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RE: House and detached garages on 24" slab

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Title: RE: House and detached garages on 24" slab

From an economical $tandpoint, Brian is correct.  In these situations, we use a ribbed mat "raft" foundation with 12"x 24-32" beams at 16-20ft spacing poured monolithic with a 4-5" slab.  Do it all the time for Corps of Engineer projects in expansive soil conditions.  In fact, COE has a computer program that calcs both edge lift(positive beam moment) and center lift (cantilever beam moment) conditions for the expansive properties of the soil.  Input parameters come from geotech investigation and lab test values.

a 24" slab would be ridiculously expen$ive and unnecessary IMHO