Engineered fill around Champaign
表層被歸類為 Orthents（人為填方／擾動地），黏土 25%.
表層被歸類為 Orthents（人為填方／擾動地），黏土 25%
Soil sampled near Champaign runs 25 percent clay with a linear extensibility of 1.5, 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.
The seasonal swing is what does the damage, not the average.
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
Housing age tells you what the original footing detail is likely to be.
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