16mm polycarbonate sheets are suitable for building many structures including carports, unheated conservatories, walkway roofs and many more, it has the advantage of extra rigidity over 10mm polycarbonate allowing for larger spans between rafters. 16mm polycarbonate sheets are in our opinion the best balance between strength and cost for a carport and is why we use it in our dedicated Sanctuary Canopy roofing system. Specification: Weight = 2.5 kg / sqm Insulation U Value = 1.8 Light Transmission: Clear 74% Bronze 40% White 47%