Graphical Construction Glossary >> Roofs and roofing. >> Roof Framing >> fly brace
In the photo above the white braces are bolted to the bottom chord of a Pratt girder roof support, via a welded cleat. Normally in a position like this the brace is bolted to the steel Zed purlin though the overlap fixing bolts to take advantage of the extra stiffness as shown in the photo below.
A steel angle, say 50x50x5 is commonly used though both of these example show smaller angles being used.
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