Graphical Construction Glossary >> Roofs and roofing. >> wind brace
The old timber wind bracing as shown in this sketch, using say 150 x 35 to 100 x 50, is just about redundant. It relies on the fact that there is a convenient hanging beam under the ridge. Another way of doing it was to nail diagonal timber bracing to the underside of the rafters.
The modern way of doing it is to use galv. metal straps. These are 35 x 1.2 thick and slightly crimped to keep them straight. Before the pre-made versions were available hoop iron strap was used that came in rolls. It was a devil of a job getting them tight!
I guess that the ultimate form of this type of bracing is the whole surface of the roof being sheeted with shear ply. As is the case when roofing shingle are used.
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