Roof Outlets Brochure

8/20/2019 Roof Outlets Brochure

1/32

UniclassL73144

CI/Sf6 S2(52.5) X

Product Catalogue and Specifiers Design Guide

ACO Building Drainage watertight rainwater outlets for flat roofs and other areas


2/32


3/32

Flat Roofs

Over the past few years, there have beenmajor advances and improvements in thematerials used in modern roofingtechnology. The specifier now hasrenewed confidence to take full advantageof the benefits of a flat roof and lowpitched roof design concept.

Flat roofs allow greater planning anddesign flexibility - roof-top gardens,terracing, patios, car parks, buildingservices and ventilation equipment,delivery areas and provision for addingadditional storeys at a later date. All canbe accommodated in a flat roof design.

Extensive or irregular shaped buildingscan be roofed more quickly, easily andcost effectively than a pitched roof.

Internal condensation is less of a riskbecause a flat roof uses less airspacethan a pitched roof. In addition, the needto heat and illuminate voids is eliminated.

Flat roofs allow easy access to naturallight and because of the simpleconstruction, internal partitioning is easy.This is especially advantageous forcommercial or industrial buildings.

The Need for Rainwater Outlets

Any flat area needs careful design toensure efficient removal of surface water.Traditionally, water from a flat roof orother structure is channelled by way of aslope to a rainwater pipe. Leaks can oftenoccur at the junction of the membraneand the rainwater pipe.

To overcome this potential problem,ACO Building Drainage rainwater outletsprovide a watertight joint between themembrane and the outlet bymechanically clamping the membrane tothe sump unit. Tried and tested for over40 years, ACO Building Drainage outletshave been used successfully on all typesof flat roof construction.

HP (High Performance) range of outlets providesrainwater drainage solutions for a wide range ofapplications.

Contents

Design Considerations

Hydraulic Design Consideration 4

Effective Catchment Area of Roofs 5

Product Ranges

Index To HP Ranges 7

HP (High Performance) Range 8

AppendicesIndex To Appendices 23

Appendix 1 Material Selection 24

Appendix 2 Typical Roof Construction 25

Appendix 3 Installation Guidelines 30

3

Introduction


4/32

Overview

The following notes are intended as aguide to the specifier who is designing arainwater drainage system for a roof. It isrecommended that reference is made toBritish Standard BS EN 12056 : 2000Gravity Drainage Systems Inside Buildings- Part 3 : Roof drainage, layout andcalculation for a comprehensive designguide.

For any rainwater drainage system to

work effectively and reliably, due accountmust be taken of the followingconsiderations:

Geographical location

Rainfall intensity

Effective catchment area of roof

Risk category of building

Hydraulic capacity of the drainagesystem(s) employed

Geographical Location

Rainfall intensity has a direct impact onthe performance requirements of anyrainwater drainage system. For roofs andpaved areas, it is normally impracticableto guard against very infrequent,extremely heavy rainfall situations and sothe designer should aim to strike abalance between the cost of the drainagesystem, the risk category of the buildingand the frequency and subsequentconsequences of flooding.

The drainage system for roofs and pavedareas should be capable of coping withthe intense rainfall that accompaniessummer thunderstorms.

The UK experiences complex and variedrainfall patterns. For example,surprisingly, although the upland areas ofnorthern and western parts of the BritishIsles experience higher average annualrainfall than the lowland areas, thelowland areas experience more frequentand more intense short duration rainfallthan the upland areas. British StandardBS EN 12056 : 2000 may be referred to

for further information and guidance onthis topic.

A rainfall intensity of 75 mm/hr (0.02 l/s/ m 2) is used throughout this designcatalogue.

Flow Rate Calculation

The flow rate Q, from roofs, paved areasand vertical walls and surfaces iscalculated as follows and assumes thatall surfaces are impermeable:

Q = A x I litres/second3600

where

Q = Volumetric flow rate (l/s)

A = Effective catchment area (m²)I = Rainfall intensity (75 mm/hr)

4

Design Considerations

Watertight Rainwater OutletsProduct Catalogue

HYDRAULIC DESIGN CONSIDERATIONS


5/32

Pitched Roofs

The effective catchment area of a freelyexposed pitched roof draining to an eavesor parapet wall gutter is equal to the planarea of the roof plus half its maximumelevation 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.

Flat Roofs & Paved Areas

For a monopitch flat roof or paved areawith a freely exposed horizontal surface,the effective catchment area is equal tothe plan area of the area to be drained asshown 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 upinto discrete areas to isolate the catchment areasas follows:

Catchment Area C = c x d (m²)Catchment Area D = c x e (m²)


5

EFFECTIVE CATCHMENT AREA OF ROOFS

Planl

g

f

Catchment area A

Catchment area B

a

b

Catchment area D

Catchment area C

c

e

d


6/32

Adjacent Vertical Surfaces

Flat roofs or paved areas that are adjacentto vertical walls and/or glazed surfaces willbe subjected to an increased hydraulicload due to the effects of wind driven rainagainst these vertical surfaces andsubsequently running off onto the roof.

