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U-Value for UFH

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  • 16-01-2021 9:17pm
    #1
    reidygs
    Registered Users Posts: 7 ✭


    Hi,

    I'm renovating my house at the moment and I had planned to go with radiators and a combi boiler. I poured a 125mm concrete slab over 100mm PIR insulation intending to put down a batten timber floor. I'm sorry that I never considered UFH at the start, but I'm looking at a work around to get to a U-value of 0.15.

    I can afford to lose height as I have very high ceilings and 160mm is the max I can go and this will need to include 50mm liquid screed and 22mm engineered floor. Perimeter to area is 0.5.
    I was going to put down 80mm Kingspan K3 which would get me to a U-value of 0.18.
    I was also considering multifoil insulation above and below (6mm + 6mm) the PIR to reduce the U-value. I'm a little sceptical of multifoil, but apparently it works better when used with PIR.
    I was also wondering (and it might be a stretch) would the 100mm PIR under the existing concrete slab have any effect on the U-value required for UFH?

    Any feedback or advice would be greatly appreciated.


Comments

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    #2
    Calahonda52
    Registered Users Posts: 12,193 ✭✭✭✭Calahonda52


    What height are your door heads?
    is there perimeter insulation around the 100?
    I would forget about the multi foil

    “I can’t pay my staff or mortgage with instagram likes”.



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    #3
    reidygs
    Registered Users Posts: 7 ✭reidygs


    Hi Calahonda,
    The doorheads are 2450, but also includes a fanlight.
    There is 100mm insulation around the perimeter.
    Is there no benefit to multifoil with PIR insulation?
    Thanks


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    #4
    MicktheMan
    Registered Users Posts: 2,823 ✭✭✭MicktheMan


    Sorry, not Uvalue related but have you lived in a place with UF before?
    I know that I would not like it. I (well, my feet) like a cooler slab when in a warm / comfortable space!


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    #5
    reidygs
    Registered Users Posts: 7 ✭reidygs


    Hi Mick, I have yes and I loved it. I was in Japan for a few months and the place we stayed had it. The renovations have being going on for years and I really wish I had considered it before my trip...


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