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Why it matters
Foundations and footings often need to extend below frost depth so freezing soil does not lift the house.
Where people get this wrong
Frost depth depends on climate and soil. Insulation can sometimes change details, but it must be designed correctly.
Real-world example
A small porch slab lifts every winter and settles every spring. That can happen when concrete is placed too shallow in a freeze climate.
Where this hits your build
This matters during site work and foundation. Mistakes here get buried and are expensive to fix later. Pay attention before concrete is poured.
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