Main materials of prefab house: 1.Ground channel: c section steel, c8040152mm 2.Column: double c section steel, 2c8040152mm welded 3.Beam for second floor: steel frame 2 c8040152mm, l404mm welded 4.Sub-beam for second floor: c section steel, 2 c8040152mm 5.Purlin for roof: angle steel l404mm 6.Bracing for roof: angle steel l404mm 7.Bracing for aisle: c section steel, c8040152mm welded 8.Bracing between the columns: round steel bolt 8 9.Stairs: steel stairs 10.Wall panel: v950 50mm thickness eps sandwich panel, steel plate: 0.3mm 11.Roof panel: v950 50mm thickness eps sandwich panel, steel plate: 0.3mm 12.Floor for second story: 16mm thickness plywood 13.Rain shelter: 0.45mm thickness corrugated steel sheet 14.Windows: pvc sliding windows 15.Door: sandwich panel door or steel door.