... you needed.1. Ground channel: C section steel, C80×40×15×2mm2. Column: double C section steel, 2C80×40×15×2mm ... 2mm, L40×4mm welded4. Sub-beam for second floor: C section steel, 2 C80×40×15×2mm5. Purlin for roof ... for roof: angle steel L40×4mm7. Bracing for aisle: C section steel, C80×40×15×2mm welded8. Bracing between the ... windows15. Door: sandwich panel door or steel door prefab modular homes for sale