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BUILDING PRODUCTS

SustainableRainwaterSystems

The Specifier’s Choice for Sustainable PVCRoofline, Cladding and Rainwater Systems

www.swishbp.co.uk

UniclassL7314:P7114

CI/SfB (52.5) Xn6 1214

recycledcontent

carbonsaving

FM 09180KM508760 EMS 513947 OHS 523157

Rainwater_Bro_New.qxp_Sale Guide 16/12/2014 11:32

Swish Rainwater systems are ideal for those who wish to specify quality products that have areduced carbon footprint. They are unique in the UK in that they contain a high proportionof post consumer recycled PVC. Approximately 84% by weight of Swish gutters and pipes iscomposed of recycled material that is derived from old PVC windows and gutter systemsthat have been removed from buildings when refurbished or demolished.

Gutters and Pipes Swish gutters and pipes are two-tone inappearance. The core recycled material is greyand has been left this colour in order to avoidthe unnecessary use of additional colouringagent.

The outer skin is virgin material that is co-extruded onto the surface of the core toenhance the finished appearance and to aidcolour matching.

The production of PVC components fromrecycled material requires a fraction of theenergy needed to make virgin PVC.

A 70% saving in CO2 output is made duringproduction of Swish gutter and pipe profiles,when compared to production of 100% virginmaterial.

This innovative design results in a far moresustainable product without any compromise in strength, weather resistance or functionality.

AccessoriesSwish Rainwater accessories are injectionmoulded using virgin PVC. These componentsincorporate a simple clip together system forfitting gutter and pipe profiles. The gutter clipsinclude pre-installed seals that are lubricatedduring manufacture to ease the clippingprocess.

CertificationSwish rainwater systems aremanufactured to the following standards:

• Kitemark KM508760

• BS EN 607:2004 (Eaves Gutters & Fittings)

• BS EN 12200-1:2000 (Plastic Piping Systems)

• BS EN 1462:2004 (Brackets for Eaves Gutters)

• Manufactured under ISO 9001 Quality, ISO 14001Enviromental and OHSAS 18001Health & Safety Management Systems

BUILDING PRODUCTS

2

Introduction

KM508760

Corerecycled material

Outer Skinvirgin material

Square

Ogee

Round

Deep- flow

Swish Roofline& CladdingSystemsSwish Cellular PVC is suitedto the exposed conditionsencountered on clad facadesand at the roofline. Situatedin elevated positions andsubject to extreme weatherconditions, these areas aredifficult and costly to accessand maintain. Cellular PVCrequires no maintenance; itwill last the life time of thebuilding and can be fullyrecycled at the end of itsservice life.


3

General Swish Rainwater systems are designed forapplication in most domestic propertiesthroughout the UK.

The following information is given to helpspecifiers determine the basic requirements of a gutter system. Swish Technical Services canprovide further information and guidance asrequired. Tel: 01827 317238

System PerformanceTo determine the elements of the guttersystem the designer must calculate the likelyquantity of rainwater run-off from the roof asfollows:–

• Decide on the local rainfall intensity that thesystem must cope with.

• Calculate the effective roof area (m2) to bedrained.

To meet these requirements, the designer willneed to:

• Choose a gutter with sufficient flow capacity(litres per second)

• Decide on the system layout including the fallof gutter and the number and position ofoutlets required to maximise the flow.

Rainfall IntensityBS EN 12056 suggests likely rainfall intensitiesfor different areas of the UK, which may beexperienced as unusual events of 2 minutesduration, once every 1, 5, 50 and 500 years. Thevolume of water involved in these eventsincreases as they get rarer, but because of theirrelative infrequency, it is suggested that domesticgutter systems should be designed for a stormevent that is likely to occur once a year. Theintensity of such an event will vary across theUK, but it is sensible to design a system for aminimum intensity of 75mm/hour per m2 or aflow rate of 0.021 litres per second.

Roof AreaThe area of roof that drains into any one gutter(effective roof area : m2) can be calculated intwo ways (see diagram):–

• (H/2) + W x L

• L x W x Pitch Factor

A selection of pitch factors is shown in table A.For other pitch factors please contact SwishTechnical Services. Table A

Roof Pitch Pitch Factor

10º 1.088

20º 1.182

30º 1.288

40º 1.419

Flow CapacityIn general terms the most efficient section of gutter runs from the outlet, for a distance of 50 times the maximum height of water thegutter can hold when level. In the case of Swish Round gutter this is approximately 2.4m (ie. 48mm x 50). The capacities shown forSwish gutter systems have been independentlyassessed on a flow rig in accordance with BS EN 12056:2000 and are based on thefollowing:–

• A ‘short’ run of gutter (ie 50 x height ofwater the gutter is capable of containing).

• The gutter is set straight and level (ie a fall of up to 3mm/m).

• A storm event running at 75mm per hourper m2 or 0.021 litres per second.

• Capacities are reduced by a ‘safety factor’ of 10%. Table B

Short Gutter Flow litres* Max. area system per second drained m2

Round 0.9 43

Square 1.6 76

Ogee 2.2 105

Deepflow 1.8 86

*Outlet positioned at end of run

System LayoutIt is at once obvious from the flow capacitytable that different gutter shapes have differentflow and area drainage capabilities.

