The 2010 California Residential Code has a beautiful table (TABLE R301.2(1)) to list the frost lines; however, that is empty. The Santa Cruz County Municipal Code states "Frost line depth = 12 inches below undisturbed soil". Search for "frost line".
When excavating your deck footings, you'll need to dig below the frost line. Find out how deep the frost line is in your area with our frost depth map at Decks.com.
The frost line—also known as frost depth or freezing depth—is most commonly the depth to which the groundwater in soil is expected to freeze. The frost depth depends on the climatic conditions of an area, the heat transfer properties of the soil and adjacent materials, and on
The bottom of your footings should sit 6 inches below the frost line so the posts won’t shift as the ground freezes and thaws. You should also check your local building codes and call the city and speak to someone in the engineering department just to be certain of how deep do dig.
I did a Yahoo search and, even though I found quite a bit of "bury it below the frost line" type of advice, I still couldn't find any information on the frost line depth itself. Considering how important this is, I find it hard to believe that nobody has ever published anything on this subject.
The point missing, in my view, above is that the "frost line depth" is just a line that frost can penetrate - but says nothing about the effect of the frost. Case in point, in northern Ontario we had a site where the frost depth was about 3 m (10 ft). The soil, however, was clean medium to coarse sand to depth.
In this article, we will cover the Frost Line Depth in North America. Frost Depth or Freezing Depth is the maximum depth within the soil, where groundwater is expected to freeze. The frost depth depends on outside temperature, the amount of insulating snow cover, the heat transfer properties of the ground material near the area in question, and any possible Continue Reading
The frost line is simply the deepest point in the ground to which ground water will freeze. It’s also referred to as the frost depth.. When water changes from liquid to solid, it expands 9% in volume.. This resulted frost heave can be detrimental to footings and foundations.
The frost line therefore separates terrestrial planets from giant planets in the Solar System. However, giant planets have been found inside the frost line around several other stars (so-called hot Jupiters). They are thought to have formed outside the frost line, and later migrated inwards to their current positions.
To find a frost line depth, the temperature of the ground is taken until a depth is reached in which 32 degrees Fahrenheit registers on the thermometer. Climatic conditions, such as air temperature, snow cover, soil type and moisture, affect the depth of a frost line in a particular area. The frost line in one area can vary over many decades ...