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Laying Procedure

Maximum Spans and Permissible Unsupported Overhang
The permissible spans between purlins or rails and the maximum unsupported overhang at eaves are detailed in the table below.

  Purlin Rail  
Profile Max Centres Clear Span Max Centres Clear Span Max Sheet Overhang
EUROSIX 1375 1300 1825 1750 350

Preliminary
Ensure all purlins and rails are within the specified spacing for the profile and end lap to be used and are firmly fixed to the structure.

If possible please commence laying sheets at the gable end away from prevailing wind.

Mitres
It is necessary to mitre opposing corners of two sheets where four sheets intersect (detailed in diagram).

Mitres should be clean cut as a straight diagonal.
Do not box mitre under any circumstances as the weathering effectiveness will be seriously reduced. Clearance of assembled mitre should be within 3 to 6mm to ensure adequate weather sealing.

Essential Procedures

Handling

The majority of deliveries in the UK are offloaded by piggyback forklift. However with subsequent crane handling you should be careful to avoid damage to the edges of the sheets. Use rope slings (not chains) and over the width use spreaders to eliminate the possibility of damage. The corners of the sheets are particularly vulnerable during the transportation period.

Never Push, drag or slide a sheet from the stack. Always consciously remove the sheet by lifting from the stack. Similarly lift the sheet into position on a roof, do not push or drag over the purlins or other roof sheets.

If an on site lift facility is unavailable each sheet should be carefully removed by hand as described above. Once removed, they should be manoeuvred into position by two men, one at each end.

Particular care should be taken in windy conditions.

If several stacks are to be laid one on top of another, timber cross bearers should be placed at 500mm intervals up to a maximum height of 300mm.

Sheets and accessories should ideally be stored inside until the sheets are in position on the building. They could be subject to damage from site debris and accidental collision. Rainwater condensation and extreme weather conditions can also adversely effect the sheets (particularly coloured sheets) during this storage period.

If it is not possible to store the products inside a building, a suitable site should be selected. The ground should be firm, level and as close to the construction site as possible. The sheets must be stacked on the cross bearers thus raising them off the ground. A simple protective frame should be constructed and covered with a waterproof material. Air must be allowed to circulate all round the stack. The whole frame and stack should be tilted to
encourage rainwater to drain freely.

The sheets are supplied covered in shrink wrapping, it is strongly recommended that this wrapping is not removed until the sheets are required for fixing. Should any sheets remain unused at the end of the working day all the sheets must be re-covered.

Whether the product is stored inside or outside the stacks should be regularly inspected to ensure that moisture has not penetrated the coverings. Coloured sheets are particularly vulnerable at this stage.

Profile Data

Standard Overlap Fixing Detail
EUROSIX reinforced roof pitch down to 5º
Manufacturers recommendations for Tek Screws

Sheltered & moderate exposure sites

Minimum Roof Pitch
(as laid)
End Lap
MM
End Lap
Treatments
Side Lap
Treatments
22.5 and over 150 Unsealed Unsealed
17.5 – 22.5 300 Unsealed Unsealed
15 – 17.5 150 Sealed Unsealed
10 – 15 150 Sealed Sealed
5 – 10 300 Double
Sealed
Sealed

Moderate & severe exposure sites

Minimum Roof Pitch
(as laid)
End Lap
MM
End Lap
Treatments
Side Lap
Treatments
22.5 and over 150 Unsealed Unsealed
17.5 – 22.5 150 Sealed Unsealed
15 – 17.5 150 Sealed Sealed
10 – 15 300 Sealed Sealed
5 – 10 300 Double
Sealed
Sealed

End and side overlap treatment

End laps to main sheeting runs are determined according to the roof pitch and site exposure conditions. Lap sizes and corresponding sealing treatment are given in the table above.

Where wind suction forces are likely to exceed 2000N/sq.m or the length of roof slope exceeds 32m, please refer to current building regulations and procedures.

Fixings

Fibre Cement Tek Screw to Timber

Specification of the material:
Hardened carbon steel (SAE 1022)
Organic plating DUPLEX 1000
Washer: PD EPDM seal with Stainless steel washer

Fibre Cement Tek Screw to Light Section

Specification of the material:
Hardened carbon steel (SAE 1022)
Hot dip galvanised
Washer: A 22mm stainless steel EPDM seal O 25mm

Fibre Cement Tek Screw to Heavy Section

Specification of the material:
Hardened carbon steel (SAE 1022)
Organic plating DUPLEX 1000
Washer: PD EPDM seal with Stainless steel washer

To achieve a weather-tight seal, it is important to confirm that the sealing washer is correctly tightened. After a period of time when the material has settled the fixings may require further tightening with hand tools.

It is important all fixings and roof cladding are fixed using the manufacturers recommendations.