Houses are generally built with loadbearing external wall structures where the inner skin of the external cavity wall (or timber / steel frame) carries the load from the roof and upper floor. Roof loads are transmitted through the inner leaf or frame from the point of connection of the roof to the wall. This connection is key to the satisfactory performance of the roof / wall combination. It should be remembered that when dealing with roofs the normal procedure is to divide this element into two parts: the structure and the covering. Both of these component parts require strength, and we will review each in turn.
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