light steel structure house: 1.Good Strength, 30years serve life 2.ISO9001 ... ,moden design. ISO9001&ASTM pre-engineering steel structure workshop/light steel structure house /warehouse construction Qingdao Baoduo Steel Structure CO.,LTD.Main Grade: Q345B ... typesingle span,double-span ,Multi-span,single floor,two story or muti-storey3.basecement and steel foundation anchor bolts4.column and beammaterial ...