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RE: Separation of wood from slabs in the CBC?

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I think the exception implies that it applies to siding, sheathing, and
wall framing:

"...except where siding, sheathing, and wall framing are of naturally
durable or preservative-treated wood"

Since the siding is presumably the lowest point of the three, that's
where it would be measured from.


From: "Acharya, Suresh" <Suresh.Acharya(--nospam--at)>
To: "'seaint(--nospam--at)'" <seaint(--nospam--at)>
Subject: RE: Separation of wood from slabs in the CBC?

Are we talking about ***SIDING*** or ***SHEATHING***?
I have not seen the supplement, but the existing section 2304.11.2.6
already allows 6" clearance to wood ***SIDING***. Section 2304.11.2.2
does require 8" clearance to wood ***SHEATHING*** and FRAMING [except 6"
is ok for DSA/OSHPD projects when concrete slab or asphalt paving

Suresh Acharya, S.E.

-----Original Message-----
From: Showalter, Buddy [mailto:Buddy_Showalter(--nospam--at)] On Behalf Of
AWC Info
Sent: Thursday, June 19, 2008 6:18 AM
To: seaint(--nospam--at)
Subject: Separation of wood from slabs in the CBC?
There's a new section added in the 2007 Supplement to the 2006 IBC as
2304.11.2.5 Wood siding. Clearance between wood siding and earth on the
exterior of a building shall not be less than 6 inches (152 mm) or less
than 2 inches (51 mm) vertical from concrete steps, porch slabs, patio
slabs, and similar horizontal surfaces exposed to the weather except
where siding, sheathing, and wall framing are of naturally durable or
preservative-treated wood.
Although I think the section number should be 2304.11.2.6 to be
consistent with the current code.
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.
On Wed, Jun 18, 2008 at 2:04 PM, <Rhkratzse(--nospam--at)> wrote:
> Can anyone help me find the requirements in the Calif. bldg. code for
> required separation of untreated wood from slabs on grade? It's 8"
> exposed earth (2304. but I don't find the similar
requirement for
> distance from a slab.
> Also, is anything other than a concrete slab adequate to allow
reduction of
> the 8" distance? Gravel, loose pavers, brick pavers, etc.?
> TIA,
> Ralph Hueston Kratz, S.E.
> Richmond CA USA

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