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- Subject: Re: FNDN: Residential fo
- From: Roger Turk <73527.1356(--nospam--at)compuserve.com>
- Date: Tue, 6 Jan 1998 18:23:10 -0500
I would tend to put the foundation well below the frost line as Bill Allen is considering. After all, how accurate is "frost depth" anyway? While frost depth is not a consideration in most places here in Arizona, there are mountain locations and higher elevations where frost depth is/should be a consideration. When I have contacted agencies such as the Soil Conservation Service, Forest Service and Weather Bureau, as well as building departments, to find the frost depth in certain areas, they acted as if they didn't know what I was talking about. As a result, I use a minimum footing depth of 48 inches where frost depth is unknown and I know that the ground will freeze. If the building is a slab-on-grade residence, then I would not see any need to extend the interior footings below frost depth. However, if the first floor is elevated and the area under the floor is well ventilated or open so that the temperature in the underfloor area can go below freezing, then I would also extend the interior footings to the same depth as the exterior footings. A. Roger Turk, P.E.(Structural) Tucson, Arizona
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