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Re: WOOD - Load bearing studs in a party wall

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Don't think that studs don't buckle in plane. I once worked on a commercial
remodel project where the interior bearing wall was to be removed and
replaced with a steel beam. I specified that "the 2nd floor shall be
shored", but I pretty much left the methodology up to the contractor. He
built a stud wall w/o any sheathing or diagonal bracing. Good thing I was
there or about a dozen laborers would have been killed. I walked in and all
of the studs had a visable "bow" in them. I quickly had the contractor use
his lifts to pick up the steel beams and take the load off of the "shoring".
I had the framer install diagonal bracing, nailed to each stud, on every
wall.

Believe me, the l/d issue is a real thing.

Bill Allen
-----Original Message-----
From: Jeff Smith <smthengr(--nospam--at)sirius.com>
To: seaoc(--nospam--at)seaoc.org <seaoc(--nospam--at)seaoc.org>
Date: Wednesday, October 22, 1997 8:33 PM
Subject: Re: WOOD - Load bearing studs in a party wall


>Bill said:
>>Well, that's WAY too conservative.
>
>Oops...your right,  you should have an l/d less than 50. There is no
>question that gyp on one side provides a level of bracing in the weak
>direction. However, I could not find any reference info on this as I am
>sure you already found out. ( I checked Breyer and Hoyle and they both only
>address walls with sheathing on both sides.)  With the old rule of thumb of
>lateral restraint equal to 2% of the axial and say 1000# per stud you would
>need only 20# restraint. Between the romex and some tightly stuffed
>insulation you should almost make it. I have never heard of a buckled
>bearing wall stud, yet I have seen compression of the plates due to
>overload.  Now look what you started Bill  ;^)
>
>The idea of adding blocking or bridging or wiring for that matter is going
>to compromise the sound control by connecting the isolated party wall
>studs, thats why the studs are staggered. Of course the top and bottom
>plates already are doing that and the floor will transmit ITC (?) sound
>across the wall.  Frankly, I do not have a lot of faith in a staggered stud
>wall to reduce sound transmission, other that the fact that it is a thicker
>wall.
>
>Jeff
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