November 2011 (52.5) ACO Building Drainage · 2015. 12. 14. · November 2011. ACO Building Drainage ACO building drainage Our built environment is becoming ever more complex. Applications

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

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


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.


Hydraulic 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)


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)


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)


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



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)


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



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


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


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


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


12


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




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


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.












Vertical spigot outlets may be directly

connected to the following:


or EN 877.


1985 (for 3HP-F, 4HP-F and 6HP-F

outlets only).

� Connection to 2HP-F units via heat


HP vertical spigot outlet - flat grate


Physical dimensions


13

Product ranges


The rainwater outlets 2HP-TD/3HP-TD/ 4HP-

TD/6HP-TD* are to be ACO Building Drainage

HP vertical screw outlets with locked dome
















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.



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


Physical dimensions


A

BMembrane

D

C




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


14





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


The rainwater outlets 245HP-D/345HP-D/

445HP-D* are to be ACO Building Drainage

HP 45° spigot outlets with locked dome
















45° spigot outlets may be directly connected

to the following:


or EN 877.

� Connection to PVC pipework via heat


HP 45° spigot outlet - dome grate


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


15

Product ranges


The rainwater outlets 290HP-D/390HP-D/

490HP-D* are to be ACO Building Drainage

HP 90° spigot outlets with locked dome
















90° spigot outlets may be directly connected

to the following:

� Cast iron pipework to BS 416:1973 or EN

877.


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


A

B

CE

D

Membrane




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


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


16

A

B

242

186

G

F

C

DE

Membrane




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


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.












Balcony outlets may be directly connected to

the following:

� Cast iron pipework to BS 416:1973 or

EN 877.


1985 (for 3HP-BO and 4HP-BO

outlets only).

� Connection to 2HP-BO units via heat


HP balcony spigot outlet - flat grate

Physical dimensions



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


17

Product ranges


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

4HP-2W* are to be ACO Building Drainage

HP Two-Way screw outlets with locked flat
















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.



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



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



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)


18

A

B

E

D

C

Membrane




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


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.












Gully outlets may be directly connected to the

following:

� Cast iron pipework to BS 416:1973 or

EN 877.


1985.

HP gully spigot outlet - dome grate

Physical dimensions




19

Product ranges


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

are to be ACO Building Drainage HP

Refurbishment outlets with locked dome
















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



A

B

CD

E

F

G

Membrane




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


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


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


Part Number A B Weight (kg)

BO-RR 17031 220 115 1.25

Product Code


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


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


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


Part No’s Weight (kg) Product CodeSales Code: 2/3DS

Sales Code: 4/6DS

Product ranges


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


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


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



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


Outletbody

In situ castconcrete deck

Two layer mastic asphalton isolating membrane


26

Appendices


HP 90° outlet

Gully outlet

Refurbishment outlet

Three layer built upfelt roofing

Clampingring


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


Clampingring

Timber frame

Rigidinsulation board

Vapour barrier PU insulationport

PU expandedfoam insulation

Pipe sealExistingrainwater pipe

Structuraldeck


27

Appendices


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



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


Terrace grate

Metal deck support


29

Appendices


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.


30

Membrane

Appendices



31


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ACO Technologies plc


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.

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