Freestanding deck footing depth
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Frost depth frost lines by state.
Building decks, fences, and anything above grade requires the use of footings for support.
Frost line depth by zip code
These footings must be placed at a certain depth especially if you are in an area where the ground freezes which can cause your footings and posts to heave.
This depth is determined by the frost line in your area and the map below will show you how deep you need to dig to safely place your footings.
What is a Frost Line
The frost line is the depth at which the ground freezes.
It’s important to know the frost line depth for construction purposes. Water pipes should always be set below a frost line to prevent them from freezing in the winter.
It’s also important that the footings for a building or a deck are placed well below the frost line so the posts don’t shift as the ground freezes and thaws.
Check your local building codes to determine the proper depth past a frost line a footing should sit.
What is Frost Heave?
Frost heave is when the ground freezes and then thaws. This process causes the ground and anything in it to move upwards.
You can see how this
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