Frost box? - Foundation engineering | Eng-Tips the depth of frost penetration depends on a lot of things One factor is the presence of water in the soil As that material is at 32 degrees, it gives off heat of fusion That heat release slows down the migration of that freezing front As an extreme of this, take the depth of frost at a lake as compared to soil on land
Sources for Frost Depth Values - Structural engineering general . . . to frost shall have the thickness of such a layer included in meeting the design frost depth defined in Section 3 2 Undisturbed granular soils or fill material with less than 6% of mass passing a #200 (0 074 mm) mesh sieve in accordance with ASTM D422 and other approved non–frost-susceptible materials shall be considered non–frost-susceptible
quot;Top quot; or quot;Bottom quot; of Footing? 5 - Eng-Tips I agree that "bottom of footing" is the standard in regards to frost depth A note on JAE's comment-I don't agree the 42" footing depth versus an "average" frost depth of 26" is the correct picture of the safety factor The frost depth value to consider is the design depth of frost, which is typically the 30-year maximum value
Frost Penetration and Movement 3 - Eng-Tips If the soil is non-frost susceptible (meaning that there is no significant change in volume (i e , water freezing), you can put footings down fairly shallow (I did this in northern Ontario - frost depth was 9 ft (3 m) but the soil supporting structure was clean sand (non-frost susceptible) the water table was below 12 ft (4m)meaning that even
Frost Heave Calculation - Foundation engineering | Eng-Tips I view frost as an "infinite" force If conditions are right for it to form, it can lift just about anything I don't know of any calculation that will give frost pressure I've seen published values of 10 tsf, but I believe they are based on back-calculating the pressure required to lift a building where frost heave was observed
Exterior Large Equipment Pad with deep frost depths 7 - Eng-Tips So, the frost depth say 6 ft specified at local code may occur at outside of insulated SOG, but the frost depth below SOG will be around just one ft I want to add that, if the soil is collapsible ( silty clay with some organics) the ground may settle every year at the end of frost season My suggestion to BSPE90 will be;
Frost protection of fill - Earthwork grading engineering - Eng-Tips For example snow covered ground will have musch less frost penetration than an area kept clear of snow The depth the frost will penetrate below the insulating layer depends on insulating value (thermal conductivity and thickness), initial ground temperature, and of course the air temperature over the freezing period
Slab on grade amp; frost heave 1 - Eng-Tips Constructing a "frost wall" does nothing for the area under the slab if that zone goes below 32 degrees F Concrete is a good conductor of heat out of the area under the slab However, if the contents of the tank are kept above freezing, then you may have no problem, since it keeps the ground below the slab warm
Floating slab on grade detail at exterior door 1 - Eng-Tips I see a similar condition all the time in my jurisdiction but with 4' frost walls We're always dealing with expansive clays Most of he geotechnical reports here will specify floating slabs but with a downturn dowels at the exterior doors It's a bit of a contradiction which, presumably, is why you've posed the question
How is frost depth determined calculated? 1 - Eng-Tips Frost depth is an aspect of the majority of foundation design that I do, but thinking about it, I realize I'm not sure how the actual frost depth is determined I see STP1358, "Remote Field Methods to Measure Frost Depth" (from the ASTM website) outlines several ways that frost depth can be calculated