Temporary bracing for small trusses
I’m installing standard trusses with a 20′ span, 2′ overhangs, and a 4:12 pitch for a simple gable roof. The truss drawings indicate that the only permanent bracing needed is sheathing on top and a drywall ceiling directly attached on the bottom, both of which I’ll install. The generic installation instructions, BCSI-B1, a single-sheet document delivered with the trusses, however, call for five different types of temporary bracing: lateral and diagonal on the top chords and bottom chords plus diagonal bracing across the verticals in the web, which is the one I understand completely, as it it prevents racking that could otherwise easily occur right away. If I were going to climb around on the trusses before they’re sheathed, I could see why more bracing would be needed, but I’m planning to install the first row of sheathing, in full 4×8 sheets, on each side from a ladder and then each subsequent row from atop the sheathing already installed. The much longer BCSI booklet on truss installation frequently says to refer to the truss drawings. I would not take any chances with safety, but if some of temporary bracing in the installation instructions won’t be of any benefit for trusses as small as mine that I won’t be climbing upon and that don’t require any additional lumber for permanent bracing, I’d rather save whatever time, wood, and nails I safely can. In real-world practice, for small trusses like mine, which of these five types of temporary bracing are actually installed?
GBA Detail Library
A collection of one thousand construction details organized by climate and house part