... -span ,Multi-span, single floor, double floors3.base:Concrete and steel foundation bolts4.column and beam:material Q345(S355JR)or Q235 ... (S235JR) steel, all bolts connection ,straight cross-section or Variable cross-section5 ... 6mm thick ,YX51-380-760(760mm wide),single colorful corrugated steel sheet0.376~0.6mmthick ,YX51-470(470mm wide),sandwich panel ...