlets 

Raising Rings for Gully Outlets 

PVC Adaptors 

Sales Code Male Thread Outside Length Length Weight 

Ø A (BSP) Ø B (mm) L (mm) l (mm) (kg) 

2STC 2” 57.0 305 148 0.33 

3STC 3” 82.0 305 148 0.55 

4STC 4” 110.5 305 148 1.12 

6STC 6” 160.0 305 148 2.25 

Material : PVC-u. 

Sales Code A B Weight 

(kg) 

BO-RR 220 115 1.25 


Sales Code A B Weight 

(kg) 

GO-RR 240 115 1.85 


25 

HP Range

HP Range 

26 

ACO fulbora 


Deck Supports for Circular Outlets 

Sales Code: 2/3DS 

Sales Code: 4/6DS 

Terrace Grates for Circular Outlet Raising Rings 

Sales Code: 2/3 TG 

Sales Code: 4/6TG 



Outlet Model Sales Code Weight 

(kg) 

2HP-D; 2HP-TD; 2/3DS 1.97 

3HP-D; 3HP-TD; 

245HP-D; 345HP-D; 

290HP-D; 390HP-D; 

3HP-RFO 

4HP-D; 4HP-TD; 4/6DS 2.91 


445HP-D; 490HP-D; 

4HP-RFO 

Outlet Model Sales Code Weight Appropriate Raising 

(kg) Ring Sales Code (Ref.) 

2HP-D; 2HP-TD; 2/3TG 0.70 2/3RR 


245HP-D; 345HP-D; 

290HP-D; 390HP-D; 

3HP-RFO 

4HP-D; 4HP-TD; 4/6TG 1.52 4/6RR 


445HP-D; 490HP-D; 

4HP-RFO

ACO fulbora 


ACO Fulbora FreeDeck 

Drainage System 

For rainwater applications requiring 

efficient drainage of permeable surfaces 

including block paviors, paving slabs, 

shingle and washed ballast, the 

ACO Fulbora FreeDeck system provides 

the ideal solution for terraces, decks, 

patios, balconies and roof gardens. 

ACO Fulbora FreeDeck is a simple, 

effective and efficient drainage solution 

for awkward above ground applications. 

ACO Fulbora FreeDeck can be utilised as 

a doorway rainwater interception unit to 

give wheel chair access to both private 

and public buildings - ideal for Part M 

accessibility regulations. 

ACO Fulbora FreeDeck 

Drainage System 


Product Selector 30 

Appendices 



FreeDeck

FreeDeck 

28 

ACO fulbora 


ACO Fulbora FreeDeck Drainage System 

Description 

The ACO Fulbora FreeDeck linear deck 

drainage system is ideal for efficient, 

practical solutions to above ground 

drainage applications involving block 

pavior, paving slab, shingle and washed 

ballast surface finishes for flat roof 

terraces, decks, balconies, patios and 

roof gardens. 

For the effective catchment of rainwater 

run-off and the management of 

percolation within building substrates. 

Rainwater penetrating the deck via paving 

slabs, block paviors or granular finishes 

are intercepted by the ACO Fulbora 

FreeDeck channel system which 

effectively conducts surface water to 

accessible outlet positions. 

ACO Fulbora FreeDeck channels are 

simply located directly on top of the water 

proofing layer and are laid to level invert. 

In addition to surface run-off, percolating 

water is able to enter the slotted 

sidewalls of the channel system and track 

through concealed ducts to rainwater 

outlet positions. Rainwater outlets are top 

accessible by means of finish level 

meshed gratings formed around the 

outlet positions. 

Either slotted or mesh gratings are 

available depending upon positioning of 

the channels and the nature of the foot 

traffic in the areas to be drained. For 

example in front of doorways, at the top 

of stairways or as perimeter drainage 

against parapet walls. 

The system is manufactured from hotdipped 

galvanised steel to BS 729 and 

provided with slotted or mesh gratings to 

suit pedestrian FACTA Load Class A 

applications. 

Slotted or mesh gratings 

available. 

Tunnel channels available for interconnecting 

components. 

Channels available in 500, 

1000 and 2000 mm lengths. 

Gullies allow easy access to rainwater outlets.

Product Benefits and Features 

Ideal for terraces, balconies, patios and 

roof gardens. 

■ Quick and simple to install. 

■ 75 mm level invert system. 

■ Compatible with shingle, paving slab 

and garden finishes. 

