Polycarbonate twinwall sheet is known for its outstanding durability, light transmittance, and clarity. It is easy to install and features high impact resistance. Twinwall is UV-resistant - it will not become discolored and only allows beneficial light to pass through. It is a great choice for greenhouses, light transmission applications, architectural design, roofing and windows, and hurricane and storm window/roofing protection. Twinwall weighs up to twelve times lighter than glass and is flame retardant.