It isn’t only areas with clay in the soil. The first time we had to have our foundation repaired (and thankfully the only time) was in an area with very sandy soil and no clay at all. The foundation repair company installed the watering system around our foundation there. Here, the soil isn’t full of clay at all. We have very good sandy, rich dirty here and finding any house at all in this area without foundation issues was difficult. My understanding, and I’m no expert, is that any time the soil dries out and shrinks and then gets wet and expands, there’s a chance for foundation damage. Keeping the soil uniformly moist is the best way to avoid damage, no matter which soil type you have.
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