What type of screw for polycarbonate roofing?

There are many different types of roofing screws. So which one should you use? This video shows you what type of fastener you should be using for your polycarbonate, acrylic, Plexiglass, Perspex, Twinwall, multi-wall, plastic or PVC roofing. You can't use a standard roofing iron screw as it doesn't have a big enough washer. You also can't use standard screws as they don't have any washer at all, so your roofing will leak. The key thing is all plastic or clear roofing requires an expansion hole. This is to allow for the thermal expansion and contraction that takes place with the sheets. If you don't have an expansion hole, the roofing will start to crack where the screws are. We sell the One Shot and Multipurpose fasteners for corrugated and profiled roofing. These drill their own expansion hole. They're 50mm for corrugated or Greca, and 65mm for 5-Rib (a product with a taller ridge). We have Weatherlock fasteners for Custom Glaze. And we have Twinwall fasteners for the Twinwall or Multiwall products. 0:00 Intro 0:14 What not to use 1:14 Profiled roofing 2:57 Twinwall roofing 3:17 Flat solid roofing Hopefully this is helpful. If it is, please like and subscribe! Sunnyside Outdoor Roofing and Shade DIY tips for building pergolas, awnings, blinds, outdoor shade and more. If you're looking to buy great value polycarbonate and acrylic roofing, outdoor blinds, shade sails, and retractable awnings, you'll find it at Sunnyside. In business since 1966, with delivery throughout NZ. https://sunnyside.co.nz 09 390 4414