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RE: shear ply over gypsum

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Thanks for the reply. The impetus to my post was that the contractor built a
property line wall contrary to my detail. I show ply on framing, then gyp,
then siding. He built gyp on framing, then ply (4-ply, I asked for 5 ply).
Anyway, if he bumps up the nailing it figures based on the 94 code. Its a
long uninterrupted wall, so I am leaning toward allowing the wall as is with
more nailing.


Jeff Smith

-----Original Message-----
From: John Rose [mailto:jrose36(--nospam--at)]
Sent: Wednesday, April 07, 1999 7:20 PM
To: seaint@seaint
Subject: Re: shear ply over gypsum

Yes, it's in the wood structural panel shear wall table. Includes 5/8" gwb
(Type X or C gwb used for fire-rated walls).  A better structural solution
be to use wood structural panel sheathing directly attached to framing, with
over; it's permitted for fire-rated walls by footnote to fire-rated walls in
Chapt. 7 table.  Siding of any type could be installed over the gwb (e.g., a
three-layer wall on the exterior side). It's UL Design U344 for one-hr. fire
resistance from either side.  City of LA amendments for 97UBC will delete
provisions for using wood structural panels over gwb until cyclic tests
acceptable performance.

John Rose/APA, Tacoma, WA

Jeff Smith wrote:

> Can anyone tell me if the 97 code allows shear walls with shear plywood
> 1/2" gyp. (I have not picked up the new code yet)
> Jeff Smith