Originally Posted By: roconnor
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Gerry … the question is a little sticky.
IRC R323.1 would require 8" clear to untreated wood sills (sills are usually not treated) in many areas subject to decay. That includes coastal regions on the west coast, and almost the entire eastern half of the US except for areas in the northeast very close to the Canadian border.
IRC R404.1.6 would apply for wood sills in areas not subject to decay, or where treated sills are used. That is also often quoted as the minimum amount of foundation "exposure" required, or clearance to the siding (6" clear to the siding is also recommended by many siding manufacturers). So both the sills and siding would need 6" clear in that case.
That may be why you have heard both 6" and 8" quoted as the required clearance to the sills (but not for siding that I am aware of ... that is usually 6" recommended).
Just my 2-nickles
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Robert O'Connor, PE
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