... insulation 5Low cost Energy-saving low cost prefabricated modular house/sandwich wall panel (Manufacturer)is a kind of light weight energy saving ... red brick, clay solid brick, air brick, color-coated steel sandwich board, gypsum block, wire spatial grid structure perlite board, ... m3, just one sixth of the brick buildingComparison of inner wall panel 75 and 120mm it will increase 12m practical area, ...