For a flat roof exposed to a single wall asshown in Figure 4, assume the effectivecatchment area to be half the exposedvertical area of the wall and is shown as

follows:Figure 4. Monopitch Flat Roof with One AdjacentVertical 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 ormore vertical walls forming an angle orbay, the assumed resulting wind directionrequires that the combined areas of thewalls should be considered together asfollows:

Figure 5 Monopitch Flat Roof with Two AdjacentVertical 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.

Practical Design Tips

When designing an engineered rainwaterscheme, the following design hints aresuggested:

Do not design for the maximumoutlet hydraulic capacity, allow a10% factor of safety margin forintense storms and leaf/debrisblockage.

Always allow for a back-up outlet,even though only one outlet may berequired.

Rainwater outlets should beinspected and cleaned at least every6 months to ensure reliable andcontinuous operation.

6


EFFECTIVE CATCHMENT AREA OF ROOFS

H

a

Catchment area E

Catchment area B

b

Catchment area E

Catchment area B

Catchment area F

H

b

h

a


7/32

HP (High Performance) Range

The extensive range of products includedin the ACO Building Drainage HP (HighPerformance) range of outlets providesrainwater drainage solutions for a widerange of applications.

Key features of this high quality productrange include advanced grating geometryincreasing the flow of water through theoutlet compared to conventional unitsand secure gratings to prevent vandalisingand theft.

The ACO Building Drainage HP rangeprovides a high performance, costeffective, high quality solution for mostrainwater applications.

A wide range of outlet sizes andconfigurations are available: 50 mm, 75mm, 100 mm and 150 mm.

Index to HP Ranges

Description 8

Product Features 8

HP Vertical Spigot Oulet - Dome Grate 11

HP Range Accessories 9

HP Range Product Selector 10

HP Vertical Spigot Outlet - Flat Grate 12

HP Vertical Screw Outlet 13

HP 45° Spigot Outlet 14

HP 90° Spigot Outlet 15

HP Balcony Spigot Outlet 16

HP Two-Way Screw Outlet 17

HP Gully Spigot Outlet 18

HP Refurbishment Outlet 19

HP Range Accessories 20

7

Product Ranges


8/32


HP Range

8

Description

The ACO Building Drainage HP range ofrainwater outlets provides acomprehensive selection of highperformance rainwater outlet solutions formost domestic, industrial and commercialapplications involving flat roofs, balconiesand terracing.

High Flow Rate

Advanced design features encourage ahigher flow rate of water through theoutlet compared to conventional systemsby reducing the amount of air that isdrawn into the outlet. If allowed to gounchecked, a vortex will form as thewater enters the outlet - the same effectcan be seen in the bath or a sink whenthe plug is removed.

Product Features

Cost effective drainage solution - high

flow rates minimises number ofoutlets required.

Secure grating to prevent vandalismand theft.

Comprehensive product range formost applications.

Durable, corrosion resistantconstruction.

Gun-metal optionally available.

At the centre of the vortex, a void isnaturally formed as the water spiralsthrough the outlet. Under these

conditions, both water and air are drawninto the outlet significantly reducingefficiency. For maximum flow rateefficiency, only water should enter theoutlet. This may result in the use of feweroutlets for a given installation.

The ACO Building Drainage HP range ofoutlets provide anti-vortex design featuresto minimise this effect and a twofolddesign approach is adopted to achievethis. On all circular domed gratings aninverted cup arrangement is integratedwithin the grating to breakdown the vortexeffect within the grating and in addition,the leaf guard geometry of the gratings isoptimised to encourage water to flowradially into the outlet, thereby minimisingthe vortex effect outside of the grating.

Reduced Installation Costs

Compared to conventional outlets, highperformance outlets mean either feweroutlets/pipe/groundworks with reducedinstallation costs, or greater security inextreme rainfall conditions.

Secure Gratings

All gratings for the HP range of productsare secured with stainless steel fixingsthat require either a socket wrench orspanner for removal and replacement.This provides additional security toprevent theft or vandalism.

Membrane Clamp

The roof membrane is positively securedinto the outlet body by a clamp and issecured by 2 stainless steel fixings. Themembrane clamp is serrated on theunderside for improved membrane clampgrip performance. The outlet designensures the integrity of the seal betweenthe clamp and body is not disturbedwhen the grating is removed formaintenance during the life of theinstallation.

Materials

All products are manufactured from LM6grade aluminium alloy to BS 1490 asstandard for optimum corrosionresistance.


9/32

9

HP Range Accessories

A wide range of accessories are availablefor the ACO Building Drainage HP rangeincluding raising rings, PVC connectors,terrace grates and deck support plates.See Pages 16-22 for details.

Pipe Connections

Refer to Appendix 4 for details of the fullrange of flexible pipe connectioncouplings that are available from ACOBuilding Drainage.

