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Re: sub floor footing

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Dave,
 
Section 2606.3 of the 1997 UBC allows girders closer than 12" to exposed ground in crawl spaces provided they are treated to resist decay.
 
However, someday, someone is going to need to crawl under the house.  I used to be able to crawl under 10" -- my minimum is probably closer to 11" now.  12" is comfortable enough.  Keep us guys who work on existing buildings in mind.
 
Nels Roselund
Structural Engineer
South San Gabriel, CA
njineer(--nospam--at)att.net