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  • Sources for Frost Depth Values | Eng-Tips
    Hello all, this is my first post here so please bear with me Where do you go to find accurate frost depth line values? At my job, we often have to design footers foundations rapidly so as to get them to a costumer for the purposes of an estimate Because everything needs done ASAP, contacting
  • Frost Penetration and Movement | Eng-Tips
    Frost penetration and frost depth effects are really two different animals As OldestGuy indicated, even in very cold climates, they recognize that footings do not have to go full depth of frost penetration if they are in non-frost susceptible soil
  • When to Go Down to the Frost Depth | Eng-Tips
    I always hear that the footings have to be placed below the frost depth but does that apply to any footing? For a job where the local code indicates frost depth of 42”, all exterior bldg footings are placed at that depth but when it comes to the exterior stairs, they only go down 18” only!! The
  • Frost Protection for Interior Footings | Eng-Tips
    If the building is heated there is no need to frost protect interior footings On the other hand, if the structure is an unheated warehouse, then they should be protected just as exterior footings are Thanks for the response
  • Frost line depth | Eng-Tips
    Hi guys! How many of you take in account the frost line depth while defining the foundation depth? Im asking this couse for my country wich is relativly warm, has mild winters rearly under 0"C for no longer then 7 days, minimum foundation depth is 80cm below finished ground level Converstaing
  • Is Frost Depth Always Required? | Eng-Tips
    No, frost depth is not always required if what you are supporting can withstand the movement However, for most pipe racks we have designed we have gone to frost depth There have been a few short runs where the client did not want to go that deep We informed the client of the potential heave and the possible issues (similar to you describing)
  • Crushed stone size limitation for non-expansive frostfree fill
    If you are referring to non-frost susceptible (NFS) material, the definition is a soil that contains no more than 3% by weight finer than 0 02 mm A #200 sieve is generally used (0 074 mm), for which the requirement is no more than 5% passing Whether crushed or not isn't a factor No upper size limit, but 3" is a typical upper limit for practical compaction purposes For non-expansive, I
  • Frost Protection for Retaining Wall Foundation. | Eng-Tips
    There is a manual for designing airfield pavements on frost-susceptible soils using rigid insulation, but I can't lay my hands on it Perhaps FAA or USAF or CRREL In the Midwest where maximum frost penetration was 4 to 5 feet, I used 2 inches of rigid Styrofoam insulation under critical sidewalks and pavements and had little to no movement I also used it behind the walls where the backfill
  • What causes frost heave? | Eng-Tips
    Frost heave requires 3 things: 1 Freezing temperatures, causing frost level to penetrate the ground 2 Frost-susceptible soil (generally means silty or clayey) 3 A source of subgrade moisture The heaving is due to more than just freezing in the pore space, there is water migration and ice lenses are formed
  • Frost depth consideration in existing rock layer | Eng-Tips
    If I propose to install a strip footing of reinf concrete for live and dead loads such that design allowable soil bearing capacity is 8000 psf do i have to be concerned about the fact that the existing rock layer is above the frost line?





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