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Cavity wall insulation

  • 05-06-2020 12:42pm
    #1
    Keep Sluicing
    Registered Users Posts: 476 ✭✭


    I know this has been discussed several time on here before, but i can't find a thread with what I'm looking for.
    But is there a way of getting a U value of 0.16 or better by using just insulation (pumped of sheet/boards) in a 150mm wide cavity. Standard 100mm inner and outer leaf.
    Do i have to look at external insulation or another system to get this u-value?


Comments

  • #2
    Gumbo
    Moderators, Society & Culture Moderators Posts: 39,783 Mod ✭✭✭✭Gumbo


    Keep Sluicing wrote: »
    I know this has been discussed several time on here before, but i can't find a thread with what I'm looking for.
    But is there a way of getting a U value of 0.16 or better by using just insulation (pumped of sheet/boards) in a 150mm wide cavity. Standard 100mm inner and outer leaf.
    Do i have to look at external insulation or another system to get this u-value?

    0.20 using Kore Diamond full full.
    To achieve 0.16 you need a 200mm cavity.

    Xtratherm full fill cavity claims to achieve it.
    https://cavitytherm.ie/why-choose-cavitytherm/ultimate-thermal-performance/


  • #3
    Calahonda52
    Registered Users, Registered Users 2 Posts: 12,576 ✭✭✭✭Calahonda52


    Keep Sluicing wrote: »
    I know this has been discussed several time on here before, but i can't find a thread with what I'm looking for.
    But is there a way of getting a U value of 0.16 or better by using just insulation (pumped of sheet/boards) in a 150mm wide cavity. Standard 100mm inner and outer leaf.
    Do i have to look at external insulation or another system to get this u-value?

    Is this a new build and if so at what stage?

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



  • #4
    sheff the ref
    Registered Users Posts: 618 ✭✭✭sheff the ref


    Insulation is a combined effort,

    walls
    installed windows
    reveals around windows
    roof

    The factor these days is the whole area of ventilation. For all the minute U-values, the ventilation surely cancels out a lot of the insulation work, but is necessary to avoid dampness.


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