... weight; High strength; Quickly assembled & dismantled; Recyclable steel Large span steel structure workshop is third generation construction, which adopts ... about 20~50 years in good maintance.Specification: SizeLength*Width*HeightColumn and beam Materials of Q345 or Q235, ... Rock wool,PU,etc.,insulation thickness of 50mm--150mm,width of 950mm or 960mm.AccessoriesSemi-transparent skylight belts, ...