Frost heave around Lee's Summit
一年 70 天日夜跨越冰點; 土壤排水等級「Somewhat poorly drained」.
一年 70 天日夜跨越冰點
土壤排水等級「Somewhat poorly drained」
Soil sampled near Lee's Summit runs 22 percent clay with a linear extensibility of 2.8, which is the standard measure of how much that ground changes volume with moisture.
Why this matters for a footing
A footing is designed for a soil that stays roughly the same size. When the ground beneath one part of the house changes volume and the ground beneath another part does not, the house is asked to bridge the difference, and concrete is not good at that.
Lee's Summit records about 70 days a year where the temperature crosses freezing between night and day, and each of those cycles works existing cracks a little wider.
What you can do without spending much
- Get roof water away from the wall - extensions on downspouts are the cheapest intervention there is
- Keep the soil moisture around the perimeter even rather than swinging wet to bone dry
- Watch tree roots close to the footing, which draw moisture out of one side only
- Mark and date crack ends, then photograph them each season
Lee's Summit averages 1092 mm of rain a year, and it is the swing between the wet and dry parts of that total, not the total itself, that moves a footing.
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