Options

Gun-metal to BS 1400 available tospecial order. Gun-metal should bespecified for use in conjunction withcopper or lead-clad roofs or whenconnected to copper pipes. Refer toAppendix 1 for further information.Suffix Sales Code with ‘GM’ for thisoption for example, 2HP-D GM.

Gratings and clamp rings can beprovided to suit corporate colourschemes and coding as required.

For further details of any options, contact theACO Building Drainage Sales Desk for moreinformation.


10/32

Product Selector

HP Vertical Spigot Outlet

General purpose rainwater outlets suitablefor direct connection to cast ironpipework to BS 416 : 1983/EN 877 orto PVC ‘O’-ring socket pipe to BS 4514 :1983. Other connections can be madeusing ACO Building Drainage flexiblecouplings or heat shrink sleeving. Verticalspigot outlets are available with eitherdomed or flat gratings. Flat gratings areused where either vehicles or pedestriantraffic is likely.

HP Vertical Screw Outlet

Screwed outlets are recommended whereconnection to the outlet occurs within thethickness of the slab and threadedconnections will form a completely gas-tight seal.

Vertical screw outlets have a femaleparallel thread to BS 21 : 1985 forconnecting directly to tubes conforming toBS 1387 : 1985 which is supplied witha taper male thread. This ensures acompletely watertight seal when screwedfully home into the outlet body. A rangeof PVC adaptors are available from ACOBuilding Drainage to allow connection toaluminium pipework, socketed andsocketless cast iron pipework and PVCpipework.

HP 45° & 90° Spigot Outlets

These angled problem solving units areparticularly relevant to suit more complexpipe run detail. Pipework connections asper vertical spigot details.

HP Balcony Spigot Outlet

The balcony outlet provides discrete safedrainage for balconies and walkways.Supplied complete with a D-shaped flatgrating, the outlet can be installed againsta wall. The grating is supplied with holesto receive either 50 mm, 75 mm or 100mm nominal bore rainwater downpipes.These are easily cut on site to suit theapplication.

HP Two-Way Screw Outlet

The two-way outlet is designed to beused at the junction of roofs and parapetwalls, or wherever a horizontal andvertical surface meet. Available to fit pipesizes of 50 mm, 75 mm and 100 mm.This flexible design of outlet allows eitherhorizontal or vertical outflow take-off.Pipework connections as per verticalscrew details.

HP Gully Spigot Outlet

The gully outlet is designed to fit intovalley gutters and is supplied with avertical spigot outlet and dome grating.Pipework connections as per verticalspigot details.

HP Refurbishment Outlet

When an existing flat roof is beingupgraded, the refurbishment outlet isdesigned to fit inside the existing outletand pipework with minimal disruptionwithout the need to remove the originaloutlet. The aluminium body incorporatesa wide fixing flange to enhance the bondwith roofing membranes and does notsuffer the distortion effects during theapplication of torched membranes.Outlets are supplied with a flexible finned

pipe seal ensuring a watertightconnection to existing pipework. The easeof use and minimal disruption to theexisting rainwater system makes this anextremely cost effective solution whenupgrading flat roofs.

0

HP Range



11/32

Pipework Connections

Vertical spigot outlets may be directlyconnected to the following:

Cast iron pipework to BS 416:1973or EN 877.

PVC ‘O’-ring socketed pipe to BS4514 : 1985 (for 3HP-D, 4HP-Dand 6HP-D outlets only).

Connection to 2HP-D units via heatshrink socket or pipe couplings.

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

11

HP Vertical Spigot Outlet - Dome Grate

Product Code

2HP-D

3HP-D

4HP-D

6HP-D

Nominal Bore PipeSize (mm)

50

75

100

150

Part Number

17001

17004

17007

17010

Flow Rate† (l/s)

1.7

5.0

10.7

14.1

Area Drained‡ (m 2)

81

240

514

675

Weight (kg)

2.39

2.49

4.23

4.67

Technical Information

Dimension

A

B

C

D

E

2HP-D

292

233

196

98

60

3HP-D

292

233

196

108

83

4HP-D

380

305

244

122

110

6HP-D

380

305

244

145

160

All dimensions in mm.

A

B

C

D

E

Membrane

Physical Dimensions

Specification Clause

The rainwater outlets 2HP-D/3HP-D/ 4HP-D/6HP-D* are to be ACO BuildingDrainage HP vertical spigot outlets withlocked dome grating supplied by ACOBuilding Drainage (a division of ACOTechnologies plc), of Hitchin Road,

Shefford, Bedfordshire, UK, SG17 5TE.All components to be manufactured fromgrade LM6 aluminium alloy to BS 1490/ gun-metal to BS EN 1982*.

All components used within the scope ofthis system are shown on Drawing No. *and all work shall be carried out strictlyin accordance with the manufacturersinstructions and the installation detailsare set out on Drawing No. *.

* please delete or complete as appropriate.


12/32


Vertical spigot outlets may be directlyconnected to the following:


PVC ‘O’-ring socketed pipe to BS4514 : 1985 (for 3HP-F, 4HP-F and6HP-F outlets only).

