Interior Bearing Wall
Interior Bearing Wall
(OP)
I have a gable roof, using metal plated wood trusses that bear on three 6" walls. Two of the walls are exterior, and the third is interior. My spans will make the truss manufacturer use three trusses per line. One piggyback to make the peak, and two across the spans.
My question is, at the interior bearing wall will the truss manufacturer butt the trusses or will he lap them? The 6" (5.5") wall surely wont allow for the butted condition will it? I dont have access to the TPI code.
My question is, at the interior bearing wall will the truss manufacturer butt the trusses or will he lap them? The 6" (5.5") wall surely wont allow for the butted condition will it? I dont have access to the TPI code.





RE: Interior Bearing Wall
Bracing of the lower trusses at the interior bearing is another issue.
RE: Interior Bearing Wall
Depending on the geometry of the roof planes, the truss designer could design the system such that you have full bearing and still have them in line. One of the trusses would have to be a "top chord bearing" truss. This truss would bear on a top plate that ran across a shortend end vertical of the other trusses.
RE: Interior Bearing Wall
Calculate the actual and required bearing needed.
Actual: 2x6 plate=> 5.5"/2=2.75"
Required for DF/SYP: MaxGravityReaction/625/1.5"width= ??
A side scab to the bottom chords over the interior bearing will distribute the reaction load even more. For higher loads and smaller bearings, the trusses can stack atop each other and/or vertical scabs can be added at the butt splice.
Too often the truss designer eliminates an oversize bearing requirement by extending a vertical web through to the bearing (Fc parallel to grain values instead of perpendicular). Unless the bearing support is steel, the problem has simply moved to crushing of the wood wall top-plate.
RE: Interior Bearing Wall
RE: Interior Bearing Wall
RE: Interior Bearing Wall
RE: Interior Bearing Wall