... cost Energy-saving low cost prefabricated modular house/sandwich wall panel (Manufacturer)is a kind of light weight energy saving compound board ... red brick, clay solid brick, air brick, color-coated steel sandwich board, gypsum block, wire spatial grid structure perlite ... 120mm it will increase 12m practical area, for 100m2 house, it will increase 4.16m2Waterproof and damp resistantWith fireproof ...