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Not by calculation, but by observing the depth or level at which moisture in the soil freezes. The term frost line as used in architecture is really a level or depth, that varies with location and it is important that foundations extend to a level well below this, so that frozen water in the soil does not cause the foundation to heave. The term frost line might also be used in weather reports, and would probably mean geographic areas or elevations in mountains, beyond which freezing conditions occur.

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14y ago
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Q: How do they calculate the frost line?
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