Connection to 2HP-F units via heatshrink socket or pipe couplings.


Product Code

2HP-F

3HP-F

4HP-F

6HP-F


50

75

100

150

Part Number

17002

17005

17008

17011

Flow Rate† (l/s)

1.7

5.0

10.7

15.6


81

240

514

749

Weight (kg)

2.51

2.65

4.08

4.39


Dimension

A

B

C

D

E

2HP-F

292

233

196

98

60

3HP-F

292

233

196

108

83

4HP-F

380

305

244

122

110

6HP-F

380

305

244

145

160


A

B

C

D

E

Membrane

Physical Dimensions


The rainwater outlets 2HP-F/3HP-F/ 4HP-F/6HP-F* are to be ACO BuildingDrainage HP vertical spigot outlets withlocked flat grating supplied by ACOBuilding Drainage (a division of ACOTechnologies plc), of Hitchin Road,





HP Vertical Spigot Outlet - Flat Grate

2


13/32


Vertical screw outlets have a femaleparallel thread to BS 21 : 1985 forconnecting directly to tube conforming toBS 1387 : 1985 which is supplied witha taper male thread. This ensures acompletely watertight seal when screwedfully home into the outlet body.

Screwed outlets are recommended whereconnection to the outlet occurs within thethickness of the slab and threadedconnections will form a completely gas-tight seal within the slab.

Refer to HP Accessories section fordetails of ABS adaptors that are availablefrom ACO Building Drainage.


Product Code

2HP-TD

3HP-TD

4HP-TD

6HP-TD


50

75

100

150

Part Number

17003

17006

10779

17012

Flow Rate† (l/s)

1.7

5.0

10.7

13.5


81

240

514

648

Weight (kg)

2.29

2.32

4.03

4.13


Dimension

A

B

C

D

2HP-TD

292

234

121

35

3HP-TD

292

234

121

45

4HP-TD

380

305

133

38

6HP-TD

380

305

144

38


A

B

Membrane

D

C

Physical Dimensions


The rainwater outlets 2HP-TD/3HP-TD/ 4HP-TD/6HP-TD* are to be ACO BuildingDrainage HP vertical screw outlets withlocked dome grating supplied by ACOBuilding Drainage (a division of ACOTechnologies plc), of Hitchin Road,




HP Vertical Screw Outlet - Dome Grate

13


14/32


45° spigot outlets may be directlyconnected to the following:


Connection to PVC pipework via heatshrink socket or pipe couplings.


Product Code

245HP-D

345HP-D

445HP-D


50

75

100

Part Number

17013

17014

17015

Flow Rate† (l/s)

1.7

5.0

10.7


81

240

514

Weight (kg)

3.34

3.77

4.81


Dimension

A

B

C

D

E

245HP-D

305

229

229

175

62

345HP-D

305

229

235

175

87

445HP-D

372

305

273

191

114


A

B

Membrane

C

DE

Physical Dimensions


The rainwater outlets 245HP-D/345HP-D/ 445HP-D* are to be ACO BuildingDrainage HP 45° spigot outlets withlocked dome grating supplied by ACOBuilding Drainage (a division of ACOTechnologies plc), of Hitchin Road,





HP 45° Spigot Outlet - Dome Grate

4


15/32


90° spigot outlets may be directlyconnected to the following:


PVC ‘O’-ring socketed pipe to BS4514 : 1985 (for 390HP-D and490HP-D outlets only).

Connection to 290HP-D via heatshrink socket or pipe couplings.


Product Code

290HP-D

390HP-D

490HP-D


50

75

100

Part Number

17016

17017

17018

Flow Rate† (l/s)

1.7

3.3

7.2


81

171

336

Weight (kg)

3.57

3.61

4.69


Dimension

A

B

C

D

E

290HP-D

305

229

124

232

62

390HP-D

329

229

121

267

83

490HP-D

405

305

142

285

110


A

B

CE

D

Membrane

Physical Dimensions


The rainwater outlets 290HP-D/390HP-D/ 490HP-D* are to be ACO BuildingDrainage HP 90° spigot outlets withlocked dome grating supplied by ACOBuilding Drainage (a division of ACOTechnologies plc), of Hitchin Road,




HP 90° Spigot Outlet - Dome Grate

15


16/32


Balcony outlets may be directlyconnected to the following:


PVC ‘O’-ring socketed pipe to BS4514 : 1985 (for 3HP-BO and 4HP-

BO outlets only).

Connection to 2HP-BO units via heatshrink socket or pipe couplings.


