... beam/girder, steel column/pillar), the secondary structure( roof and wall purlin, steel bracing, tie-bar, etc), door and windows, and ... normal conditions.D. You can choose freely the roof and wall panel, included both types:a. Heat-Insulating material( EPS, Glass wool ... freely the material of door and windows( Aluminum alloy and PVC)F. We also have so many accessories, for example, steel ...