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Lap away from the weather. Overlap adjoining sheets by 1.5 corrugations with the laps facing away from the prevailing wind, so rain is driven over the join, not into it. On a 5° pitch that is 83mm of fall per metre; check it with a level before the first screw goes in, because a flat spot on polycarbonate ponds and stains.
Cleaning. Soft brush, mild soapy water, rinse. No abrasive pads, no solvents, no pressure washer on the sheet. Bird droppings and leaf litter left to sit will etch and shade the surface, so clear them when you see them. Clean from a ladder or walk boards across the purlins, never off the sheet itself; polycarbonate will not take foot traffic.
Hail warranty conditions. Ampelite covers sheet fracture from hailstones up to 25mm in diameter when accompanied by high wind, for 10 years, domestic use only. It covers replacement sheet material, not labour or incidental costs, and only where the sheet was installed and maintained to Ampelite’s instructions and AS 1562.3.
Summary only. The fixing points on this page are a summary. Installation must follow the current Ampelite fixing instructions, the label on the sheet and AS 1562.3. Requirements differ in high-wind and exposed sites.