■ Durable galvanised steel 

construction. 

■ Slotted or mesh grating options 

available. 

■ Grating locks supplied as standard. 

■ 75-105 mm infinitely variable invert 

channels available to special order. 

■ Heelguard grating available for use in 

doorway drainage. 

Channel assembly is easy using the plate 

and socket connectors fitted on both 

ends of the channel. 

Channel sections are positively locked 

together to prevent lateral and 

longitudinal movement. 

ACO fulbora 


Gratings are secured in position with a 

90° turn to lock system. 

29 

FreeDeck FreeDeck

FreeDeck 

30 

ACO fulbora 


ACO Fulbora FreeDeck - Product Selector 

All components to FACTA Load Class A 

Material: Galvanised steel to BS 729. 

ACO ACO ACO ACO ACO Fulbora Fulbora Fulbora Fulbora Fulbora FreeDeck FreeDeck FreeDeck FreeDeck FreeDeck Linear Linear Linear Linear Linear Drainage Drainage Drainage Drainage Drainage Channels Channels Channels Channels Channels 

Note, slotted grate shown for reference, grating 

not supplied with channel. 

ACO ACO ACO ACO ACO Fulbora Fulbora Fulbora Fulbora Fulbora FreeDeck FreeDeck FreeDeck FreeDeck FreeDeck Channel Channel Channel Channel Channel End End End End End Plate Plate Plate Plate Plate 

ACO ACO ACO ACO ACO Fulbora Fulbora Fulbora Fulbora Fulbora FreeDeck FreeDeck FreeDeck FreeDeck FreeDeck Slotted Slotted Slotted Slotted Slotted Grating Grating Grating Grating Grating 

Slot width : 10 mm. 

ACO ACO ACO ACO ACO Fulbora Fulbora Fulbora Fulbora Fulbora FreeDeck FreeDeck FreeDeck FreeDeck FreeDeck Mesh Mesh Mesh Mesh Mesh Grating Grating Grating Grating Grating 

Mesh size 30 x 14 mm. 

Sales Code Length Width Height Weight 

(mm) (mm) (mm) (kg) 

36980 2000 130 75 4.8 

36981 1000 130 75 2.4 

36982 500 130 75 1.3 



36983 - 130 52 0.04 



00276 1000 123 20 2.2 

00277 500 123 20 1.0 



36953 1000 123 20 2.3 

36952 500 123 20 1.3

ACO Fulbora FreeDeck - Product Selector 

All components to FACTA Load Class A 

Material : Galvanised steel to BS 729 

ACO ACO ACO ACO ACO Fulbora Fulbora Fulbora Fulbora Fulbora FreeDeck FreeDeck FreeDeck FreeDeck FreeDeck Gully Gully Gully Gully Gully 

ACO ACO ACO ACO ACO Fulbora Fulbora Fulbora Fulbora Fulbora Fr Fr FreeDeck Fr FreeDeck 

eeDeck eeDeck eeDeck TT 

Tunnel TT 

unnel unnel unnel unnel Channel Channel Channel Channel Channel 

ACO Fulbora FreeDeck Tunnel Channel 

ideal for interconnecting drainage 

channels to gullies. Suitable for use with 

shingle, paving slab and garden finishes. 

ACO fulbora 




36960 250 250 75-105 4.1 



00328 2000 100 30 2.4 


The drainage channels are to be 

ACO Fulbora FreeDeck with locked slotted 

gratings supplied by ACO Fulbora 



SG17 5TE. 


hot dipped galvanised steel to BS EN 

ISO 1461 : 1999. 







No. *. 


31 

FreeDeck

FreeDeck 

ACO fulbora 

Rainwater engineering

Photograph of Calke Abbey Orangery and sketch of Calke Abbey 

by kind permission of the National Trust. 

ACO fulbora 


Architectural Eaves 

Treatments 

ACO Fulbora provides a comprehensive, 

free design service for Architectural 

Eaves Treatments requiring bespoke 

design work. 

ACO Fulbora have gained extensive 

experience over many years in the design 

and manufacture of eaves gutters, 

fascias, copings and soffits. 

Architectural Eaves 

Treatments 


Appendices 


Guttering

Guttering FreeDeck 

34 

ACO fulbora 


Architectural Eaves Treatments 

With qualified experience in manufacturing 

from cast and sheet metals, ACO Fulbora 

are able to offer design solutions in 

stainless steel, aluminium alloy, 

galvanised mild steel and gun-metal, no 

problem is too demanding. 

