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How Deep Is The Frost Line In Tennessee?

Additionally, water and sewer pipes need to be placed below the frost lines as well. Here are the 10 states with the deepest frost lines: Alaska (100 inches) Minnesota (80 inches)

Frost Lines by State 2021.

State Frost Lines (Inches)
Tennessee 12
Texas 10
North Carolina 10
Arizona 10


  • Our frost line in this part of Tennessee is 6″. I’ve heard from a few local builders that the frost line is actually only 3″ – it’s doubled to be safe and prepare for an extreme scenario. However, with piers, all the weight of the building is on these specific points, instead of distributed evenly throughout a perimeter foundation.

How deep are water lines in Tennessee?

Exterior water supply system piping shall be installed not less than 6 inches (152 mm) below the frost line and not less than 12 inches (305 mm) below grade.

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How deep do footings need to be for frost?

Depth of Footings Footings should extend to a minimum depth of 12 inches below previously undisturbed soil. Footings also must extend at least 12 inches below the frost line (the depth to which the ground freezes in winter) or must be frost-protected.

How far down is the frost line?

The line varies by latitude, it is deeper closer to the poles. Per Federal Highway Administration Publication Number FHWA-HRT-08-057, the maximum frost depth observed in the contiguous United States ranges from 0 to 8 feet (2.4 m). Below that depth, the temperature varies, but is always above 32 °F (0 °C).

What happens if you don’t dig below the frost line?

A footing destined to fail: frost line depth chart If the footing does not extend below the frost line, the footing will heave as the ground freezes and thaws.

How deep does a water line have to be in the ground?

Underground piping shall be buried not less than 18 inches below the surface of the ground unless otherwise protected.

How deep should water lines be buried?

The classic rule-of-thumb procedure for avoiding cold-weather damage to water pipe is “bury it deep.” If water lines are located below the lowest level of frost penetration— five to six feet or more in many cold region locales—they should be safe from freezing.

Why do footings go below frost line?

When you excavate your footings you will need to dig below the frost line. This is the depth at which the moisture present in the soil is expected to freeze. Once your footings are buried below the frost line the ground will act as a barrier to insulate the soil below the footing from freezing in the winter.

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Why are footings placed below the frost line?

Most building codes in cold-climates require foundation footings be placed below the frost line, which can be about 4-feet deep in the northern United States. The goal is to protect foundations from frost heaving.

How far below the ground should the top of the footing be?

The depth below ground level to the base of the footing should be not less than 300mm or to rock, whichever occurs first, which allows for a minimum of 100mm of ground cover to the pad.

What is the ground temperature below the frost line?

When the temperature of the ground drops below 0° C (32° F), it freezes; however, the ground temperature can be different from the temperature of the air above it.

Does a French drain need to be below the frost line?

Unless specifically regulated by local building authorities, french drains may be placed either above or below the frost line. However, the placement of a french drain relative to the frost line greatly affects the drain’s performance.

How is frost depth measured?

Frost depth should be measured on the same day at the same time each week, ideally within one hour of solar noon. To measure, remove the cap on the outer pipe and raise the flexible inner tube.

Is 2 feet deep enough for fence posts?

2 feet is the minimum depth that you should dig your fence post holes for. To dig the holes one-third to one-half of the post’s aboveground height, is a general formula. The deeper you dig the holes, the more stability your fence has.

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How deep should post holes be for a deck?

Dig the holes six inches deeper than the required frost line depth for your area, and slightly wider than the concrete footer tubes you’ll be using. A power auger can make this step easier and faster.

How far apart should deck posts be?

When building your deck frame, the maximum spacing of Deck Posts for should be no further than 8 feet apart.

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