The roof area to be drained should becompared with the maximum area that a guttertype is able to drain (Table B: right column). If the figure in the table is too low the designerhas the following options:

• Select a system with a higher capacity

• Increase the fall on the gutter. With a longergutter this has its limitations, as water comingoff the tiles is more likely to overshoot thegutter at the lower end. With a shallow fasciathis may not even be an option. In additionthe greater volume of water in a long gutterwill tend to reduce the speed of flow.

• Move the outlet point to a central position to significantly increase the gutter drainagecapacity.

For further guidance please consult SwishTechnical Services.

Other Notes on Layout• If an end outlet is located around a corner

flow rates should be reduced by 15%.

• Larger valleys may require a dedicated outletat the corner.

• Where the roof is likely to discharge waterrapidly eg. long slopes or where low frictionroof coverings are employed, a larger guttermay be required to avoid water overshootingthe gutter.

Snow LoadingIn locations where heavy snowfall is common,fixing centres for gutter brackets should bereduced to 600mm for all Swish systems.

In addition all fixing holes should be used on allbrackets and the use of snowboards isrecommended where appropriate.

For further advice on the specification andinstallation of Swish gutters pleaseemail:[email protected] or call 01827 317200

Specification Guidance

W

H

L

Effective roof area


BUILDING PRODUCTS

4

Half Round System

Hopper forSquare/Round

SRH1

Accessories

112

5068

Half Round GutterA traditional half round gutter suitable for application on terracehouses, semi-detached houses and smaller office and commercialbuildings.

Specification – Gutter Laid Level

Max. height of water 48mm

Short length gutter 2.4m

Flow rate of short gutter 0.9 l/s

Max. area drained* – End outlet 43m2

Down pipe Round

*At rainfall rate 0.021 l/s (annual storm event)

Colours

Fascia Bracket

SRK1Union Bracket

SRU1

ExternalStopend

SRE1InternalStopend

SRE2

90º AngleSRA1

Running OutletSRO1

Pipe SocketSRS1

67.5º BranchSRY1

ShoeSRB3

Pipe ClipSRC1

Concealed Pipe Clip

SRC3

135º AngleSRA2 112.5º

Offset BendSRB2

92.5º Offset Bend

SRB1


5

Square System

112.5º Offset Bend

SQB2

Fascia Bracket

SQK1

Union BracketSQU1

ExternalStopend

SQE1

InternalStopend

SQE2

90º AngleSQA1

Running OutletSQO1

Stopend OutletSQO2

Pipe SocketSQS1

67.5º BranchSQY1

ShoeSQB3

135º AngleSQA2

Pipe Clip FlushSQC2

Pipe ClipSQC1

92.5º Offset Bend

SQB1

Square/RoundDownpipe Adaptor

SRD2

Square/RoundGutter Adaptor

SRD3

Square GutterClassic square system equally suitable for modern or older housingand often used on conservatories. The higher flow rate has thecapacity to drain larger roofs.






Down pipe Round/Square


117

57 65

Colours


6

Ogee System

BUILDING PRODUCTS

120

7080

Ogee GutterA modern, high capacity system ideal for larger roofs and whererun off is rapid. May be hung on traditional brackets or secretlyfixed with top hung brackets when clean lines are important. Achoice of corner angles that are positively fixed for added security.






Down pipe Round/Square


Colours

65

135º InternalAngle SGA3 Also available:

150º External Angle SGA5

135º External Angle SGA4

Corners

Union BracketSGU1

External Stopend Right Hand-SGE2 Left Hand-SGE1

Stopend Outlet Right Hand-SGO2 Left Hand-SGO3

90º Internal AngleSGA1

Running OutletSGO1

Fascia Bracket

SGK1

Top HungFascia

BracketSGK1

90º External AngleSGA2

112.5º Offset Bend

SQB2

Pipe SocketSQS1

67.5º BranchSQY1

ShoeSQB3

Pipe Clip FlushSQC2

Pipe ClipSQC1

92.5º OffsetBend SQB1


7

Deepflow System

112.5º Offset Bend

SRB2

Fascia Bracket

SDK1

Union BracketSDU1

90º AngleSDA1

Running OutletSDO1

Pipe SocketSRS1

67.5º BranchSRY1

ShoeSRB3

135º AngleSDA2

Concealed Pipe Clip

SRC3

Pipe ClipSRC1

92.5º Offset Bend

SRB1

Deepflow GutterA high capacity round system for larger houses and accomodationblocks. The higher flow rate is espcially suitable for draining largerroof areas.






Down pipe Round


114

70

170

68

Colours

ExternalStopend

SDE1InternalStopend

SDE2


Pioneer House, Mariner, Lichfield Road Industrial Estate, Tamworth,Staffordshire B79 7TF

Telephone: (01827) 317200Fax: (01827) 317201

e-mail: [email protected]

© Swish Building Products 12/14

A600

BUILDING PRODUCTS

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