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Re: Expansive Soil Foundation

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The siols report should specify the expected differential expansion.  IMHO
this will probably be mor than just adding a few rebar.  I have worked in an
area that contained very expansive soils.  The floor slabs need to move like a
floating mat to keep the movable portions of the structure (doors and windows)
operational.  If the slab experiences differential movement door and window
will bind.  Something the owners want to avoid.

Hope this helps.

Jay L. Crawford, P.E.