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Concrete floor drying time

  • 22-07-2017 7:16pm
    #1
    Glowing
    Registered Users, Registered Users 2 Posts: 2,851 ✭✭✭


    Hi,

    Just wondering how concrete drying time is usually absorbed into a build schedule .... our spec has a 150mm GGB sub-floor (a few layers of insulation and edging) and a 75mm of sand/cement screed on top.

    I'm concerned that the slab won't be dry enough to lay engineered wood floor by the time we move in ... or is it generally long enough after floor has been poured that it's ready to go by the time floors need to go down? We'll be installing UFH.

    Cheers


Comments

  • #2
    delfagio
    Registered Users, Registered Users 2 Posts: 376 ✭✭delfagio


    Everyone does it differently to suit themselves, there's no particular right or wrong way. However typically to programme your screeded floors early in the build after the house is weather tight.

    Usually you would complete the internal slabbing and plastering and then the insulation can be installed and plumbers or UFH contractor can do the UFH pipes. Screed can then be installed.

    While the Screed is poured external works can take place to keep things moving and 2nd fixes can be carried out inside the house. The heating to the UFH can be then turned on at low temperatures and gradually increase temperatures and ramp down again to help dry out the screed.

    Generally it would probably take approximately 8weeks for the screed to dry enough to lay any flooring.

    Factor this time into your programme to try work other items around waiting for floors to dry out. Such as painting, 2nd fix carpentry, external works, etc.


  • #3
    Glowing
    Registered Users, Registered Users 2 Posts: 2,851 ✭✭✭Glowing


    Great defalgio, thanks.

    Are floors *always* left until the moisture hits the required % before floors are laid, or is that down to the particular contractor?


  • #4
    delfagio
    Registered Users, Registered Users 2 Posts: 376 ✭✭delfagio


    Glowing wrote:
    Are floors *always* left until the moisture hits the required % before floors are laid, or is that down to the particular contractor?

    Usually I think the moisture needs to be lower than 3%, don't quote me on this now, can't fully remember from when we done ours but yes if a contractor does the floor screed for you then it should be part of their remit to carry out a moisture test on the floor at various locations after the drying period is complete to ensure the floors are dry enough to lay flooring


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