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RE: UBC/IBC: Question re CFS with Gypsum Board Sheathing (Shearwall)

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Bill,
If the gyp board is on the outside face of the wall and taking wind out of plane you will have a hard time finding a gyp board that is rated for pressures. I would recommend talking the client into dense glass, it has around a 75psf out of plane pressure rating and also has good shear capacity. Also has class A fire rating and termites do not like it. Flat straps in CFS are never taught and are never properely terminated to a diaphragm so in my opion they are worthless. I do not recommend using them as a tension brace for stud out of plane bending at midpoint or whatever point. Design for full height unbraced struds based on construction loads then get the sheathing on for continuous braced in weak direction for total load.
James
fellow Houstonian


From: "Bill Polhemus" <bill(--nospam--at)polhemus.cc>
Reply-To: <seaint(--nospam--at)seaint.org>
To: <seaint(--nospam--at)seaint.org>
Subject: RE: UBC/IBC: Question re CFS with Gypsum Board Sheathing (Shearwall)
Date: Thu, 25 Jul 2002 08:15:15 -0500

I don't think seismic is a problem. The job's in Houston, and until we go to
IBC, I'm STILL going to pretend seismic doesn't even exist.

Wind speed is 110 mph, though.

William L. Polhemus, Jr. P.E.
Polhemus Engineering Company
Katy, TX, USA
Phone (281) 492-2251
FAX (281) 492-8203
email bill(--nospam--at)polhemus.cc

-----Original Message-----
From: Jake Watson [mailto:jwatson(--nospam--at)utahisp.com]
Sent: Thursday, July 25, 2002 7:48 AM
To: seaint(--nospam--at)seaint.org
Subject: RE: UBC/IBC: Question re CFS with Gypsum Board Sheathing
(Shearwall)

Be aware, GDW is not allowed to resist seismic forces when applied to CFS.
It must be on wood per the IBC.  Read the table headings a little more
closely.  You won't find GDW in the seismic table.



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