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IBC Table 2306.4.5 - Gypsum sheathing

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Title: IBC Table 2306.4.5 - Gypsum sheathing

From the AF&PA 2005 Special Design Provisions for Wind and Seismic: Gypsum Sheathing: Four-foot-wide pieces
of gypsum sheathing shall be applied parallel or perpendicular
to studs. Two-foot-wide pieces of gypsum
sheathing shall be applied perpendicular to the studs.
Gypsum sheathing shall conform to ASTM C 79 and
shall be installed in accordance with ASTM C 1280.

Here's a link to the standard:



John "Buddy" Showalter, P.E.
Director, Technical Media
AF&PA/American Wood Council
1111 19th Street, NW, Suite 800
Washington, DC 20036
P: 202-463-2769
F: 202-463-2791

The American Wood Council (AWC) is the wood products division of the American Forest & Paper Association (AF&PA). AWC develops internationally recognized standards for wood design and construction. Its efforts with building codes and standards, engineering and research, and technology transfer ensure proper application for engineered and traditional wood products.

The guidance provided herein is not a formal interpretation of any AF&PA standard.  Interpretations of AF&PA standards are only available through a formal process outlined in AF&PA's standards development procedures.


From: "Ed Tornberg" <ed(--nospam--at)>
To: <seaint(--nospam--at)>
Subject: IBC Table 2306.4.5 - Gypsum sheathing

I can't seem to find a referenced standard or definition of "gypsum sheathing". Is there one? I assume this is GWB reinforced with more than just paper facing.

In the past, if I used this type of material, it was proprietary and I relied on an ICC report for shear values.
Ed Tornberg
Tornberg Consulting, LLC