How To Fasten Polycarbonate SheetsLast Updated: February 19, 2019
It is important to choose the correct fastener for your specific application. We recommend using a #12 woodmate screw for wood and a #12 self-drilling screw for metal, such as aluminum or steel.
Fasteners should penetrate the roof or wall of your structure by at least one (1) inch.
- No polycarbonate profile is designed to be fastened down. Attachment points should be through polycarbonate sheets.
- Fastening should be done one to two inches away from the edge of a polycarbonate sheet.
- If fastening to a purlin, leave 6” of room from the edge profiles to connect.
- Overtightening screws can cause leaking and weaken the strength of a sheet.
- Fasten until the Neoprene galvanized washer is sitting flat/flush to the sheet or profile. Tight enough to not be moved out of position but not depressed into the polycarbonate sheet.
- Predrilled 1/16” larger than the fastener being used (this allows for thermal expansion)
- Drilling should be done through an aluminum profile and/or sheet and into the structure (rafters or purlins) to which it will be fastened.