... rockwool,metal. 2. cheap, economical building material 3.used for dorm, office, warehouse, fence, factory,workshop Widely used in ... environmental friendly,can be recycle. Applicationswidely used as roof and wall panel in warehouses, factories, exhibition halls, prefabricated houses, ... PU rockwool color coated steel plate Sandwich Panel colourbond for roof wall fence prefab house and steel structure