Working with Architects and Engineers, 

ACO’s qualified in-house design staff, 

using state of the art CAD design 

equipment, can produce both exciting but 

practical products for refurbishment and 

new build applications. 

For further details of the no obligation 

design service, contact the ACO ACO ACO Fulbora 

Fulbora 

Helpline Helpline as follows: 

Telephone: elephone: (+44) (0)1462 816666 

Fax: Fax: (+44) (0)1462 851490 

E-mail: E-mail: fulbora@aco.co.uk 

Application Application Examples 

Examples 

■ Eaves gutters. 

■ Fascias. 

■ Soffits. 

■ Interrupt gutters. 

■ Parapet wall gutters. 

■ Copings. 

■ Industrial valley gutters.

ACO fulbora 


Appendices 

1. Material Selection 

Overview 36 

Aluminium Alloys 36 

Gun-metal 36 

Galvanised Mild Steel 36 

Galvanic Corrosion 36 

The Electromotive Series 37 

Material Selection Tips 37 

2. Typical Roof Construction Detail 

Warm Roof 38 

Inverted Roof 39 

Un-insulated Roof 39 

Cold Roof 39 

HP 90° Outlet 40 

Gully Outlet 40 

Refurbishment Outlet 40 

FreeDeck Channel Drainage 41 

Balcony Outlet with Downpipe 41 

Two-Way Outlet 42 

Terrace Grate 42 

Metal Deck Support 42 

3. Installation Guidelines 

General Installation Notes 43 

Threaded Outlets 43 

Balcony Outlets 43 

Mk3 Raising Rings 43 

HP Circular Raising Rings 43 

Balcony/Gully Outlet Raising 

Rings 43 

Deck Supports 43 

Refurbishment Outlet 44 

4. Flexible Pipe Couplings 

General Installation Notes 45 

Appendices 

Appendices 

Appendices

Appendices 

36 

ACO fulbora 


Appendix 1 Material Selection 

Overview 

This section includes a brief insight into 

the materials that the rainwater drainage 

products featured in this Product 

Catalogue and Design Guide are 

manufactured from. 

In certain applications, it is vital to 

understand the long term operational 

effects that will occur if products are not 

specified accurately or installed correctly. 

Aluminium Alloys 

Aluminium alloys are very common and 

can be found in a wide range of 

applications ranging from cooking utensils 

to spacecraft. The material is 

commercially available in excess of 99% 

purity and is used primarily for its high 

resistance to corrosion, lightness and 

strength. 

Comparing similar products, aluminium 

alloys weigh around one-third as much as 

equivalent mild steel and stainless steel 

products and compared to mild steel, 

they have a much better corrosion 

resistance to atmospheric conditions. 

Because aluminium alloys are strong, 

lightweight, have good corrosion 

resistance, are cost effective and have 

excellent casting properties, this material 

is an obvious first choice for rainwater 

outlets and floor gullies. Additionally, 

being non-magnetic, aluminium will not 

attract ferrous particles that could 

otherwise cause silt traps and long term 

maintenance issues. 

ACO Fulbora aluminium rainwater outlets, 

shower drains and floor drains use LM6 

grade aluminium alloy to BS 1490. LM6 

exhibits excellent resistance to corrosion 

in both atmospheric and marine 

environments compared to other 

aluminium alloys, and is resistant to 

sulphate attack for curing concrete. 

When exposed to the atmosphere, a thin 

invisible aluminium oxide film forms on the 

surface of the material that protects the 

material from further oxidation. 

Gun-metal 

Gun metal possesses good tensile 

strength and corrosion resistant 

properties and is used in many bearing 

and marine applications. ACO Fulbora 

rainwater outlets are available in gunmetal 

when bi-metallic corrosion 

resistance arising from lead or copper 

materials is a potential risk. 

Gun-metal is an alloy of copper, tin and 

zinc. Admiralty gun-metal typically has a 

composition of 88% copper, 10% tin and 

2% zinc. 

Galvanised Mild Steel 

Mild steel is a convenient, ductile, easily 

worked and cost effective material that 

finds many uses in everyday applications 

around us. 

In its raw state, mild steel offers no 

resistance to corrosion and quickly forms 

a familiar rust (ferric oxide) on its surface 

unless precautions are taken to prevent 

oxidation taking place. 

