Wood Truss
Wood Truss
(OP)
Got a wood truss spanning about 25', its about a 6:12 pitch. Is there a rule of thumb for the span/pitch and deflection? There is a wall at the center of the truss below, but I would not expect it to be load bearing, especially since over doorways, they didnt put headers in. Just wondering if they would have a wall to limit deflection?






RE: Wood Truss
Creep can be up to 1/2 LL deflection
RE: Wood Truss
RE: Wood Truss
(Very)General rule of thumb is X' span, X" deep. So 25' span needs 25" depth. You should have 6', so rock and roll.
When I am working on a problem, I never think about beauty but when I have finished, if the solution is not beautiful, I know it is wrong.
-R. Buckminster Fuller
RE: 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: Wood Truss
RE: Wood Truss
RE: Wood Truss
Thanks
RE: Wood Truss
RE: Wood Truss
DaveAtkins
RE: Wood Truss
In long-span situations, I've designed many buildings that have had intermediate (center) bearing points. Often, the truss manufacturer prefers it which, reportedly , would keep the cost down since they could avoid what would otherwise require a 2x8 or 2x10 bottom chord.
I've seen this in smaller-span residential construction where the general contractor told me these are cookie-cutter houses that have previously been estimated and the material bill is constant.
I've also seen this in smaller-span construction where i suppose deflection wasn't an issue. I also assume this was common practice in older construction where large spans were not in demand as today.