The hollow structure of multiwall polycarbonate means it is much lighter in weight when compared with glass. For example:
The following figures for light transmission are based on 16mm triplewall sheet; the figure will increase or decrease depending on the thickness of the sheet.
Because of its unique multiwall construction, polycarbonate glazing provides excellent thermal insulation when compared with glass. This can result in massive energy savings. It also provides better levels of comfort for people working beneath it as cold draughts are eliminated.
The U value ratings for the popular thicknesses of multiwall polycarbonate read as follows: