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- To: <seaoc(--nospam--at)seaoc.org>
- Subject: underpinning
- From: billw4(--nospam--at)pbs1.com (Williston Warren IV)
- Date: Sat, 29 Nov 1997 13:17:55 -0800
Bill Allen, The addition of a second floor could be included with a geotechnical investigation that provides greater than the code value bearing capacities, but to obtain these "higher" values a rather greater than normal investigation could be required. Our experience has been that goetechnical investigations for residential work, that the owner wants to pay for, are about $3,500. This fee really does not allow enough investigation for the Geotech to provide significantly higher bearing values. Our experience has shown that this $3,500, larger than the structural fee?, includes a couple of shallow test pits and testing of the recovered material. Chances are, depending upon the date of the original construction, with the higher design bearing values the footings now are inadequate for bending criteria. Consider the assumed maximum span of a typical code prescribed footing (reinforced or not) would have over a "soft" spot for one story loads, and now consider the impact upon the footing when the load is increased and the implied span is still required. Bill Warren, S.E.
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