Your home's ability to stay upright depends just as much on the support provided by the soil around it as its own material. Excess moisture, especially if you have an abundance of clay soil, can wreak havoc upon your foundation.
A clay-heavy soil will expand and contract with changing moisture contents. Heavy rainfall causes the soil to expand, placing horizontal pressure on your foundation. This may be a problem, as most foundations are built to withstand vertical pressures.
During times of drought, the soil around your home contracts, giving your foundation space to shift and re-settle. Repeated expansion and contraction slowly weakens your foundations, potentially causing a collapse.
Reinforcing your foundation against these horizontal forces can be cost-prohibitive. The best solution is to manage where your rainwater collects to ensure it doesn't threaten your foundation, and to hydrate your soil in times of drought.
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