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ACO Building Drainage
ACO Building Drainage Watertight RainwaterOutlets for Flat Roofs and Other Areas
Product catalogue and specifiers design guide
Drainage Systems
UniclassL73144CI/Sf6 S2
(52.5)
November 2011
ACO Building Drainage
ACO building drainage
Our built environment is becoming ever more
complex. Applications are becoming more
sophisticated and the increasing pressure of
regulations and standards make achieving
design, performance and financial goals ever
tougher.
ACO Building Drainage is a new concept
within the ACO Group. Our mission: to
eliminate design risk, to reduce installed and
life cost and to deliver exceptional finish and
performance in every product application.
We achieve this through three factors:
� High performance materials
� Design experience and project support
� Global manufacturing capacity
Our global resources and fabrication capacity
make it possible for us to deliver best value,
both with our standard products and with our
bespoke designs. Confidence is further
assured with quality systems that are in
accordance with ISO 9001-2008.
ACO Building Drainage’s extensive portfolio
includes:
� Roof/Balcony drainage systems
� Stainless steel gullies
� Standard stainless steel and galvanised
steel channels
� Bespoke channel drainage systems
� Stainless steel socketed pipe system
� Stainless steel and aluminium
access covers
� Anti-flood backflow protection systems
� Wetroom and shower drainage
� Grease Management systems
ACO Building Drainage is a division of ACO
Technologies plc and part of the worldwide
ACO Group. The Group has sales in excess of
£600 million worldwide with production
facilities in the UK, Germany, France,
Switzerland, Denmark, Spain, Poland, Czech
Republic, Australia and the USA. In total
more than 3500 people are employed in 40
countries throughout the world.
Tel: 01462 816666
Fax: 01462 851490
e-mail Enquiries: [email protected]
website: www.acobuildingdrainage.co.uk
2
Watertight Rainwater Outlets
Contents
3
Introduction
Flat roofs 4
The need for rainwater outlets 4
Design considerations
Hydraulic design considerations 5
Effective catchment area of roofs 6
Product ranges
Index to HP product ranges 8
Introduction 8
Description 8
Product features 9
HP range accessories overview 9
HP product selector 10
Technical information and order data 11
HP range accessories selector 20
Raising rings and adaptors 21
Deck support and terrace gratings 22
Appendices
Index to appendices 23
Appendix 1 - material selection 24
Appendix 2 - typical roof construction detail 25
Appendix 3 - installation guidelines 29
Watertight Rainwater Outlets
4
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
Building Drainage 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 Building Drainage
outlets have been used successfully on all
types of flat roof construction.
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.
The need for rainwater outlets
Introduction
HP (High Performance) range of outlets provides rainwater
drainage solutions for a wide range of applications.
Watertight Rainwater Outlets
Hydraulic design considerations
Design considerations
5
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 75mm/hr (0.02 l/s/ m2)
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 (75mm/hr)
Watertight Rainwater Outlets
66
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.
Figure 1. Pitched Roof
Catchment Area A = (f x l) + (g/2 x l) (m²)
= l(f + g/2) (m²)
All linear dimensions in metres.
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:
Figure 2. Monopitch Flat Roof
Catchment Area B = a x b (m²)
All linear dimensions in metres.
Figure 3. Dual Pitch Flat Roof
For a flat roof with a dual pitch, split the roof
up into discrete areas to isolate the catchment
areas as follows:
Catchment Area C = c x d (m²)
Catchment Area D = c x e (m²)
All linear dimensions in metres.
Planl
g
f
Catchment area A
Catchment area B
a
b
Catchment area D
Catchment area C
c
e
d
Effective catchment area of roofs
Pitched roofs Flat roofs & paved areas
Design considerations
Watertight Rainwater Outlets
77
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:
Figure 4. Monopitch Flat Roof with
One Adjacent Vertical Wall
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)
All linear dimensions in metres.
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:
Figure 5 Monopitch Flat Roof with Two
Adjacent Vertical Walls
Roof Catchment Area B = a x b (m²)
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.
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.
� 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.
Adjacent vertical surfaces Practical design tips
H
a
Catchment area E
Catchment area B
b
Catchment area E
Catchment area B
Catchment area F
H
b
h
a
Effective catchment area of roofs
Design considerations
Watertight Rainwater Outlets
8
The ACO Building Drainage 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.