Product Code

2HP-BO

3HP-BO

4HP-BO


50

75

100

Part Number

17019

17020

17021

Flow Rate† (l/s)

1.7

5.0

8.4


81

240

403

Weight (kg)

2.58

2.71

2.77


Dimension

A

B

C

D

E

F

G

2HP-BO

270

205

52

125

235

180

60

3HP-BO

270

205

52

125

235

180

83

4HP-BO

270

205

52

125

235

180

110


A

B

242

186

G

F

C

D

E

Membrane

Physical Dimensions


The rainwater outlets 2HP-BO/3HP-BO/ 4HP-BO* are to be ACO BuildingDrainage HP Balcony spigot outlets withlocked flat grating supplied by ACOBuilding Drainage (a division of ACOTechnologies plc), of Hitchin Road,





HP Balcony Spigot Outlet - Flat Grate

6


17/32


Two Way outlets have a female parallelthread to BS 21 : 1985 for connectingdirectly to tube conforming to BS 1387 :1985 which is supplied with a tapermale thread. This ensures a completelywatertight seal when screwed fully homeinto the outlet body.

Screwed outlets are recommended whereconnection to the outlet occurs within thethickness of the slab and threadedconnections will form a completely gas-tight seal within the slab.

Refer to HP Accessories section fordetails of ABS adaptors that are availablefrom ACO Building Drainage.


Flow Rate† (l/s) Area Drained‡ (m 2)

Product Code

2HP-2W

3HP-2W

4HP-2W

Nominal BorePipe Size (mm)

50

75

100

Part Number

17022

17023

17024

Vertical Outflow

1.7

3.9

6.0

HorizontalOutflow

1.7

1.5

2.0

Vertical Outflow

81

189

288

HorizontalOutflow

81

93

110

Weight (kg)

2.14

2.22

2.23


Dimension

A

B

C

D

E

F

Overall Length

2HP-BW

204

70

191

214

50

45°

225

3HP-BW

204

70

191

214

50

45°

225

4HP-BW

204

70

191

214

50

45°

225


E

A

F

B

C

D

Membrane

Physical Dimensions


The rainwater outlets 2HP-2W/3HP-2W/ 4HP-2W* are to be ACO BuildingDrainage HP Two-Way screw outlets withlocked flat grating supplied by ACOBuilding Drainage (a division of ACOTechnologies plc), of Hitchin Road,




HP Two-Way Screw Outlet - Flat Grate

17


18/32


Gully outlets may be directly connected tothe following:


PVC ‘O’-ring socketed pipe to BS4514 : 1985.


Product Code

3HP-GO

4HP-GO


75

100

Part Number

17025

17026

Flow Rate† (l/s)

5.0

10.4


240

500

Weight (kg)

3.89

4.02


Dimension

A

B

C

D

E

Overall Length

3HP-GO

228

188

251

130

83

334

4HP-GO

228

188

251

130

110

334


A

B

E

D

C

Membrane

Physical Dimensions


The rainwater outlets 3HP-GO/4HP-GO*are to be ACO Building Drainage HPGully outlets with locked dome gratingsupplied by ACO Building Drainage (adivision of ACO Technologies plc), ofHitchin Road, Shefford, Bedfordshire,

UK, SG17 5TE.All components to be manufactured fromgrade LM6 aluminium alloy to BS 1490/ gun-metal to BS EN 1982*.




HP Gully Spigot Outlet - Dome Grate

8


19/32


Refurbishment outlets are designed to fitthe following range of existing pipeworksystems:

3HP-RFO : 71.5 to 78.5 mm internalpipe diameter.

4HP-RFO : 97.0 to 104.0 mm

internal pipe diameter.


Product Code

3HP-RFO

4HP-RFO


75

100

Part Number

17027

17028

Flow Rate† (l/s)

5.0

5.0


240

240

Weight (kg)

5.00

5.10


Dimension

A

B

C

D

E

F

G

3HP-RFO

456

304

346

266

63.5

95

205

4HP-RFO

456

304

346

266

88.9

120

205


A

B

C

D

E

F

G

Membrane

Physical Dimensions


The rainwater outlets 3HP-RFO/4HP-RFO* are to be ACO Building DrainageHP Refurbishment outlets with lockeddome grating supplied by ACO BuildingDrainage (a division of ACO Technologiesplc), of Hitchin Road, Shefford,

Bedfordshire, UK, SG17 5TE.All components to be manufactured fromgrade LM6 aluminium alloy to BS 1490/ gun-metal to BS EN 1982*.



HP Refurbishment Outlet - Dome Grate

19


20/32


HP Range Accessories

0

A wide range of accessories is availablefor the ACO Building Drainage HP rangeof rainwater outlets allowing easyinstallation in common and not socommon applications of roof construction,including warm and inverted roofs,terraces and concealed outlets underraised paving slabs.

Raising Rings

Raising rings are used where it isnecessary to raise the level of the domegrating above the outlet body, for example

an inverted roof construction. With theexception of the Balcony Outlets (HP-BO)and Gully Outlets (HP-GO), raising ringswill only accept dome gratings or TerraceGrates as the raising rings will not acceptthe standard flat grates.

Raising rings are easily cut with a hacksawon site if required to match installationrequirements, i.e. to suit paving slabs.Stainless steel extension fixings aresupplied with each raising ring.

Raising rings are also available for BalconyOutlets and Gully Outlets. All raising ringsare manufactured from LM6 aluminiumalloy to BS 1490 and are optionallyavailable in gun metal to BS 1400. Suffixsales code with ‘GM’ for this option.

