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• Ensure that your roof
pitch is at least 5° i.e. 88mm rise per lineal metre.
This will ensure adequate water run off.
• Allow for ventilation, particularly at the highest
point, to minimise heat build up and provide air circulation.
Good ventilation will also minimise condensation in
cold weather.
• For roofing, purlin spacings at end spans should
be no more than 800mm for Roma or 900mm fir Greca. Mid
spans should be no more than 1000mm for Roma or 120mm
for Greca. For curved structures, the maximum purlin
spacing should be 750mm and the minimum radius 3000mm.
For wall, noggin spacings should be no more than 1200mm.
Use Laserlite® Noise Stop Tape on all battens, purlins
or noggings to minimise the noises associated with expansion
and contraction.
• Ensure the label side faces to the sun. If the
label has been removed, the correct orientation of the
ink jet marking on the side of the sheet will indicate
the sun side. When installed as a wall or fence, the
life of the sheet may be shortened and discolouration
may occur due to the unprotected side being exposed.
Facing the unprotected side away from the direction
of most sun can slow this process.
• The sheet can be easily cut with a pair of shears,
a fine-toothed handsaw or a circular saw with a cut-off
blade suitable for plastic.
• In normal conditions, fix Roma and Greca sheets
on every second crest at end purlins and every third
crest on mid purlins. As a guide, you will need approximately
7 Laserlite® One Shot® fixings per line metre.
Of course this depends on your purlin spacings and wind
conditions. In high wind areas fix Roma and Greca on
every second corrugation on each purlin. It’s
also a good idea to use barge capping. Fix the sheet
through the crests for roofing and through the valleys
for walls.
• For roof laying, start with the lower sheets
first, seeping side laps away from prevailing wind.
Allow for overhang of not more than 100mm (50mm in high
wind areas). Temperature changes will cause expansion
and contraction, so make allowances for thermal movement.
Resistance to movement can cause buckling.
• Use a power drill with 5/16” hex socket.
Insert the head of the Laserlite® One Shot®
fixing into the socket.
• Firmly place the sharp point of the Laserlite®
One Shot® fixing onto the crest of the corrugation
to be fixed to eliminate “skidding” or “wandering”.
• Apply firm downward pressure, perpendicular
to the sheet and begin drilling using 100rpm and maximum
torque. Reduce the pressure once the sheet has been
pierced.
• The cutter should now cut the expansion hole.
Ensure the Laserlite® One Shot® fixing is installed
at 90° to the corrugation crest so that the cutter
cuts a circular expansion hole and the weatherseal adequately
covers the hole.
• Resistance will occur when the cutter meets
the timber purlin, indicating that drilling must stop.
Ensure the fixing has only been tightened enough to
prevent the sheet from rattling. Over tightening may
cause distortion or undue stress with possible failure
resulting.
• Ensure side laps are 15 corrugations for Roma
and 1 corrugation for Greca.
• End overlaps should be 150mm for steep pitch
or 200mm for shallow pitch.
• Repeat until installation is complete.
• For installation of roofs over 3cm in height
or for cyclonic regions, contact us for special instructions.
• Always exercise extreme care when working on
a roof. Use walking boards along purlins. Never walk
directly on the sheeting. Always wear safety glasses
or goggles when operating cutting tools or drills.
• Carefully read all installation instructions
before you start.
Click
here to read Disclaimer.
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