... :2008,CE*Material: Q235B,Q345B*Finish: Hot dip galvanized,Spray painting,Power coated,black steel*Dimension: Various type, diversity design,according to ... very helpful:1.The total area, the dimension (length, width, eave height, etc.)2.Roof structure style: slope style or curved style ... ).snow load (Kn/M2) if have4).earthquake load if have Light steel structure