PVC Adaptors

PVC adaptors are available for threaded

outlets - HP Vertical Screw (HP-TD); andHP Two-Way (HP-2W) systems. ABSadaptors provide a quick and convenientconnection to PVC and cast ironpipework.

The adaptors are suitable for connectionto all types of pipe systems including castiron socketed or socketless systems andare assembled using PTFE tape to ensurea watertight connection. Manufacturedfrom tough ABS, the adaptors aresupplied with a male thread andchamfered spigot for easy connection toPVC pipes. ABS adaptors are suitable fordirect connection to:

Cast Iron pipework to BS 416:1973or EN 877.

PVC O-ring socketed pipe toBS 4514:1983.

Deck Supports

Deck supports are used where ACOBuilding Drainage HP rainwater outlets areinstalled in metal deck roof constructions,providing a stable and secure interfacebetween the outlet and roof. DeckSupports are manufactured from 1.5 mmsteel sheet and finished primed in a redoxide paint finish. Suitable for all types ofmetal deck roofing.

Terrace Grates

Terrace grates are designed for

installations with terraced paving slabs orblock paviors. Terrace grates can only beused with circular raising rings asdescribed above. A slotted fixing detailallows 90° rotational movement toaccommodate slab/pavior patterns.


21/32

L

I

B

Male thread A

Outlet Model Product Code Part Number A B C Weight (kg)

2HP-D; 2HP-TD; 3HP-D; 3HP-TD; 245HP-D; 345HP-D;

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

2/3RR 17029 161 128 150 0.72

4HP-D; 4HP-TD; 6HP-D; 6HP-TD; 445HP-D; 490HP-D;4HP-RFO

4/6RR 10730 233 128 222 1.14


Raising Rings for Balcony Outlets

A

B

Product Code Part Number A B Weight (kg)

BO-RR 17031 220 115 1.25


Raising Rings for Gully Outlets

A

B

Product Code Part Number A B Weight (kg)

GO-RR 17032 240 115 1.85


ABS AdaptorsProduct Code Part Number Male Thread Ø

A (BSP)Outside Ø B

(mm)Length L

(mm)Length l

(mm)Weight

(kg)

2STC

3STC

4STC

6STC

15007

15008

15009

15010

2”

3”

4”

6”

57.0

82.0

110.5

160.0

305

305

305

305

148

148

148

148

0.33

0.55

1.12

2.25

Material : ABS.

A

B

C

HP Range Accessories - Raising Rings and Adaptors

21

Raising Rings for CircularOutlets

Vertical Spigot, Vertical Screw, 45°Spigot, 90° Spigot and RefurbishmentOutlets (dome grate only)


22/32

2

HP Range Accessories - Deck Support and Terrace Grates


Deck Supports for Circular OutletsSales Code: 2/3DS

335

335

Outlet Model Par t No’s Weight (kg) Product Code

2HP-D

2HP-TD

3HP-D

3HP-TD

245HP-D

345HP-D

290HP-D

390HP-D

17033 1.97 2/3DS

Sales Code: 4/6DS

415

415

4HP-D

4HP-TD

6HP-D

6HP-TD

445HP-D

490HP-D

3HP-RFO

4HP-RFO

17034 2.91 4/6DS


Terrace Grates for Circular Outlet Raising RingsSales Code: 2/3 TG

160

25

Outlet Model Part No’s Weight(kg)

Product Code Appropriate Raising RingSales Code (Ref.)

2HP-D

2HP-TD

3HP-D

3HP-TD

245HP-D

345HP-D

290HP-D

390HP-D

17035 0.70 2/3TG 2/3RR

Sales Code: 4/6TG

25

232 4HP-D

4HP-TD

6HP-D

6HP-TD

445HP-D

490HP-D3HP-RFO

4HP-RFO

17036 1.52 4/6TG 4/6RR



23/32

1. Material Selection

Overview 24

Aluminium Alloys 24

Gun-metal 24

Galvanised Mild Steel 24

Galvanic Corrosion 24

The Electromotive Series 24

Material Selection Tips 24

2. Typical RoofConstruction Detail

Warm Roof 25

Inverted Roof 25

Un-insulated Roof 26

HP 90° Outlet 26

Gully Outlet 27

Refurbishment Outlet 27

Balcony Outlet with Downpipe 28

Two-Way Outlet 28

Terrace Grate 29Metal Deck Support 29

3. Installation Guidelines

General Installation Notes 30

Threaded Outlets 30

Balcony Outlets 30

HP Circular Raising Rings 30

Balcony/Gully Outlet Raising Rings 30

Deck Supports 30

Refurbishment Outlet 31

23

Appendices


24/32

Overview

This section includes a brief insight intothe materials that the rainwater drainageproducts featured in this ProductCatalogue and Design Guide aremanufactured from.

In certain applications, it is vital tounderstand the long term operationaleffects that will occur if products are notspecified accurately or installed correctly.

