3TREES's molded polystyrene boards can reach B1 (refractory) combustion grade. With a thermal conductivity of <0.039, they can meet the 75% energy-saving standard for frozen and cold areas. Thanks to their good air permeability, the boards can greatly reduce condensation on buildings and prevent mildew. Featuring light system weight and mature technology, 3TREES’s molded polystyrene boards can effectively avoid falling-off and cost less than polyurethane board systems.