Holes in Wood Truss
Holes in Wood Truss
(OP)
Asked to look at a lightweight wood roof truss that contractor drilled a 1" diameter hole in the bottom chord near top and at mid span. Bottom chord is a 2x8. Are there any manufacture or code requirements such as in traditional wood beams? I plan on analyzing truss with loss of section, but would like to know if there are any standards or rules of thumb.
Thanks
Thanks





RE: Holes in Wood Truss
RE: Holes in Wood Truss
I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.
RE: Holes in Wood Truss
There are no simple "rules of thumb" for how much cord area can be removed. As you already mentioned, the only thing you can do is calc the BC with the reduced section at that point.
Do you know why there's a 2x8 BC on that truss? Maybe for storage loading?
Looks like the TC is a 2x4, so it's not an exceptionally long span.
RE: Holes in Wood Truss
Dik
RE: Holes in Wood Truss
RE: Holes in Wood Truss
Dik
RE: Holes in Wood Truss
RE: Holes in Wood Truss
...
Mike Halloran
Pembroke Pines, FL, USA
RE: Holes in Wood Truss
BA
RE: Holes in Wood Truss
I'm pretty sure it's typical SYP lumber. What you're seeing on the bottom edge of the BC is just the edge of the growth rings.
Someone said: "The factory fabricated truss market is so competitive that there is little or no redundancy."
That's is not remotely true.
RE: Holes in Wood Truss
I always thought that the fabricated truss market was super competitive with little redundancy as well.
Could you share any background info you may have on the industry?
Thanks,
S&T