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Suspended Timber Floor Insulation - Materials/Product Choices?

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    #32
    BryanF
    Moderators, Home & Garden Moderators Posts: 10,140 Mod ✭✭✭✭BryanF


    And the pipes are notched into the 4’’ timbers? ...


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    #33
    phobia2011
    Registered Users Posts: 1,291 ✭✭✭phobia2011


    Yeah, will need to notch once at each end of joist, 20mm ��


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    #34
    phobia2011
    Registered Users Posts: 1,291 ✭✭✭phobia2011


    Just need to be sure, if I used rigid insulation

    Do I still need breathable membrane below and airtight above?


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    #35
    chooseusername
    Registered Users Posts: 3,700 ✭✭✭chooseusername


    phobia2011 wrote: »
    Yeah, will need to notch once at each end of joist, 20mm ��
    You might be better off with the pipes on top of the joists,
    saves notching 4" joists

    https://www.ufh.co.uk/system/oneboard

    Will raise your floor about 1/2" though.


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    #36
    BryanF
    Moderators, Home & Garden Moderators Posts: 10,140 Mod ✭✭✭✭BryanF


    phobia2011 wrote: »
    Just need to be sure, if I used rigid insulation

    Do I still need breathable membrane below and airtight above?

    Yes that would be best.


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    #37
    jay0109
    Registered Users Posts: 2,670 ✭✭✭jay0109


    Am about to get insulation put under my 1960's suspended floor and have been reading this thread with interest. There's a 3 ft cavity underneath the floor so it's just about possible to get in and work from below without having to take up all the floorboards. Initially we were going to spray foam the underside but the foam cannot be got in Ireland and there's problems shipping it in from the UK.

    Now looking at Kingspan 100mm insulation boards cut to fit between the joists, foam into any gaps and then the aluclad tape over that as recommended by Calahonda. Breathable membrane such as Solitex Plus under the Kingspan boards, fastened to the underside of the joists.

    As I'm not lifting the floorboards I won't have the airtight, vapor control barrier above the Kingspan boards.

    Any thoughts or advice on this? Not ideal I know but best that can be done in the circumstances.

    One thing that I've been wondering about...what happens if water/drinks are spilled on the wooden floor and get on to the Kingspan boards? Evaporate over time?



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    #38
    BryanF
    Moderators, Home & Garden Moderators Posts: 10,140 Mod ✭✭✭✭BryanF


    air-tightness/vapour barrier taped & sealed, warm side of the insulation



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