I’m building a work shop 1 story 2×6 framing 16 inch on center 28 x 40 foot footprint. And I was told that when I put down the roof trusses that they have to be place directly above a stud. The truss co. told me to place the trusses 24 inch on center. I put this same question on another site. And I got an answer that ever other stud would have a truss on top. Is it just me or does it seem that math doesn’t come out right? Maybe 1 every 48 inches. Anyhow do I have to have a stud underneath. 9 foot walls. Thanks Tim
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If using #3 studs or better you can space the studs 24" oc when supporting roof and ceiling only (table R602.3(5) IRC ). Centering the studs under the trusses is good building practice, but the trusses have to be within 5" of a stud when trusses and studs are spaced 24' oc.
Slash,
So does that mean that there is a 3" "no man's land" between the studs (14-1/2" space, 5*2=10, 4.5" left -1.5"? Wouldn't 24" oc trussed land right in this space over 16" oc studs?Jon Blakemore
Are you framing with one top plate, or two?
Two top plates. Tim
As long as you layed out the bearing walls from the same end of the building, and you lay out your trusses from that end as well, every other truss should land directly over a stud. That's the way most houses are framed out here in Western Washington. I'd be astonished if a building official objected to this technique. But we haven't adopted the I.R.C. yet either, so maybe I shouldn't say anything.
I agree with Jim. I've never had an inspector make an issue of it. They WERE attentive to splice overlaps on the double top plates and a splice falling between studs having a splice block.
I've worked off plans that referred to trusses or rafters aligned over studs as "advanced framing." I thought that terminology was kind of silly because I didn't see anything particularly "advanced" about it even though the practice itself made sense.
I've only seen one or 2 buildings in my lifetime that had the stud spacing same as the truss spacing. Studs 16" O.C. and trusses 24" O.C. are the norm everywhere I've been.
But - No way would we know if your local codes might say otherwise. Make sure you check that out, and save yourself some nasty surprises.
I checked ith my local building department. And they said that to them it did not matter. Because it is enough on the two top plates. And plus the the 2x6's at 16 inch o.c. They are building some new houses around me and they are using the same pratice. I live in Calif. Bay Area. It seems here they are more worried about withstanding an earthquake then anything else. Thanks Tim