Spandek® Roof and Wall Cladding
SPANDEK® is a contemporary looking, trapezoidal profile which is ideal where a stronger, bolder, more modern corrugated appearance is required.
SPANDEK® combines strength with lightness, rigidity and economy and is available in an attractive range of colours in COLORBOND® factory pre-painted steel and in unpainted ZINCALUME® aluminium/zinc alloy coated steel.
SPANDEK® is pierce-fixed to timber or steel supports. This means that fastener screws pass through the sheeting.
You can place screws for SPANDEK® through the crests or in the valleys. To maximise watertightness, always place roof screws through the crests. For walling, you may use either crest- or valley-fixing.
Always drive the screws perpendicular to the sheeting, and in the centre of the corrugation or rib.
Don’t place fasteners less than 25 mm from the ends of sheets.
The edge of SPANDEK® with the anti-capillary groove is always the underlap (see figures on this page). It is generally considered good practice to use fasteners along side-laps however, when cladding is supported as indicated in Maximum support spacings, side-lap fasteners are not usually needed for strength.
End-laps are not usually necessary because SPANDEK® is available in long lengths. If you want end-laps, seek our advice on the sequence of laying and the amount of overlap.
ENDS OF SHEETS It is usual to allow roof sheets to overlap into gutters by about 50 mm. If the roof pitch is less than 25o or extreme weather is expected, the valleys of sheets should be turned-down at lower ends, and turned-up at upper ends by about 80o.
For maximum weather-tightness, start laying sheets from the end of the building that will be in the lee of the worst-anticipated or prevailing weather.
It is much easier and safer to turn sheets on the ground than up on the roof. Before lifting sheets onto the roof, check that they are the correct way up and the overlapping side is towards the edge of the roof from which installation will start.
Place bundles of sheets over or near firm supports, not at mid-span of roof members.
SHEET-ENDS ON LOW SLOPES
When SPANDEK® is laid on slopes of 5 degrees or less, cut back the corner of the under-sheet, at the downhill end of the sheet, to block capillary action.
MAXIMUM ROOF LENGTHS FOR DRAINAGE MEASURED FROM RIDGE TO GUTTER (M)
Penetrations will alter the flow of water on a roof. For assistance in design of roofs with penetrations, please seek our advice.