Galvanising is a process that is commonly 

used to prevent corrosion and essentially 

consists of a layer of zinc applied to the 

surface of the steel. ACO Fulbora use a 

‘hot dip’ process of dipping the 

component into a vat of molten zinc. 

Galvanic Corrosion 

Galvanic corrosion occurs when two 

dissimilar metals are in electrical contact 

and connected by an electrolyte. An 

electrolyte conducts electricity and can 

be water solutions containing salts or 

acids - and need not be concentrated for 

the effect to take place. 

The effects of galvanic corrosion begin to 

play an important part when an aluminium 

rainwater outlet is used in conjunction 

with metallic membranes, such as lead or 

copper. 

The Electromotive Series provides an 

insight to the corrosion effects between 

dissimilar materials.

The Electromotive Series 

The susceptibility of different metals to 

corrosion whilst in contact with each 

other depends upon the difference 

between the contact potentials. The 

greater the potential difference, the 

greater the tendency for corrosion. The 

metal with the higher negative potential 

forms the anode and is corroded 

preferentially. 

Some examples from the Electromotive 

Series are shown opposite for illustration. 

Material Selection Tips 

■ For applications when dissimilar 

materials are in contact with each 

other wherever possible, select 

materials to be as close as possible 

to each other in the Electromotive 

Series. For example, if a roof is 

copper clad, select a gun-metal outlet 

as gun-metal is around 88% copper, 

this closely matches the cladding 

material. 

■ Where dissimilar metals cannot be 

readily avoided, care must be taken 

to electrically insulate the adjacent 

materials. For example where lead is 

dressed into an aluminium alloy 

outlet, carefully paint the aluminium 

body and clamp components with 

good quality bitumen paint or use an 

insulating gasket material such as 

neoprene sponge. Ideally, a gun-metal 

outlet should be used in conjunction 

with lead clad roofs. 

ACO fulbora 


Titanium 

304 Stainless Steel (passivated) More noble - 

Silver decreased corrosion 

Nickel 

Copper 

Gun-metal 

Lead 

Cast Iron Less noble - 

Aluminium increased corrosion 

Zinc 

Magnesium 

■ The effects of galvanic corrosion can 

be accelerated in saline 

environments. Caution should be 

observed with rainwater outlet 

applications close to coastal regions. 

37 

Appendices 

Appendices 

Appendices

Appendices 

38 

ACO fulbora 


Appendix 2 Typical Roof Construction Detail 

Warm Roof 

A warm roof is where the main mass of 

the roof structure lies below the main 

thermal insulation. The waterproof 

membrane is positioned above the 

insulation.

Inverted Roof 

An inverted roof is a form of warm roof 

where the main mass of the roof structure 

lies below the main thermal insulation, 

however, the waterproof membrane lies 

beneath the thermal insulation. 

Un-insulated Roof 

A roof without thermal insulation. This 

type of construction is only permitted in 

non-habitable buildings, e.g. garages. 

Cold Roof 

A cold roof is where the main mass of the 

structure lies above the thermal 

insulation. 

ACO fulbora 


39 

Appendices 

Appendices 

Appendices

Appendices 

40 

ACO fulbora 


HP 90 ° Outlet 

Gully Outlet 

Refurbishment Outlet

FreeDeck Drainage System 

Balcony Outlet with Downpipe 

ACO fulbora 


41 

Appendices 

Appendices 

Appendices

Appendices 

42 

ACO fulbora 


Two-Way Outlet 

Terrace Grate 

Metal Deck Support

Appendix 3 Installation Guidelines 

General Installation Notes 

All outlets must be securely attached to 

the roof structure using a suitable timber 

frame or deck support. The waterproof 

membrane must be fully dressed into the 

outlet body and securely clamped under 

the membrane clamp. 

Practical Design/Installation Tips 

✓ Do not design for the maximum outlet 

hydraulic capacity, allow a 10% factor 

of safety margin for intense storms 

and leaf/debris blockage. 

✓ Always allow for a back-up outlet, 

even though only one outlet may be 

required. 

✓ Rainwater outlets should be inspected 

and cleaned at least every 6 months 

to ensure reliable and continuous 

operation. 

Threaded Outlets 

For all ACO Fulbora threaded outlets (HP 

Vertical Screw and Two-Way outlets) are 

provided with female parallel threads 

conforming to BS 21:1985 for direct 

connection of threaded tube conforming 

to BS 1387:1985. This tube is supplied 

with a taper male thread conforming to 

BS 21:1985, which ensures a watertight 

joint when fully screwed into the unit. 

