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Underfloor heating and drying out slab

  • 23-06-2011 9:29am
    #1
    Dugsy
    Registered Users, Registered Users 2 Posts: 24 ✭


    Just turned on my underfloor heating and will be gradually increasing the temperature to dry the slab out. What is the highest temperature which I should bring the slab up to during this process?


Comments

  • #2
    creedp
    Registered Users, Registered Users 2 Posts: 5,965 ✭✭✭creedp


    Dugsy wrote: »
    Just turned on my underfloor heating and will be gradually increasing the temperature to dry the slab out. What is the highest temperature which I should bring the slab up to during this process?

    I'd be interested in this as well as its been 3 weeks since I poured the screeds and now plan to turn on the the UFH to assist with drying out process upstairs at least. I had hoped to be able to allow them the dry out naturally but would need a least 3 months for this. Given that there was a 6 week delay in getting them poured and the fact that I have to move into house in Sept I need to accelerate the process if at all possible. I was hoping to start with an UFH temp of 20c and increase to 35c over a 2 week period. Would this be too severe?

    For downstairs I have a polished concrete finish and won't turn on UFH for at least 6 weeks and then gradually bring the temp up to 35c over a period of 4 weeks as I am worried about hairline cracks developing in screed. Not as problematic here as the floors will not be covered so they can continue to dry out over time.

    Bty I asked this before but I'll do so again, how can I measure the moisture content of the screeds so that I can plan when to start the joinery/tile work? I don't necessarily want to purchase an expensive meter which I will never again use and I'm assuming the inexpensive ones are of little value.

    Thanks


  • #3
    peterc14
    Registered Users, Registered Users 2 Posts: 155 ✭✭peterc14


    I have 75mm sand/cement screed with UFH and this is the program I am following..

    . Screed Poured
    . Leaving to dry naturally for 6 weeks
    . UFH turned on at 25 deg for 3 days
    . Then up by 5 deg each day until max
    . Max Temp for 4 days
    . Heating off and floor allowed to cool (4/5 days)
    . Start Tiling
    . No heat back on until 4 weeks after tiling completed

    From reading different opinions this is the way I decided to go about things. I am sure people will have differing opinions.


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