The extensive range of products included in
the ACO Building Drainage 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 Building Drainage 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: 50mm, 75mm,
100mm and 150mm.
Introduction Description
Introduction 8
Description 8
Product features 9
HP range accessories overview 9
HP vertical spigot oulet - dome grate 11
HP vertical spigot outlet - flat grate 12
HP vertical screw outlet - dome grate 13
HP 45° spigot outlet - dome grate 14
HP 90° spigot outlet - dome grate 15
HP balcony spigot outlet - flat grate 16
HP two-way screw outlet - flat grate 17
HP gully spigot outlet - dome grate 18
HP refurbishment outlet - dome grate 19
HP range accessories selector 20
Index to HP product ranges
Product ranges
Watertight Rainwater Outlets
9
Product ranges
� 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 Building Drainage 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.
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.
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.
Product features
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 Building Drainage Sales Desk on
01462 816666 for more information.
A wide range of accessories are available for
the ACO Building Drainage HP range
including raising rings, PVC connectors,
terrace grates and deck support plates. See
Pages 20-22 for details.
Pipe connections
Refer to Appendix 3 for details of the full
range of flexible pipe connection couplings
that are available from ACO Building Drainage.
HP range accessories overview
Watertight Rainwater Outlets
10
HP product selector
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 Building Drainage
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 gas-tight 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 Building Drainage to allow
connection to aluminium pipework, socketed
and socketless cast iron pipework and PVC
pipework.
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 50mm, 75mm or 100mm
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 50mm,
75mm and 100mm. This flexible design of
outlet allows either horizontal or vertical
outflow take-off. Pipework connections as per
vertical screw details.
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 45° & 90° spigot outletsHP vertical spigot outlet HP gully spigot outlet
Product ranges
Watertight Rainwater Outlets
11
Product ranges
Technical information and order data
Specification clause
The rainwater outlets 2HP-D/3HP-D/ 4HP-
D/6HP-D* are to be ACO Building Drainage
HP vertical spigot outlets with locked dome
grating supplied by ACO Building Drainage
(a division of ACO Technologies plc),
ACO Business Centre, Caxton Road,
Bedford, Bedfordshire MK41 0LF.
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.
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.
HP vertical spigot outlet - dome grate
A
B
C
D
E
Membrane
2HP-D 50 17001 1.7 81 2.39
3HP-D 75 17004 5.0 240 2.49
4HP-D 100 17007 10.7 514 4.23
6HP-D 150 17010 14.1 675 4.67
Product Code Weight(kg)
Nominal Bore Pipe Size (mm) Part Number Area Drained‡ (m2)Flow Rate† (l/s)
† Based on a 35mm head of water over the outlet body.‡ Based on a rainfall intensity of 75mm/hr. Flow rates based on BS EN 12056 : 2000.
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
Dimension
All dimensions in mm
2HP-D 3HP-D 4HP-D 6HP-D
Physical dimensions
Watertight Rainwater Outlets
12
Technical information and order data
A
B
CD
E
Membrane
2HP-F 50 17002 1.7 81 2.51
3HP-F 75 17005 5.0 240 2.65
4HP-F 100 17008 10.7 514 4.08
6HP-F 150 17011 15.6 749 4.39
Product Code Weight(kg)
Nominal Bore Pipe Size (mm) Part Number Area Drained‡ (m2)Flow Rate† (l/s)
† Based on a 35mm head of water over the outlet body.‡ Based on a rainfall intensity of 75mm/hr. Flow rates based on BS EN 12056 : 2000.
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
Dimension 2HP-F 3HP-F 4HP-F 6HP-F
Product ranges
Specification clause
The rainwater outlets 2HP-F/3HP-F/ 4HP-
F/6HP-F* are to be ACO Building Drainage HP
vertical spigot outlets with locked flat grating
supplied by ACO Building Drainage (a division
of ACO Technologies plc), ACO Business
Centre, Caxton Road, Bedford,
Bedfordshire MK41 0LF.
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.
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-F, 4HP-F and 6HP-F
outlets only).
� Connection to 2HP-F units via heat
shrink socket or pipe couplings.