Aluminium Alloys

Aluminium alloys are very common andcan be found in a wide range ofapplications ranging from cooking utensilsto spacecraft. The material iscommercially available in excess of 99%purity and is used primarily for its highresistance to corrosion, lightness andstrength.

Comparing similar products, aluminiumalloys weigh around one-third as much asequivalent mild steel and stainless steelproducts and compared to mild steel,they have a much better corrosionresistance to atmospheric conditions.

Because aluminium alloys are strong,lightweight, have good corrosionresistance, are cost effective and haveexcellent casting properties, this materialis an obvious first choice for rainwateroutlets and floor gullies. Additionally,being non-magnetic, aluminium will notattract ferrous particles that couldotherwise cause silt traps and long termmaintenance issues.

ACO Building Drainage aluminiumrainwater outlets, shower drains and floordrains use LM6 grade aluminium alloy toBS 1490. LM6 exhibits excellentresistance to corrosion in bothatmospheric and marine environmentscompared to other aluminium alloys, andis resistant to sulphate attack for curingconcrete.

When exposed to the atmosphere, a thininvisible aluminium oxide film forms onthe surface of the material that protectsthe material from further oxidation.

Gun-metal

Gun metal possesses good tensilestrength and corrosion resistant propertiesand is used in many bearing and marineapplications. ACO Building Drainagerainwater outlets are available in gun-metal when bi-metallic corrosionresistance arising from lead or coppermaterials is a potential risk.

Gun-metal is an alloy of copper, tin andzinc. Admiralty gun-metal typically has acomposition of 88% copper, 10% tin and2% zinc.

Galvanised Mild Steel

Mild steel is a convenient, ductile, easilyworked and cost effective material thatfinds many uses in everyday applicationsaround us.

In its raw state, mild steel offers noresistance to corrosion and quickly formsa familiar rust (ferric oxide) on its surfaceunless precautions are taken to preventoxidation taking place.

Galvanising is a process that is commonlyused to prevent corrosion and essentiallyconsists of a layer of zinc applied to thesurface of the steel. ACO BuildingDrainage use a ‘hot dip’ process ofdipping the component into a vat ofmolten zinc.

Galvanic Corrosion

Galvanic corrosion occurs when twodissimilar metals are in electrical contactand connected by an electrolyte. Anelectrolyte conducts electricity and can bewater solutions containing salts or acids -and need not be concentrated for theeffect to take place.

The effects of galvanic corrosion begin to

play an important part when analuminium rainwater outlet is used inconjunction with metallic membranes,such as lead or copper.

The Electromotive Series provides aninsight to the corrosion effects betweendissimilar materials.

The Electromotive Series

The susceptibility of different metals tocorrosion whilst in contact with eachother depends upon the differencebetween the contact potentials. Thegreater the potential difference, thegreater the tendency for corrosion. Themetal with the higher negative potentialforms the anode and is corrodedpreferentially.

Some examples from the ElectromotiveSeries are shown opposite for illustration.

Material Selection Tips

For applications when dissimilarmaterials are in contact with eachother wherever possible, selectmaterials to be as close as possibleto each other in the ElectromotiveSeries. For example, if a roof iscopper clad, select a gun-metal outletas gun-metal is around 88% copper,this closely matches the claddingmaterial.

Where dissimilar metals cannot bereadily avoided, care must be takento electrically insulate the adjacentmaterials. For example where lead isdressed into an aluminium alloyoutlet, carefully paint the aluminiumbody and clamp components withgood quality bitumen paint or use aninsulating gasket material such asneoprene sponge. Ideally, a gun-metaloutlet should be used in conjunctionwith lead clad roofs.

The effects of galvanic corrosion canbe accelerated in saline

environments. Caution should beobserved with rainwater outletapplications close to coastal regions.

4

Appendix 1 Material Selection


Titanium304 Stainless Steel (passivated)SilverNickelCopperGun-metalLeadCast IronAluminiumZincMagnesium

More noble - decreased corrosion

Less noble - increased corrosion


25/32

25

An inverted roof is a form of warm roofwhere the main mass of the roof structurelies below the main thermal insulation,however, the waterproof membrane liesbeneath the thermal insulation.

INVERTED ROOF

Reflective layerof chippings

ClampingRing

RaisingRing

Secure boltedgrating

Rigid insulationboard

VapourBarrier

Two layermastic asphalt

Outletbody

Structuraldeck

Sand/cementscreed to falls

Gravelballast

Clampingring

Raisingring


Rigid insulationboard

Two layer mastic asphalton isolating membrane

Outletbody

Structural deck Sand/cementscreed to falls

Appendix 2 Typical Roof Construction Detail

A warm roof is where the main mass ofthe roof structure lies below the mainthermal insulation. The waterproofmembrane is positioned above theinsulation.

WARM ROOF


26/32

HP 90° OUTLET

Three layer built upfelt roofing

Clampingring


Plywooddeck

Firringpiece

Insulation Timber joist Outlet body Vapour barrier Plasterceiling

A roof without thermal insulation. Thistype of construction is only permitted innon-habitable buildings, e.g. garages.