Threaded outlets are particularly 

recommended where a connection to the 

outlet is made within the thickness of the 

concrete slab. In these applications, the 

threaded connection creates a completely 

watertight seal. 

Where a PVC-u screw thread connector 

(STC) is used in conjunction with threaded 

outlets, the screw thread connector 

should be assembled with PTFE tape to 

ensure a watertight seal. 

Balcony Outlets 

The flat grating is configured with an 

array of eccentric grating slots that can 

be readily cut on site with a hacksaw to 

accommodate a downpipe. 

Mk 3 Raising Rings 

Where applicable, raising rings for the Mk 

3 range of rainwater outlets are simply 

assembled to the clamp ring by the same 

twist action that fixes the dome grate to 

the clamp. No fixings or loose 

components are required. 

For increased height requirements, Mk 3 

raising rings can be cascaded together. 

The dome grating attaches to the raising 

ring by the same action. 

Mk 3 raising rings cannot cannot be cut to suit a 

specific height requirement. Raising rings 

from the Mk3 and HP range of products 

are not not interchangeable. 

HP Circular Raising Rings 

HP raising rings can be used for domed 

grating outlets and terrace gratings only. 

HP raising rings cannot cannot be used with flat 

gratings. 

HP raising rings are secured with 

stainless steel fixings that are supplied 

with each raising ring product. 

Where required, the HP raising rings may 

be easily cut on site to a specific height 

using a hacksaw (for example, when using 

a terrace grate in conjunction with paving 

slabs). 

ACO fulbora 


Balcony/Gully Outlet Raising 

Rings 

Raising rings for balcony outlets and gully 

outlets are available and perform a similar 

function as the HP Circular raising rings 

as previously described. Separate 

stainless steel fixings are supplied with 

each unit. 

Deck Supports 

ACO deck supports are recommended for 

metal decked roof construction and are 

suitable for installation on all types of 

metal decked roofs. Deck supports have 

pre-drilled holes for ease of fixing. 

43 

Appendices 

Appendices 

Appendices

Appendices 

44 

ACO fulbora 


Refurbishment Outlet 

Refurbishment outlets are designed to 

conveniently fit within the existing 

rainwater outlet of the roof that is being 

refurbished, which means there is no 

need to remove the existing rainwater 

outlet. 

Refurbishment outlets incorporate a high 

performance domed grating and 

optimised tail pipe to maximise flow 

through the unit. The labyrinth finned seal 

ensures a watertight connection to the 

existing pipework. Two sealable access 

points within the body enable PU foam to 

be injected to fill the void between the old 

and new outlet. 

Step 1 

Strip back all roof coverings to the deck 

level. Clean out old outlet with wire brush 

and flush with clean water. 

Step 2 

Form timber frame around old outlet and 

lay insulation board/vapour barrier 

(35 mm minimum). 

Step 3 

Check clearance and trim tail pipe to 

length with hacksaw if necessary. 

Step 4 

Push on flexible labyrinth seal. 

Step 5 

Flush with clean water to lubricate and 

insert tail pipe into existing pipework. 

Seat flange on timber frame. 

Step 6 

Screw flange to timber frame. 

Step 7 

Inject PU foam through one port for 5 

seconds. Remove any surplus. 

Step 8 

Blank off ports with captive screws. 

Complete installation and 

weatherproofing.

Appendix 4 Flexible Pipe Couplings 

General Installation Notes 

ACO Fulbora can supply a wide range of flexible pipe couplings to suit all applications. 

ACO fulbora 


Sales Code Diameter A (mm) Diameter B (mm) 

Range Range 

43814 53 - 61 53 - 61 

43813 53 - 61 75 - 88 

43801 75 - 88 75 - 88 

43803 75 - 88 96 - 114 

43805 98 - 115 98 - 115 

43807 96 - 114 145 - 168 

43811 145 - 168 145 - 168 

All flexible couplings are supplied complete with two worm drive pipe clips. 

45 

Appendices 

Appendices 

Appendices

46 

ACO fulbora 


Other Products 

In addition to the range of rainwater 

outlets the following products are also 

available from ACO Fulbora: 

Stainless Steel and Aluminium 

Drainage Systems 

ACO Fulbora are specialists in stainless 

stainless 

steel steel linear linear and and point point drainage 

drainage 

products, providing off-the-shelf and 

custom made systems. 

