frost line

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frost line

The depth of frost penetration into the soil.It varies from area to area,depending on the soil quality in a particular location, but can average 3 to 4 feet below the surface. Building foundations should penetrate below the frost line in order to avoid the shifting caused by frost heaving. Many local building codes allow an exception with the use of a frost-protected shallow foundation, which uses insulation and drainage techniques to raise the frost line to just below the surface.

References in periodicals archive ?
HE'S more used to filming in the freezing depths of Antarctica or the sweltering jungles of the Amazon.
She appeared doomed - until Tommy dived into the freezing depths to save her.
Crystals of methane hydrates in the freezing depths clogged an opening on the box, preventing it from funneling the spouting oil up to a waiting ship.
Martin Platt, Kevin Webster and Tommy Nelson give hot pursuit until the car plunges into the freezing depths.