Q:

How deep should a concrete footer be?

A:

Quick Answer

The depth of footings is determined by the depth of the frost line. The top of the footing must be poured below the frost line to maintain stability.

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Full Answer

The depth of the frost line can vary by location. In northern states, the frost line may be as deep as 60 inches or more. Southern locations may have a frost line of less than 20 inches. The poured depth of the footing should be equal to the thickness of the wall that it supports. The width of the footing must be at least twice the width of the wall that it supports.

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Related Questions

  • Q:

    What is the frost line in Indiana?

    A:

    The frost line in Indiana is the depth that groundwater in the soil freezes during the winter. The frost line depth in Indiana ranges from 30 to 60 inches, with 30 inches being the frost line depth in the southern part of the state and 60 inches in the north.

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  • Q:

    What is a frost line?

    A:

    The frost line is the maximum depth at which soil is frozen, or the lower limit of permafrost. The depth of the frost depends on the local climate, the heat transfer properties of the soil, and the adjacent materials and nearby heat sources.

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  • Q:

    What is the frost line in Iowa?

    A:

    The average depth of the frost line in Iowa is 58 inches. In the northern part of the state, the frost line can be up to 70 inches deep, while in the southern part the line may be less than 40 inches deep.

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  • Q:

    How do you figure how much concrete to use?

    A:

    Figure out the amount of concrete to use by calculating the volume of the desired concrete slab and the footings supporting the slab, then converting this area to cubic yards. The method for calculating the volume of concrete needed for slabs is also used for any concrete structure.

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