Hydrostatic pressure around St. Clair Shores
黏土 50%——排水慢，雨後牆外的水壓維持得久; 屋齡中位 1957 年——那個年代的地下室牆多半沒有外部防水層，只靠混凝土本身.
黏土 50%——排水慢，雨後牆外的水壓維持得久
屋齡中位 1957 年——那個年代的地下室牆多半沒有外部防水層，只靠混凝土本身
The soil sampled around St. Clair Shores is classed as very poorly drained, which is the single best predictor of whether water sits against a foundation wall after rain.
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.
St. Clair Shores records about 6 days a year below minus 12 Celsius, and frozen soil expands sideways against a basement wall rather than downward.
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
At roughly 50 percent clay, the ground around St. Clair Shores drains slowly, so the water pressure against the wall lasts well past the end of the storm.
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