Graphical Construction Glossary >> Roofs and roofing. >> Roof Framing >> fly brace

Fly brace
A brace from the bottom flange of a rafter to a roof purlin that restrains the rafter laterally.

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.

fly bracing

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Please Note! The information on this site is offered as a guide only!  When we are talking about areas where building regulations or safety regulations could exist,the information here could be wrong for your area.  It could be out of date!  Regulations breed faster than rabbits!
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