Onduline Fixing Guide

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Fixing Guide

®

“No other

roong material

is so easy to

handle and so

simple to x.”

BBA

BRITISH

BOARD OF

AGREMENT

CERTIFICATE NO. 87 / 1823 / C

Onduline Fixing Guide

Introduction

Onduline is the world’s largest manufacturer of bituminous corrugated sheets. Onduline roong

sheets are easy to handle and simple to x. This xing guide sets out the correct xing method

and illustrates how Onduline accessories can be used to provide simple solutions to meet your

design requirements.

Please take the time to study these simple instructions to ensure the roof is both set out

and installed correctly insuring a durable and trouble free service life for your roof.

Onduline Material Composition

Onduline is a bituminous corrugated roong sheet developed continuously over 50 years to

provide outstanding weathering performance. It is manufactured from a mono-layer of organic

bres impregnated with bitumen under intense pressure and heat. The colour pigmentation system

“stains” the colour into the sheet with a UV resistant resin. The resulting sheet is exible, durable

and versatile, with excellent weathering and colour retention properties compared to conventional

painted sheets.

Sheet Specication:

Sheet size: 2 x 0.95m Weight: 6.4kg Corrugation size: 95 x 38mm

Thickness: 3mm Colours: Black, Green, Red, Brown.

Note: Take care to x Black Onduline sheets the correct way. The underside is easily identied by its dap-

pled surface nish. Check the sheet is a genuine Onduline product: All sheets are marked across the sheet

underside and to the top of the last corrugation with quality control information and brand I.D.

Benets:

• Guaranteed waterproof for the rst 15 years*

• Easy to x and handle, requiring no

specialist trade skills or equipment

• Contains no asbestos and presents no

health hazard

• Durable; rot and fungi resistant

• Withstands windspeeds up to 120mph (192kph)

*Terms and conditions apply

•

Ridge

Verge

Building Notation:

•

Eaves

Rafters

•

•

•

Facia

Board

Purlins

•

IMPORTANT:

It is essential that the correct support be applied to the Onduline sheets.

Consult the illustrations below to set the correct xing specication. First establish the roof

pitch. You can then check if a decking is required or at what centres the purlins should be xed.

Finally note the sheet end and corrugation side laps and set out the roof accordingly.

Onduline roof support design

Roof Pitch:15o and over

610mm

Gradient: 1 in 4 or less End Lap: 170mm Coverage per sheet: 1.56m2(nominal)

Support: Purlins xed at maximum Side Lap: 1 Corrugation

span of 610mm. Fixings: 20 per sheet

Roof Pitch: 10o to 15o

450mm

Gradient: 1 in 6 to 1 in 4 End Lap: 200mm Coverage per sheet: 1.54m2(nominal)

Support: Purlins xed at maximum Side Lap: 1 Corrugation

span of 450mm. Fixings: 25 per sheet

Roof Pitch: 5o to 10o

Fully supporting roof deck

Gradient: 1 in 6 to 1 in 11 End Lap: 300mm Coverage per sheet: 1.29m2(nominal)

Support: Purlins overlaid with fully Side Lap: 2 Corrugation

supporting roof deck. Fixings: 20 per sheet

Fixing

Guide

To get the best from Onduline

sheeting it is essential to x it

in accordance with these xing

instructions. To identify the

technical terms referred to,

consult the drawing on page 2. 1. Setting Out

Purlins must be of sufcient section to

give support between the rafters. Set

purlin centres as detailed on the

previous page 3, use spacers to keep

the purlins square.

2. Cutting

First mark out the sheet then cut

with an oiled coarse-toothed

handsaw or preferably a power

circular or skill saw.

3. Sheet Layout

Start xing sheets at the opposite end of

the roof from the prevailing winds. Cut

a sheet in half vertically and use to lay

sheet courses in a broken bond pattern.

4. Nailing

Only use Onduline PP or Safetop nails

on timber; check you have correct side

and end sheet laps. Use a string line to

keep xings in line.

5. Nailing

Nail sheets every corrugation at

the eaves and sheet overlaps and

either side of vertical joints. Nail

every other corrugation on

intermediate purlins.

6. Eaves Detail

The maximum sheet overhang at the

eaves is 7cm. Reduce the distance of the

rst purlin from the fascia accordingly.

8. Corrugation Filler

Seals corrugations at eaves and

ridge from penetration of sand and

dust into the roof space.

7. Eaves Ventilator Strip

Fixed to the eaves purlin it stops

ingress of birds and large insects,

whilst allowing free airow.

10. Ridge Unit Fixing

Start xing the ridge at the opposite end

of the roof from the prevailing winds and

form a 125mm overlap. Use a string line

to align and nail at every corrugation

xing one side rst.

14. Hip Detail

Fix hips before ridge. Lay support

boards and trimming purlins. Nail

ridge units to trimming purlins, cut

and dress units to ridge line with tin

snips and overlay with ridges.

15. Verge Fixing

Fasten timber barge board level

with the top of nished Onduline

roof. The Onduline verge units are

then overlaid and nailed into

position.

16. Verge Fixing

Alternatively, x barge board level with

the underside of the Onduline corru-

gation and overhang corrugation. Fold

down and nail in position.