HP vertical spigot outlet - flat grate
All dimensions in mm
Physical dimensions
Watertight Rainwater Outlets
13
Product ranges
Specification clause
The rainwater outlets 2HP-TD/3HP-TD/ 4HP-
TD/6HP-TD* are to be ACO Building Drainage
HP vertical screw outlets with locked dome
grating supplied by ACO Building Drainage
(a division of ACO Technologies plc),
ACO Business Centre, Caxton Road,
Bedford, Bedfordshire MK41 0LF.
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.
Pipework connections
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
ABS adaptors that are available from ACO
Building Drainage.
HP vertical screw outlet - dome grate
All dimensions in mm
Physical dimensions
Technical information and order data
A
BMembrane
D
C
Product Code Weight(kg)
Nominal Bore Pipe Size (mm) Part Number Area Drained‡ (m2)Flow Rate† (l/s)
† Based on a 35mm head of water over the outlet body.‡ Based on a rainfall intensity of 75mm/hr. Flow rates based on BS EN 12056 : 2000.
2HP-TD 50 17003 1.7 81 2.29
3HP-TD 75 17006 5.0 240 2.32
4HP-TD 100 17009 10.7 514 4.03
6HP-TD 150 17012 13.5 648 4.13
A 292 292 380 380
B 234 234 305 305
C 121 121 133 144
D 35 45 38 38
Dimension 2HP-TD 3HP-TD 4HP-TD 6HP-TD
Watertight Rainwater Outlets
14
Technical information and order data
Product Code Weight(kg)
Nominal Bore Pipe Size (mm) Part Number Area Drained‡ (m2)Flow Rate† (l/s)
† Based on a 35mm head of water over the outlet body.‡ Based on a rainfall intensity of 75mm/hr. Flow rates based on BS EN 12056 : 2000.
245HP-D 50 17013 1.7 81 3.34
345HP-D 75 17014 5.0 240 3.77
445HP-D 100 17015 10.7 514 4.81
Product ranges
Specification clause
The rainwater outlets 245HP-D/345HP-D/
445HP-D* are to be ACO Building Drainage
HP 45° spigot outlets with locked dome
grating supplied by ACO Building Drainage
(a division of ACO Technologies plc),
ACO Business Centre, Caxton Road,
Bedford, Bedfordshire MK41 0LF.
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.
Pipework connections
45° spigot outlets may be directly connected
to the following:
� Cast iron pipework to BS 416:1973
or EN 877.
� Connection to PVC pipework via heat
shrink socket or pipe couplings.
HP 45° spigot outlet - dome grate
All dimensions in mm
Physical dimensionsA
BMembrane
C
DE
A 305 305 372
B 229 229 305
C 229 235 273
D 175 175 191
E 62 87 114
Dimension 245HP-D 345HP-D 445HP-D
Watertight Rainwater Outlets
15
Product ranges
Specification clause
The rainwater outlets 290HP-D/390HP-D/
490HP-D* are to be ACO Building Drainage
HP 90° spigot outlets with locked dome
grating supplied by ACO Building Drainage
(a division of ACO Technologies plc),
ACO Business Centre, Caxton Road,
Bedford, Bedfordshire MK41 0LF.
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.
Pipework connections
90° 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 390HP-D and 490HP-D outlets
only).
� Connection to 290HP-D via heat shrink
socket or pipe couplings.
HP 90° spigot outlet - dome grate
Physical dimensions
Technical information and order data
A
B
CE
D
Membrane
Product Code Weight(kg)
Nominal Bore Pipe Size (mm) Part Number Area Drained‡ (m2)Flow Rate† (l/s)
† Based on a 35mm head of water over the outlet body.‡ Based on a rainfall intensity of 75mm/hr. Flow rates based on BS EN 12056 : 2000.
290HP-D 50 17016 1.7 81 3.57
390HP-D 75 17017 3.3 171 3.61
490HP-D 100 17018 7.2 336 4.69
All dimensions in mm
A 305 329 405
B 229 229 305
C 124 121 142
D 232 267 285
E 62 83 110
Dimension 290HP-D 390HP-D 490HP-D
Watertight Rainwater Outlets
16
A
B
242
186
G
F
C
DE
Membrane
Product Code Weight(kg)
Nominal Bore Pipe Size (mm) Part Number Area Drained‡ (m2)Flow Rate† (l/s)
† Based on a 35mm head of water over the outlet body.‡ Based on a rainfall intensity of 75mm/hr. Flow rates based on BS EN 12056 : 2000.
