Our multiwall is a range of polycarbonate sheets - described as clear but containing fluted channels that make the sheet stronger and more resistant to impact.
The sheet is lightweight but strong, is weatherproof and aids insulation. Multiwall Polycarbonate has a long working life and is UV stabilised on one side. It carries a 10 year warranty against yellowing or fading. Multiwall is our biggest seller for roofing projects.
What multiwall thickness to use:
The thicker the multiwall, the stronger and more rigid it is. Therefore it can achieve greater distances between rafters.
- For the 10mm multiwall polycarbonate, we recommend a distance between rafters of no more than 700mm.
- For 16mm, we recommend a no more than 1050mm distance between rafters.
- For 25mm, we recommend a distance of 1050mm, but they can achieve up to 1250mm.