... serve life 2.ISO9001,BV certificate 3.Economic design ISO9001&ASTM big prefabricated construction design steel structure warehouse Qingdao Baoduo Steel Structure ... V or other type bracing made by angle , round pipe etc6.c or z purlinesize from C120~C320,Z100~Z2007 ... doors,9.accessories:semi-transparent skylight belts, Ventilators, down pipe, out gutter etc10.local natural condition:wind load, snow ...