Column and beam Welding steel or hot-roll steel Steel surface treatment Hot-dip galvanized or painted(all colors we can do) Steel grade Q235,Q345,ASTM,EN10225 Purlin and girt C and Z section steel Conection Method All bolt connection,easy installation Wall&Roof Sandwich panel with EPS or Rockwool insulation Wall&Roof Metal sheet with blue,red,whitegrey color or customize Door Rolling shutter door or Sandwich panel sliding door Window Plastic steel or Aluminum alloy window Bolt and nuts High Strength Bolt and ordinary bolt Design life span 25 years and 50 years Place of origin Qingdao city,Shandong province, China (Mainland) Business type Manufacture and trading Packaging Details Bunding with pallet or customize