C & A Building Plastics have been specialists in supplying roofing sheets for over 45 years. We currently offer a wide range of roofing sheet options and specialise in the supply of plastic roofing sheets. We split these primarily into two groups, corrugated roofing sheet (wavy profile), and multiwall structured polycarbonate roofing sheet. Corrugated roof sheets are usually fixed to a structural framework (metal or timber) with support running perpendicular to the direction of the sheeting. Polycarbonate roof sheets are normally supported on glazing bars which run in the same direction as the sheet, these glazing bars are either self-supporting or designed to sit on structural rafters.