Also stainless steel gullies gullies and floor 

floor 

drains drains manufactured from austenitic 

stainless steel, aluminium and nickel 

bronze. 

Grease Traps & Interceptors 

ACO Fulbora biological grease traps and 

non-biological grease interceptors are 

available to help prevent grease, oils and 

fats blocking drainage pipes. 

Stainless Steel Access Covers 

The New New ACO ACO Fulbora Fulbora EuroCover EuroCover 

double sealed recessed access cover is 

the ideal solution for applications 

demanding reliable, durable and hygienic 

operation. Combining highly corrosion 

resistant austenitic stainless steel and 

polyester resin concrete to produce a 

reliable air/water tight installation - every 

time. 

Wall Protection 

A range of resin concrete skir skirting skir ting ting, ting 

including straight, corner and end 

sections. Provides a protective buffer and 

can be used to seal wall and floor joints. 

Also available is a range of stainless steel 

corner corner guards guards guards available in a variety of 

profiles with integral fixing anchors. 

Creativity with Stainless Steel 

Architectural design solutions from 

stainless steel VeeLine can be formed 

into curves, radiuses and flat sheets as 

required for any type of application. 

Combining aesthetics and practicality for 

screens, furniture, air grilles, gratings and 

decorative features - the possibilities are 

endless.

ACO fulbora 


For further information on these ACO Fulbora products, please photocopy this 

page, tick the relevant boxes below and then fax it to us on 01462 851490. 

Please send me details of ACO Fulbora 

Drainage Systems for hygienic and 

corrosion resistant applications 

Please send me details on ACO Fulbora 

Wall Protection Systems 

Please include me on your database for 

future product updates and news 

Contact Name: _________________________________________ Position: __________________________________________________ 

Company/Practice Name: ___________________________________________________________________________________________ 

Address: __________________________________________________________________________________________________________ 

_________________________________________________________________________________________________________________ 

______________________________________________________ Postcode: _________________________________________________ 

Tel. No.: _______________________________________________ Fax. No.: __________________________________________________ 

E-mail.: ________________________________________________ 


Access Covers 


Grease Traps & Interceptors 

Please send me details of Creativity with 

Stainless Steel/Architectural Solutions 

I would like an engineer to contact me 

Please send me details of RIBA CPD seminar - 

Drainage Systems for hygienic and corrosion 

resistant applications - Specify it Right 

47

48 

ACO fulbora 


ACO fulbora 

ACO Fulbora is a member of ACO 

Technologies plc, which includes: 

ACO drain 

Resin concrete channel drainage 

systems. 

ACO sport ® 

Products for sport stadia and pitches, 

play grounds and landscaping. 

ACO technic 

Specialised building products 

made from resin concrete. 

ACO international 

Exports the above products 

all over the world. 

ACO wildlife 

Products designed to assist 

wildlife conservation. 

International enquiries 

Fax: +(0)1462 850957 

E-mail: international@aco.co.uk 

ACO United Kingdom 

ACO fulbora 

Hitchin Road 

Shefford, 

Bedfordshire 

SG17 5TE 

Tel: 01462 816666 

Fax: 01462 851490 

E-mail: fulbora@aco.co.uk 

Web site: www.aco.co.uk/fulbora 

ACO Worldwide 

Australia 

Austria 

Belgium 

China 

Czech Republic 

Denmark 

Finland 

France 

Germany 

Hungary 

Italy 

Netherlands 

Norway 

Poland 

Portugal 

Romania 

Russia 

Slovakia 

Slovenia 

Spain 

Sweden 

Switzerland 

© May 2004 ACO Technologies plc. All reasonable care has been taken in compiling the information in this document. All recommendations and suggestions on the use of ACO 

products are made without guarantee since the conditions of use are beyond the control of the Company. It is the customer's responsibility to ensure that each product is fit for its 

intended purpose and that the actual conditions of use are suitable. 

This brochure and any advice is provided by ACO Technologies plc (the company) free of charge and accordingly on terms that no liability (including liability for negligence) will 

attach to the Company or its servants or agents arising out of or in connection with or in relation to this brochure or any such advice. Any goods supplied by the Company will be 

supplied solely upon its standard conditions of sale, copies of which are available on request. 

The Company's policy of continuous product development and improvement renders specifications liable to modification. Information provided in this brochure is therefore 

subject to change without prior notification. 

USA

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