Frost line

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Izabela Toma

August 22, 2024 21:56

Hi,

I understand the basic concept, but I am seeking clarification on whether a foundation should be placed below or above the frost line. I've encountered conflicting information from different sources, which has led to some confusion.

Thank you.

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  Apple Prasopphakdi August 23, 2024 13:28 (Edited August 23, 2024 13:29)

  From Chen's PA mock exam, it says the bottom of the foundation should be place at the frost line as a MINIMUM requirement (I can take a look at this when I get home to confirm). But generally, a foundation should be placed below the frost line. 

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  Valerie Galchenko August 24, 2024 00:43

  Hi, the exterior foundation needs to extend at least 12 inches BELOW the frost line to prevent the frost heave. 

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  Izabela Toma August 24, 2024 19:09

  Thank you for clarifications on this.

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