17. Side Wall Abutment

Form side wall ashing to Onduline

roof, using Onduline ashing tape

or similar and x seperate cover

ashing to the wall.

11. Advanced Ridge Fixing

Option: To provide a smooth ridge

line, the end of the ridge unit below

the lapped portion can be trimmed

before xing to reduce the visual

impact of the formed lap.

Trim ridge ends below

125mm laps

125mm lap

12. Ridge End Finial Cap

Option: The end run of the ridges at

the verge can can be closed by

fabricating a timber nial piece by

marking and cutting the top radius

matching the radius of the ridge.

13. Ridge Unit Fixing

The nial piece is then screwed to

the barge boards over the verge

units and the ridges can be overlaid

onto it to seal the end of the ridge

line.

9. Ridge Unit Fixing

Fit ridge board and support purlin. Fix

second purlin, its position being dictated

by the roof pitch. The sheet / ridge can

then be xed.

Dome

Onduline Plate line

Overlap 30cm

Purlins

Important - For buildings with high

humidity levels, see designers note.

21. Roof Lights

Onduline PVC roof lights are easily xed

for natural illumination. They require pre-

drilling before nailing into position.

22.Roof Window

Provides illumination and

ventilation but does not reduce the

thermal insulation performance of the

roof. Cut opening in sheet and nail

into position.

23. Roof Ventilator

Roof ventilators are available in two

sizes to provide increased

ventilation. Simply cut opening in

sheet and nail into position.

19. Onduline Valley Lining Units

Fix valley boards/trimming purlins and

line with either Onduline, metal, or GRP

performed liner units. The vertical valley

depth should be 7.5cm.

24. Curved Roof Detail

The peak of the curve supported on

purlins laid at 425mm centres, or on

buildings with high humidity on close

boarding or fully supporting deck. The

Onduline sheets laid with double

corrugation side lap and 30cm end lap.

Purlins on side walls revert to 61cm with

ventilation provision as required.

25. Ondvilla and Compact Tile

Strips

The new range of tile strips

offer an exciting new range of

small modular roong elements

making it even easier to handle

and x. Ask the sales ofce for

separate xing details.

18. Eaves Tray

Developed for use with the Oversheeting

and Ondutile systems, the eaves tray can

also be used to reduce sheet overhang at

the eaves.

26. Fixing to Metal Framed Roofs

Fix Onduline to steel structures

using drill screws and safetop large

headed washers. On roof pitches

over 10 degrees use 14 xings per

sheet as illustrated above.

20. Abutment Flashing

Use Onduline pre-formed apron

ashing to seal end wall

abutments. Use separate cover

ashing to the wall to allow for

movement.

Condensation:

Onduline is resistant to the build up of condensation. However any single thickness roong

material is at risk of condensation formation during the winter months. Generally, air movement generated

by the installation of high and low level ventilation will avoid this problem. Onduline ventilation accessories

will assist in this provision.

The risk of condensation can be further reduced by xing an Ondutiss underlay membrane on a 12mm

plywood deck xed over the purlins set to 610mm centres to accept the Onduline nails when xing the

Onduline sheets. This is particularly importantant on buildings with high humidity levels. Insulation can also

be easily incorporated too providing ventilation is provided below the Onduline sheet, Design advice should

be sought from the manufacturer of the insulation products in this case.

Caution:

Covering of roofs can be hazardous. All work must be carried out with due regard to Health and Safety

regulations in accordance with HSG 33 working on roofs.

Maintenance:

To ensure long life the roof should be cleaned regularly of leaves and debris, as leaf mould can reduce the

effective life of the product. Also check that tree and shrub branches are not in

contact with the surface of the roof; as wind generated movement can cause surface damage to the sheets.

Guarantee:

The Onduline system is guaranteed to remain weatherproof for fteen years when xed and

maintained in accordance with the xing instructions. The guarantee is limited after ve years

service to the pro-rata replacement value of the Onduline materials set against the service life measured in

annual increments and does not extend to labour, related construction or third party costs.

Fire resistance:

Onduline PP sheets are not classied to External S.AA re rating as required in UK Building

Regulations for some classes of building such as housing. In these cases they must be xed on a suitable

fully supporting roof deck and the sheets coated with a proprietary AA surface paint

treatment (as used for bituminous felted at roong), applied in accordance with the paint

manufacturers instructions.

Literature:

Comprehensive literature is available giving full details of the Onduline product range and

conditions of use. The Sales department will be pleased to supply you with copies or

assist you in specic enquiries.

Onduline design notes:

www. .net

DECLARATION OF CONFORMITY

Manufactured in compliance with Europeans Union Directives

Mandates M121 & M122 in frame of the Europeans Construction

Products Directive 89/106/CEE and under clauses of Annexe ZA.

table ZA.1 of EN534. Corrugated Bitumen Sheets. standard

BBA

BRITISH

BOARD OF

AGREMENT

CERTIFICATE NO. 87 / 1823/C

Onduline Building Products Ltd.

Eardley House, 182-184 Campden Hill Road,

Kensington, London. W8 7AS

E-mail: enquiries@onduline.net

www.onduline.net

Telephone: 020 7727 0533

Fax: 020 7792 1390

Designed and produced by TKK Design © 2009