Why are roof trusses narrower than floor trusses
Why are roof trusses narrower than floor trusses
(OP)
I always see roof trusses with the members oriented longways vertical and floor trusses with members oriented longways horizontal. What is the driving reason for this? To allow more room for mechanical through the shallower floor truss depth?? Something to do with greater floor loads?





RE: Why are roof trusses narrower than floor trusses
RE: Why are roof trusses narrower than floor trusses
It is also easier to nail the floors on a wider truss.
RE: Why are roof trusses narrower than floor trusses
woodengineer
RE: Why are roof trusses narrower than floor trusses
RE: Why are roof trusses narrower than floor trusses
I just did a job with 26" deep flat roof trusses (2" wide) with web configuration similar to those you see in floor trusses, ie with a chase for ductwork down the middle. 30" deep should be no problem.
RE: Why are roof trusses narrower than floor trusses
flat roof trusses are normally called "flat", but have at least a 1/4;12 slope built into it.
Another thing to add to <B>woodengineer</b>'s post.... floor loads are greater than roof loading (unless alot of snow load is factored in)... and a 4x sitting on a 5.5" wall give more bearing capacity than a 1.5" truss.
RE: Why are roof trusses narrower than floor trusses
Dik