Can continuous lateral braces in roof trusses be drilled without weakening them?
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Answers:
If you are using the term "continuous lateral braces" correctly, you mean the wood pieces (usually 1x4 or 2x4) that run perpendicular to the trusses, and are attached to each truss, usually at the webs of the truss (the diagonals that run from the roof to the ceiling.
If this is the piece you are talking about drilling, I can't see any reason not to, but first I would have to ask: 1] Why are you drilling a hole in it, and 2] how big of a hole do you need to drill? If you will post additional information, I'll try to be more help.
The rule I was taught is do not take more than a third of it out, and do not notch without installing stud guards (iron stud plates).
but if you are talking an existing unit, you may can drill out more and the unit or house will maintain it's strenght.
not recomended but if you have to drill near the ends or where a wall supports the truss
no it can cause problems with snow or wind
Careful! Trusses are engineered components which are part of an even bigger engineered system (the roof). Very complex load paths. Some components are in compression, some are in tension. None can be significantly altered without compromising the truss. Small holes for wiring is okay. NEVER break an edge! (called cutting the chord) If you damage the truss, it may need replacing. Not an easy or inexpensive thing to do.
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