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Let’s get started. The first building system we were going to talk about concerns the use of steel trusses. The steel truss system has been very popular for many, many years in the construction of bridges (as well as various buildings).Using steel roof trusses are a very economical, cost efficient method of achieving clear-span applications up to 140 feet. Furthermore, steel trusses have an advantage in that they can be designed with double slopes deepening the middle section. Steel trusses depend on metal horizontal roof diaphragms and wall bracing for lateral stability. In today’s single steel truss approach, a column in the truss work is erected first, followed by connecting the truss to the columns.