... 2.Hard and Durable 3.Environmental-friendly 1)Item name: building material steel frame,steel structure steel frame,portal steel structure2)Specification ... you can inform us the followings :A)Size for the building :Length , width, heightB)Doors and windows :size ,quantities,where ... snowload,earthquake (take any other serious weather into account)D)material for wall and roof : EPS,PU,PVC or sandwich ...