stegmehrfachplatte from polycarbonate, suitable for hard roofs, as well as the stegmehrfachplatte containing, large or small roofing

摘要

A polycarbonate girder joist with multiple openings has upper and lower surfaces (1) at least 3 mm thick, with intermediate webs (2) at least 2.5 mm thick. The webs are at intervals (a) of max. 40 mm. The girder joist has a height (b) of at least 30 mm. At least one side is coated with a plastic containing an ultra-violet absorber.