Frozen soil against the wall around Ann Arbor
一年 13 天低於 -12°C，加上黏土 28%——土結凍時膨脹，橫向推擠地下室牆.
一年 13 天低於 -12°C，加上黏土 28%——土結凍時膨脹，橫向推擠地下室牆
Ann Arbor records about 13 days a year below minus 12 Celsius, and frozen soil expands sideways against a basement wall rather than downward.
Why this loads the wall
A basement wall is holding back soil, and soil that cannot drain holds water. Saturated ground behaves like a liquid against the wall, and the pressure rises with the height of the water table, not with how hard it rained.
At roughly 28 percent clay, the ground around Ann Arbor drains slowly, so the water pressure against the wall lasts well past the end of the storm.
What to do before spending anything
- Extend every downspout at least six feet from the wall - this alone fixes a meaningful share of wet basements
- Check the grade falls away from the house for the first ten feet
- Photograph and date where the water appears, and note whether it follows rain
- Look at the height of the stain: at the floor joint, or higher up the wall
The soil sampled around Ann Arbor is classed as well drained, which is the single best predictor of whether water sits against a foundation wall after rain.
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