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RE: Separation of wood from slabs in the CBC?

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I believe the code prohibits contact between untreated wood and concrete/masonry. I don’t think there is any spacing requirement. I have seen contractors coat concrete with asphalt or put felt paper between the wood and the concrete to prevent contact. I think the truss companies just put a thin metal plate between untreated trusses and the masonry/concrete bearing wall.


Christopher Banbury, PE



Ark Engineering, Inc.

PO Box 10129, Brooksville, FL 34603

22 North Broad ST, Brooksville, FL 34601

Phone: (352) 754-2424

Fax: (352) 754-2412



From: Gerard Madden, SE [mailto:gmse4603(--nospam--at)]
Sent: Wednesday, June 18, 2008 8:30 PM
To: seaint(--nospam--at)
Subject: Re: Separation of wood from slabs in the CBC?



Someone about a week or two ago mentioned that a CBC supplement was issued about reducing this 8" requirement where paving occurs.


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" from 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.? 


Ralph Hueston Kratz, S.E.
Richmond CA USA

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