... form C-style purlins. 5. The wall and roof are made of color steel board or color steel sandwich panels, which are connected with the purlin ... , alloy aluminium, sandwich panel and so on. Main Steel: Q345B,Q235BColumn&Beam: H-type steel, C purlin, square steel tubeWall&Roof: EPS, Rockwall, PU sandwich ,corrugated steel sheetDoor: Rolled ...