They have two outer layers with a core from polyurethane foam inside. This sandwich panel corrugated sheet make them pretty strong and really good for keeping heat inside or outside. Lots of people ask about the price of these panels because they take big part of building expenses.
Benefits
Their insulated sandwich roof panels of several things. First thickness matter a lot. Thicker ones cost more usually because better insulation and more strength. Also type of material used important. GLOSTAR use high quality insulation and strong layers for durable panels.