2HP-BO 50 17019 1.7 81 2.58
3HP-BO 75 17020 5.0 240 2.71
4HP-BO 100 17021 8.4 403 2.77
Product ranges
Specification clause
The rainwater outlets 2HP-BO/3HP-BO/
4HP-BO* are to be ACO Building Drainage HP
Balcony spigot outlets with locked flat grating
supplied by ACO Building Drainage (a division
of ACO Technologies plc), ACO Business
Centre, Caxton Road, Bedford,
Bedfordshire MK41 0LF.
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.
Pipework connections
Balcony 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-BO and 4HP-BO
outlets only).
� Connection to 2HP-BO units via heat
shrink socket or pipe couplings.
HP balcony spigot outlet - flat grate
Physical dimensions
Technical information and order data
All dimensions in mm
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
Dimension 2HP-BO 3HP-BO 4HP-BO
E
A
F
B
C
D
Membrane
Watertight Rainwater Outlets
17
Product ranges
Specification clause
The rainwater outlets 2HP-2W/3HP-2W/
4HP-2W* are to be ACO Building Drainage
HP Two-Way screw outlets with locked flat
grating supplied by ACO Building Drainage
(a division of ACO Technologies plc),
ACO Business Centre, Caxton Road,
Bedford, Bedfordshire MK41 0LF.
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.
Pipework connections
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 gas-tight
seal within the slab.
Refer to HP Accessories section for details of
ABS adaptors that are available from ACO
Building Drainage.
HP two-way screw outlet - flat grate
Physical dimensions
Technical information and order data
All dimensions in mm
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 225 225 225
Dimension 2HP-2W 3HP-2W 4HP-2W
† Based on a 35mm head of water over the outlet body.‡ Based on a rainfall intensity of 75mm/hr. Flow rates based on BS EN 12056 : 2000.
Product Code Weight(kg)
Nominal Bore Pipe Size (mm) Part Number Horizontal
OutflowVerticalOutflow
VerticalOutflow
2HP-2W 50 17022 1.7 1.7 81 81 2.14
3HP-2W 75 17023 3.9 1.5 189 93 2.22
4HP-2W 100 17024 6.0 2.0 288 110 2.23
Horizontal Outflow
Flow Rate† (l/s) Area Drained‡ (m2)
Watertight Rainwater Outlets
18
A
B
E
D
C
Membrane
Product Code Weight(kg)
Nominal Bore Pipe Size (mm) Part Number Area Drained‡ (m2)Flow Rate† (l/s)
† Based on a 35mm head of water over the outlet body.‡ Based on a rainfall intensity of 75mm/hr. Flow rates based on BS EN 12056 : 2000.
3HP-GO 75 17025 5.0 240 3.89
4HP-GO 100 17026 10.4 500 4.02
A 228 228
B 188 188
C 251 251
D 130 130
E 83 110
Overall Length 334 334
Dimension 3HP-GO 4HP-GO
Product ranges
Specification clause
The rainwater outlets 3HP-GO/4HP-GO* are
to be ACO Building Drainage HP Gully outlets
with locked dome grating supplied by ACO
Building Drainage (a division of ACO
Technologies plc), ACO Business Centre,
Caxton Road, Bedford, Bedfordshire
MK41 0LF.
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.
Pipework connections
Gully 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.
HP gully spigot outlet - dome grate
Physical dimensions
Technical information and order data
All dimensions in mm
Watertight Rainwater Outlets
19
Product ranges
Specification clause
The rainwater outlets 3HP-RFO/4HP-RFO*
are to be ACO Building Drainage HP
Refurbishment outlets with locked dome
grating supplied by ACO Building Drainage
(a division of ACO Technologies plc),
ACO Business Centre, Caxton Road,
Bedford, Bedfordshire MK41 0LF.
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.
Pipework connections
Refurbishment outlets are designed to fit the
following range of existing pipework systems:
� 3HP-RFO : 71.5 to 78.5mm internal pipe
diameter.
� 4HP-RFO : 97.0 to 104.0mm internal
pipe diameter.
