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Exterior Concrete Stair Footing Below Frost Line?

Discussion in 'Residential Structural Codes' started by fj80, Aug 9, 2017.

  1. fj80

    fj80 Bronze Member

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    2012 IRC. When you have a concrete pad and steps outside an exterior door of a house, at the bottom step do you need to extend the concrete down below the frost line? I'm guessing that
    you do, so you don't get upheaval from soil expansion during freezing, but am not totally sure.
     
  2. JBI

    JBI Sawhorse

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    Short answer is yes. See R403.1.4.1 Frost protection.
     
  3. JBI

    JBI Sawhorse

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    upload_2017-8-9_11-58-41.png
     
    north star likes this.
  4. fatboy

    fatboy Administrator

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    We don't require it here.
     
  5. steveray

    steveray Sawhorse

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    Nor here..Call it #3 of JBI's code section....just don't "attach" it to the house....
     
  6. fj80

    fj80 Bronze Member

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    It has to be attached to the house for our situation. It's a landing outside the mudroom exterior door, then a couple steps down to grade.
     
  7. Francis Vineyard

    Francis Vineyard Sawhorse

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    Now that the code permits exterior landings to be free standing (Ref. R311.5.1) we permit the #3 exception.
     
    #7 Francis Vineyard, Aug 9, 2017
    Last edited: Aug 9, 2017

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