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vertical load transfer at wood floor truss bearing

vertical load transfer at wood floor truss bearing

vertical load transfer at wood floor truss bearing

(OP)
When using the floor truss bearing detail with a 2x band at exterior walls, how do you account for vertical load transfer.  With a full-depth continuous rim the load from above is somewhat uniformly distributed to the 2-2x top plate and wall studs below.  With the 2x band detail the load from above is "collected" into the ends of the trusses and is transferred onto the 2-2x top plate below as a point load.  If trusses do not align with studs this can cause the 2-2x top plate to be overstressed for 2-story and larger buildings.  I would appreciate hearing how some of you have handled this.

RE: vertical load transfer at wood floor truss bearing

With 2-2x4s or 2x6 top plates and studs at 16'' oc - I haven't run into a problem.  But I suppose you could.

If the plates are well nailed together - you almost get a composite action - so you are looking at a section that is close to a 3.5 x 3'' deep - but maybe not quite.

Also - the chance that you will get full live load is almost impossible.

While I am not dismissing your concerns - I have have never seen this as a problem.

Good luck

RE: vertical load transfer at wood floor truss bearing

When I got to a point where a continuous double top plate could not handle the per stud point load in bending, I called for crush blocks at each stud location.  Contractor wasn't a huge fan but in a 4-story building, the loads add up pretty quickly.

RE: vertical load transfer at wood floor truss bearing

Sorry - I assumed a 2 story buidling maxx.  But at four stories - yes you could have a problem.

1.  Go to a triple plate
2.  Make sure your studs and floor trusses line up.  Make sure studs are fully sheathed.
3.  Drop spacing to 12'' oc if necessary

RE: vertical load transfer at wood floor truss bearing

(OP)
I ended up requiring that the Contractor align a stud below each truss and requiring that the truss manufacturer/designer design the ends of the trusses to transfer this accumulation of load through the ends of their truss since this is the only vertical load path.  There were a couple locations even at two stories where I couldn't get the top plates to work (long spans, floor and roof trusses both at 24" on center).  Thanks for the replies ... I was just curious to see how others were handling this.

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