Excellent thermal insulation • Highly flexible, yet virtually unbreakable • Lightweight and easy to install • Rigid sheet structure provides extra strength under wind and snow loads. To see sheet performance under loads, go to “Support / Wind Load Charts”. • Recommended Uses: Covering of medium span structures where excellent thermal insulation is required. Polygal Standard Sheets feature a UV protective layer to protect against yellowing, and are covered by a 10 Year Warranty against breakage and yellowing (6 mm and higher).