Frozen soil against the wall around Bellevue
17 days a year below minus 12C with 29% clay, and soil expands as it freezes, pushing sideways against the basement wall.
17 days a year below minus 12C with 29% clay, and soil expands as it freezes, pushing sideways against the basement wall
Bellevue records about 17 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 29 percent clay, the ground around Bellevue 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 median home in Bellevue dates from 1982, which decides whether the wall was given any exterior waterproofing at all when it was poured.
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