6

UN-INSULATED ROOF


27/32

GULLY OUTLET

REFURBISHMENT OUTLET

Gunmetalclampingring

Gunmetaldomicalgrate

Sheet leadgutter lining

Rigidinsulationboard

Timbergutter

Rigidinsulationboard

Ply baseGunmetalbody

Timber spacesin insulated gutter

Two layer high performancefelt layered onto vapour barrier Secure bolted grating Clampingring Timberframe Rigidinsulation board

Vapour barrier PU insulationport

PU expandedfoam insulation

Pipe sealExistingrainwater pipe

Structuraldeck

27


28/32

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 screed

to falls

Screw threadconnector

Grating

Clamping ring Reflec tive ch ippings onthree layer built up felt roofing

St ructura l deck Vapour ba rr ie r Rig id insulat ionboard


8


29/32

TERRACE GRATE

METAL DECK SUPPORT

Rigidinsulation board

Structural deck Outlet body Sand/cementscreed to falls

Two layermastic asphalt

Paving slabsballasting

Raisingring

Terracegrate

Clampingring

Paving slabsupport

Three layer felt Timber fillet Secure boltedgrating

Clamping ring Rigid insulation board withintegral vapour barrier to falls

Metal closure panel Metal deck Screwed outlet body Deck support

29


30/32

Appendix 3 Installation Guidelines

General Installation Notes

All outlets must be securely attached tothe roof structure using a suitable timberframe or deck support. The waterproofmembrane must be fully dressed into theoutlet body and securely clamped underthe membrane clamp.

Practical Design/Installation Tips

Do not design for the maximumoutlet hydraulic capacity, allow a10% factor of safety margin forintense storms and leaf/debrisblockage.

Always allow for a back-up outlet,even though only one outlet may berequired.

Rainwater outlets should beinspected and cleaned at least every6 months to ensure reliable andcontinuous operation.

Threaded Outlets

For all ACO Building Drainage threadedoutlets (HP Vertical Screw and Two-Wayoutlets) are provided with female parallel

threads conforming to BS 21:1985 fordirect connection of threaded tubeconforming to BS 1387:1985. This tubeis supplied with a taper male threadconforming to BS 21:1985, whichensures a watertight joint when fullyscrewed into the unit.

Threaded outlets are particularlyrecommended where a connection to theoutlet is made within the thickness of theconcrete slab. In these applications, thethreaded connection creates a completelywatertight seal.

Where an ABS screw thread connector

(STC) is used in conjunction withthreaded outlets, the screw threadconnector should be assembled withPTFE tape to ensure a watertight seal.

.

Balcony Outlets

The flat grating is configured with anarray of eccentric grating slots that canbe readily cut on site with a hacksaw toaccommodate a downpipe.

HP Circular Raising Rings

HP raising rings can be used for domedgrating outlets and terrace gratings only.HP raising rings cannot be used with flatgratings.

HP raising rings are secured withstainless steel fixings that are suppliedwith each raising ring product.

Where required, the HP raising rings maybe easily cut on site to a specific heightusing a hacksaw (for example, whenusing a terrace grate in conjunction withpaving slabs).

Balcony/Gully Outlet Raising Rings

Raising rings for balcony outlets and gullyoutlets are available and perform asimilar function as the HP Circular raisingrings as previously described. Separatestainless steel fixings are supplied witheach unit.

Deck Supports

ACO deck supports are recommended formetal decked roof construction and aresuitable for installation on all types ofmetal decked roofs. Deck supports havepre-drilled holes for ease of fixing.


0


31/32

Refurbishment Outlet

Refurbishment outlets are designed toconveniently fit within the existingrainwater outlet of the roof that is beingrefurbished, which means there is no needto remove the existing rainwater outlet.

Refurbishment outlets incorporate ahigh performance domed grating andoptimised tail pipe to maximise flowthrough the unit. The labyrinth finnedseal ensures a watertight connection tothe existing pipework. Two sealableaccess points within the body enablePU foam to be injected to fill the voidbetween the old and new outlet.

Step 1

Strip back all roof coverings to the decklevel. Clean out old outlet with wire brushand flush with clean water.

Step 2

Form timber frame around old outlet andlay insulation board/vapour barrier (35mm minimum).

Step 3

Check clearance and trim tail pipe tolength with hacksaw if necessary.

Step 4

Push on flexible labyrinth seal.

Step 5

Flush with clean water to lubricate andinsert 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 5seconds. Remove any surplus.

Step 8

Blank off ports with captive screws.Complete installation andweatherproofing.

Membrane

31


32/32

© March 2008 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

ACO Technologies plcACO Business Park,Hitchin Road,Shefford,BedfordshireSG17 5TE

Tel: 01462 816666Fax: 01462 815895

e-mail Sales: [email protected]

website: www.acobuildingdrainage.co.uk

Roof Outlets Brochure

Documents

Transcript of Roof Outlets Brochure