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floor screed

  • 22-02-2012 10:27pm
    #1
    jdesbt
    Registered Users, Registered Users 2 Posts: 86 ✭✭


    hi all

    iv just laid my underfloor insulation and am wondering if i need to put plastic over it before the screed goes down,, its extratherm 8x4 sheets of insulation

    thanks j


Comments

  • #2
    fclauson
    Registered Users, Registered Users 2 Posts: 1,691 ✭✭✭fclauson


    I beleive that best practice is yes so that the screed does not dribble down between the insulation forming a cold bridge direct to the sub floor

    just one other thought - what thickness/Uvalue have you put down

    the MORE the better


  • #3
    muffler
    Registered Users, Registered Users 2 Posts: 46,713 ✭✭✭✭muffler


    fclauson wrote: »
    I beleive that best practice is yes so that the screed does not dribble down between the insulation forming a cold bridge direct to the sub floor
    Good point but I think jdesbt may have been referring to the possible chemical interaction of the cement content of the screed with the insulation


  • #4
    peterc14
    Registered Users, Registered Users 2 Posts: 155 ✭✭peterc14


    jdesbt wrote: »
    hi all

    iv just laid my underfloor insulation and am wondering if i need to put plastic over it before the screed goes down,, its extratherm 8x4 sheets of insulation

    thanks j

    Yes - definately a good idea to do that... lap it up the sides of the perimiter insulation also.


  • #5
    jdesbt
    Registered Users, Registered Users 2 Posts: 86 ✭✭jdesbt


    ive got 100mm downstairs ant 50mm upstairs,.

    it was more the chemical reaction i was wondering about,,

    will it matter. does it eat away the foil ,

    i dont have any perimiter insulation i thought that was just for ufh

    thanks guys


  • #6
    fclauson
    Registered Users, Registered Users 2 Posts: 1,691 ✭✭✭fclauson


    jdesbt wrote: »
    ive got 100mm downstairs ant 50mm upstairs,.

    it was more the chemical reaction i was wondering about,,

    will it matter. does it eat away the foil ,

    i dont have any perimiter insulation i thought that was just for ufh

    thanks guys

    Not sure about the interaction etc (but read the IAB or BBA certs for the products)

    On the 100mm - that would not comply with 2011 regs (if you are having UFH) - if you could get 150mm in then it would make a big difference.

    Also if you can have an upstand around ALL your walls (i.e. the screed is then in tray in each room) it will minimise heat going downwards


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  • #7
    BryanF
    Moderators, Home & Garden Moderators Posts: 10,146 Mod ✭✭✭✭BryanF


    jdesbt wrote: »

    i dont have any perimiter insulation i thought that was just for ufh
    :eek: go ask who ever is certifying that your build complys with building regulations! if your self-building then, you should have read and understood the following http://www.environ.ie/en/TGD/

    for your specific query regarding perimeter insulation see the Acceptable Construction Details. DONT rely on your builders as in general they will not be up to code. while your at it, ask whoever HAS DONE your provisonal BER what thermal bridge factor they have used.

    best of luck with your project


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