HP refurbishment outlet - dome grate
Physical dimensions
All dimensions in mm
Technical information and order data
A
B
CD
E
F
G
Membrane
Product Code Weight(kg)
Nominal Bore Pipe Size (mm) Part Number Area Drained‡ (m2)Flow Rate† (l/s)
† Based on a 35mm head of water over the outlet body.‡ Based on a rainfall intensity of 75mm/hr. Flow rates based on BS EN 12056 : 2000.
3HP-RFO 75 17027 5.0 240 5.00
4HP-RFO 100 17028 5.0 240 5.10
A 456 456
B 304 304
C 346 346
D 266 266
E 63.5 88.9
F 95 120
G 205 205
Dimension 3HP-RFO 4HP-RFO
Watertight Rainwater Outlets
20
A wide range of accessories is available for
the ACO Building Drainage 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. ABS adaptors
provide a quick and convenient connection to
PVC and cast iron 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 ABS, the adaptors are supplied with a
male thread and chamfered spigot for easy
connection to PVC pipes. ABS 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 Building
Drainage 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 1.5mm 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 selector
Product ranges
Watertight Rainwater Outlets
21
Product ranges
Raising rings and adaptors
ABS adaptors
Raising rings for circular outlets
Vertical Spigot, Vertical Screw, 45° Spigot, 90° Spigot
and Refurbishment Outlets (dome grate only)
A
B
C
A
B
Raising rings for balcony outlets
Raising rings for gully outlets
Outlet Model Weight (kg)Product Code Part Number CBA
All dimensions in mm.
2HP-D; 2HP-TD; 3HP-D; 3HP-TD; 245HP-D; 345HP-D; 2/3RR 17029 161 128 150 0.72
290HP-D; 390HP-D; 3HP-RFO
4HP-D; 4HP-TD; 6HP-D; 6HP-TD; 445HP-D; 490HP-D; 4/6RR 17030 233 128 222 1.14
4HP-RFO
L
I
B
Male thread A
GO-RR 17032 240 115 1.85
Product Code
All dimensions in mm.
Part Number A B Weight (kg)
BO-RR 17031 220 115 1.25
Product Code
All dimensions in mm.
Part Number A B Weight (kg)
Material: ABS.
Product Code Part Number Male Thread ØA (BSP)
Outside ØB (mm)
Length L(mm)
Length l(mm)
Weight(kg)
2STC 15007 2” 57.0 305 148 0.33
3STC 15008 3” 82.0 305 148 0.55
4STC 15009 4” 110.5 305 148 1.12
6STC 15010 6” 160.0 305 148 2.25
A
B
Deck support and terrace gratings
Watertight Rainwater Outlets
22
335
335
415
415
160
25
25
232
Deck supports for circular outlets
Terrace gratings for circular outlet raising rings
Sales Code: 4/6TG
Sales Code: 2/3 TG
2HP-D 17035 0.70 2/3TG 2/3RR
2HP-TD
3HP-D
3HP-TD
245HP-D
345HP-D
290HP-D
390HP-D
4HP-D 17036 1.52 4/6TG 4/6RR
4HP-TD
6HP-D
6HP-TD
445HP-D
490HP-D
3HP-RFO
4HP-RFO
Outlet Model
All dimensions in mm.
Part Number Weight (kg) Product Code Appropriate Raising RingSales Code (Ref.)
2HP-D 17033 1.97 2/3DS
2HP-TD
3HP-D
3HP-TD
245HP-D
345HP-D
290HP-D
390HP-D
4HP-D 17034 2.91 4/6DS
4HP-TD
6HP-D
6HP-TD
445HP-D
490HP-D
3HP-RFO
4HP-RFO
Outlet Model
All dimensions in mm.
Part No’s Weight (kg) Product CodeSales Code: 2/3DS
Sales Code: 4/6DS
Product ranges
Watertight Rainwater Outlets
Index to appendices
23
Appendices
Overview 24
Aluminium alloys 24
Gun-metal 24
Galvanised mild steel 24
Galvanic corrosion 24
The electromotive series 24
Material selection tips 24
Warm roof 25
Inverted roof 25
Un-insulated roof 25
HP 90° outlet 26
Gully outlet 26
Refurbishment outlet 26
Balcony outlet with downpipe 27
Two-way outlet 27
Terrace grate 28
Metal deck support 28
General installation notes 29
Threaded outlets 29
Balcony outlets 29
HP circular raising rings 29
Balcony/gully outlet raising rings 29
Deck supports 29
Refurbishment outlet 30
Appendix 1 - material selection
Appendix 3 - installation guidelines
Appendix 2 - typical roof
construction detail
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 Building Drainage 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 Building Drainage rainwater outlets are
available in gun-metal 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 Building Drainage
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.
