prefab house 1.fire proof; 2.water proof; 3.moist proof; 4.sandwich panel for roof prefab house1.)Board (fire proof, water proof, moist proff, etc) for the wall panel ;2.)Sandwich panel for roof;3.)Steel structure for main framework;4.)easy and fast installation, save energy material;5.)Caonfortable for family house, vocation house, etc 1.House simple structure:1.)one kids room--13.9m²2.)one ...