What thickness multiwall polycarbonate sheet should I use?

Simply Plastics offer Marlon ST Polycarbonate multiwall sheet in thickness of 10mm, 16mm and 25mm to suit different applications.

Here are some example applications to guide your decision,

10mm - Garden Pergola, Vertica privacy glazing

16mm - Gazebos, Lean-tos, Carports

25mm - Large lean-to extensions, Garden buildings