* Before beginning to lay out corrugated sheets, construction work (i.e. stucco, paint and gutter installation etc.) should be completed.
 
 
 
Rafter and Purlins
Before installation foreman should check all the prop and purlins to make sure attachments are safe and solid; purlin spacing should be match to the sheet length, and purlins positioned to be located at sheet end laps. Purlins should provide a straight line, this can be measured with a strained string.

Purlins can be made of batten, I bar, C, Z, U, L shaped metal, precast concrete beams. Purlin width should be minimum of 40 mm and follows the sheet slope.
 
Sheet Laps
End laps should be 20 cm when the roof slope is less than 30%, and 15 cm when the slope is more than 30%. Side laps should be 47 mm (or ~5 cm). End lap sealing strip should be used when the roof slope is less than 20%.
 
 
 
Corner Mitring
Fiber cement roofing sheets require diagonally cut corner system to avoid quadruple thickness at the overlapping point. Two sheets in the middle should be diagonally cut to prevent formation of opening which would be a passage for light and water. Uncut corners might also cause sheet deformation later on. Mitering can be done by pincers, handsaw or powered stone cutter discs and burrs should be trimmed with a rasp or sandpaper.
 
Assembly Direction
Start laying out sheets from the eaves upwards to the ridge of the roof. Direction of assembly should be opposite to direction of local prevailing wind.
 
 
 
Attachment
Nikalit® sheets and accessories can be fixed on batten purlins with wood screw, on metal purlins with hot dipped galvanized self drilling screw, on metal and concrete purlins with hot dipped galvanized bend hook bolts and nuts. (Please refer to Nikalit handbook for installation details.)
 
Pre-Drilling
Before fixing with hookbolts, corrugated sheets should be pre-drilled. Drilling can be done by hand or power drill. Do not apply percussion process. The clearance holes must be at least 2 mm larger than the diameter of the fixing. Screw or hookbolt should be used with good quality elastic washers for a watertight seal. Be sure the sealing washer is correctly tightened. Not too tight, not too loose.
 
 
Safety at Work
 
Nikalit sheets and fittings do not contain asbestos fiber and do not pose any adverse effects to the environment. Cut pieces and dust generated at the work site may be recycled or disposed of in any non-hazardous waste landfill.
 
At the work site there must be a proper access to the roof and a safe place of work should be created. Avoid stepping on side lap corrugations.
 
When roof access is necessary, roofer must use crawling boards, roof ladders or walk ways at all times. Under the roofing area a safety net should be considered as fall protection.
 
Do not stack construction materials and equipment on the roof. The roof should not be used as work platform. Avoid working directly under the roofing sheet lay out area.
 
As the work proceeds, before continuing laying out more sheets make sure previously placed sheets are fully fixed. Do not leave construction equipment or unattended loose materials on the roof.
 
In order to minimize dust generation on work site, mitering or sheet cutting can be done by pincers, handsaw or slow speed reciprocating power saw.
 








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