1:Meterial:SPF-J(spruce) 2:Size:the dimension can be customized 3:Thickness of the wall: 36mm or customized Prefab house, KD design. Size: the dimension can be customized. Material:Pine, Suffocating treatment,steam treament, 30 years wood warranty.Thickness of the all wall: 36mm or customized.Thickness of the floor board: 18mm.Thickness of the roof: 20mm, include the windows, doors, base timber, ...