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Re: Foundation on Expansive Clay

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"My thinking is to turn down the outside edge of the footing an additional 6
inches.  If this clay is expansive, it shouldn't be given to capillary
action, and will provide a seal, preventing the soil beneath the foundation
from seeing the varying moisture content."

Is the expansive clay layer only 6" thick?  If this "turn-down" method is
effective in protecting the soil within the 6" zone, what about the soil
beneath IT?

My first inclination is to overexcavate and backfill.
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John P. Riley, PE, SE
Riley Engineering
20 Oakwood Drive, Blue Grass, Iowa 52726
Tel & Fax:  319-381-3949
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