... architecture, office block, several park and family house etc. 5) One point more worth noting is that all of the steel ... height, roof slope 2)Type: Single slope, double slope, muti slope; Single span, double-span, Multi-span, single floor, double floors! 3) Base: Cement ... -section or Variable cross-section! 5) Bracing: X-type or V-type or other type bracing made from angle, round pipe, etc 6 ...