... the sheet twice.8. Front Side Paint Thickness: 15-25μm (bottom paint+top paint)9. Back Side ... : (Outside) workshop, agricultural warehouse, residential precast unit, corrugated roof, wall, rainwater drainage pipe, terrace, retailer booth, roller shutter ... door(Inside) door, doorcase, light steel roof structure, folding screen, ceiling, elevator, stairway, vent gutter2. ...