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Raft foundation + cold weather

  • 08-03-2011 11:25am
    #1
    NickTellis
    Registered Users, Registered Users 2 Posts: 268 ✭✭


    Getting a 6 x 9 meter raft for an extension poured (hopefully) early next week. Forecast isn't looking good with a cold snap predicted for the next couple of weeks (including a white Paddy's Day) :-(
    Could the cold weather have adverse effects on the foundation and what measures can be done to prevent them?


Comments

  • #2
    CJhaughey
    Registered Users, Registered Users 2 Posts: 14,907 ✭✭✭✭CJhaughey


    Don't do it.
    Seriously wait till the threat of freezing weather has gone. Frost can seriously damage a slab.


  • #3
    FesterBeatty
    Banned (with Prison Access) Posts: 406 ✭✭FesterBeatty


    Absolute minimum ambient shaded temperature to be 3 degrees and rising. Even at that you will want frost blankets covering the concrete for minimum 24 hours.

    All depends on your concrete strengths. You need a concrete strength of 5N/mm sq for concrete to be able to withstand the forces associated with expansion of freezing moisture - and you're not going to achieve 5N/mm sq within the first 24 hours.

    Simple solution - don't pour now. The last thing you want is an issue with a raft foundation - they can be a disaster at the best of times due to rotation/differential settlement. No doubt your structural engineer can provide best project specific advice with regard to cold weather pouring.


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