... 50mm~150mm, width 950mm or 960mm!h)Accessories: Semi-transparent skylight belts, Ventilators, down pipe, outer gutter, etci)Surfrace: Paint or ... :A)No sandwich panel siding we are going to use concrete blockB)Change roof to 26 ga galvalume not the sandwich insulated panelC ... steel,BS5950,50 Grade,British Standard;3. The roof bracing system adopts hot-rolled square tube and circular tube , BS5950,50 ...