... steel components, roof and walls using a variety of panels and other components such as windows and doors. Light ... Q345SurfaceHot-dip galvanized or PainedRoof and wall panelEPS,PU,Rockwood sandwich panelWindowPVC or Aluminum AlloyDoorSliding or Rolling up doorCost-effectiveFast ... roof are made of color steel board or color steel sandwich panels, which are connected with the purlin by Self-tapping ...