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Airtight membrane really needed in ceiling?

  • 20-07-2019 10:19am
    #1
    Saddleview
    Registered Users Posts: 19 ✭


    Hello,
    Just wondering if an airtight membrane is really needed in a bungalow with MHRV. Would the sand/cement plaster finish not be a good enough seal on walls and ceiling provided i tape around the windows. I'd also plan to tape around light cable entry points and put airtight hoods sealed over any downlighters. Anyone out there do this? Would it be effective enough? Thanks.


Comments

  • #2
    bfclancy
    Registered Users, Registered Users 2 Posts: 181 ✭✭bfclancy


    Saddleview wrote: »
    Hello,
    Just wondering if an airtight membrane is really needed in a bungalow with MHRV. Would the sand/cement plaster finish not be a good enough seal on walls and ceiling provided i tape around the windows. I'd also plan to tape around light cable entry points and put airtight hoods sealed over any downlighters. Anyone out there do this? Would it be effective enough? Thanks.

    You don't use sand and cement on ceiling it's plasterboard and skim. Yes membrane is required


  • #3
    BryanF
    Moderators, Home & Garden Moderators Posts: 10,141 Mod ✭✭✭✭BryanF


    Is this an existing house or new build?


  • #4
    Saddleview
    Registered Users Posts: 19 ✭Saddleview


    bfclancy wrote: »
    You don't use sand and cement on ceiling it's plasterboard and skim. Yes membrane is required

    So the skim wouldn't be enough of a seal even after it's painted? Thanks


  • #5
    Saddleview
    Registered Users Posts: 19 ✭Saddleview


    BryanF wrote: »
    Is this an existing house or new build?

    New


  • #6
    Gumbo
    Moderators, Society & Culture Moderators Posts: 39,781 Mod ✭✭✭✭Gumbo


    Saddleview wrote: »
    So the skim wouldn't be enough of a seal even after it's painted? Thanks

    No, not a chance.
    The skim is a finish. It will expand, contract, crack and split over its life cycle.

    The AT membrane is a functional part of the building fabric.


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  • #7
    Wartburg
    Registered Users, Registered Users 2 Posts: 134 ✭✭Wartburg


    Membrane is highly recommended because it is your vapour control layer as well.
    It prevents the migration of warm and humid air into your building structure, where you create condensation if the temperature falls below the dew point. I know that some people here would probably debate that vapour control will be delivered by the mHRV. I´d say a permanent vapour control layer has to be prefered against a strategy which can fail (wrong balanced, defect, power outage).


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