Trimming openings for stairs dormer and roof windows in I beam constructions

With traditional construction using natural solid timber joists and rafters, general advice can be seen as illustrated in Fig. 3.18b. For engineered timber joists and rafters, the trimming must be designed as part of the whole floor diaphragm, or roof slope construction, with components selected, detailed, and manufactured to fit. The use of special metal hangers designed to carry the larger profile of engineered components plus cleats, fixings and correct nailing or bolting is essential. For that reason it is not possible to cover in this text every manufacturer's detail but typical techniques can be seen in Figs 4.7 for floor diaphragms and 4.8 for roof structures.

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