� The effects of galvanic corrosion can be
accelerated in saline environments.
Caution should be observed with rainwater
outlet applications close to coastal regions.
Appendix 1 - material selection
Watertight Rainwater Outlets
24
Appendices
Titanium
304 Stainless Steel
(passivated)
Silver
Nickel
Copper
Gun-metal
Lead
Cast Iron
Aluminium
Zinc
Magnesium
More noble - decreased corrosion
Less noble - increased corrosion
Watertight Rainwater Outlets
25
Appendix 2 - typical roof construction detail
Appendices
Warm roof
Inverted 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.
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.
Reflective layer of chippings
ClampingRing
RaisingRing
Secure boltedgrating
Rigid insulationboard
VapourBarrier
Two layermastic asphalt
Outletbody
Structuraldeck
Sand/cementscreed to falls
Gravelballast
Clampingring
Raising ring
Secure boltedgrating
Rigid insulationboard
wo layer mastic asphaltn isolating membrane
Outletbody
Structural deck Sand/cementscreed to falls
Un-insulated roof
A roof without thermal insulation. This type of
construction is only permitted in non-
habitable buildings, e.g. garages.
Clampingring
Secure boltedgrating
Outletbody
In situ castconcrete deck
Two layer mastic asphalton isolating membrane
Watertight Rainwater Outlets
26
Appendices
Appendix 2 - typical roof construction detail
HP 90° outlet
Gully outlet
Refurbishment outlet
Three layer built upfelt roofing
Clampingring
Secure boltedgrating
Plywooddeck
Firringpiece
Insulation Timber joist Outlet body Vapour barrier Plasterceiling
Gunmetalclampingring
Gunmetaldomicalgrate
Sheet leadgutterlining
Rigidinsulationboard
Timbergutter
Rigidinsulationboard
Ply baseGunmetal body
Timber spacesin insulated gutter
Two layer high performancefelt layered onto vapour barrier
Secure boltedgrating
Clampingring
Timber frame
Rigidinsulation board
Vapour barrier PU insulationport
PU expandedfoam insulation
Pipe sealExistingrainwater pipe
Structuraldeck
Watertight Rainwater Outlets
27
Appendices
Appendix 2 - typical roof construction detail
Balcony outlet with downpipe
Two-way outlet
Clampingring
Flat grating withpipe cut-out
Two layer mastic asphalton isolating membrane
Outlet body Structural deck Sand/cement screedto falls
Screw threadconnector
Grating
Clampingring
Reflective chippings onthree layer built up felt roofing
Structuraldeck
Vapourbarrier
Rigid insulationboard
Watertight Rainwater Outlets
28
Rigidinsulation board
Structural deck Outlet body Sand/cementscreed to falls
Two layermastic asphalt
Paving slabsballasting
Raising ring
Terracegrate
Clamping ring
Paving slabsupport
Three layer felt Timber fillet Secure boltedgrating
Clamping ring Rigid insulation board with integral vapour barrier to falls
Metal closure panel Metal deck Screwed outlet body Deck support
Appendices
Appendix 2 - typical roof construction detail
Terrace grate
Metal deck support
Watertight Rainwater Outlets
29
Appendices
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 Building Drainage 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 an ABS 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.
HP circular raising rings
HP raising rings can be used for domed
grating outlets and terrace gratings only. HP
raising rings 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).
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.
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 (35mm
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.
Watertight Rainwater Outlets
30
Membrane
Appendices
Appendix 3 - installation guidelines
Watertight Rainwater Outlets
31
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ACO Building Drainage
A division of ACO Technologies plcACO Business CentreCaxton RoadBedfordBedfordshireMK41 0LFTel: 01462 816666Fax: 01462 851490
e-mail: [email protected]
The ACO Group: A strong family you can depend on.
© November 2011 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.