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Hollowcore filled ends v Airtight Membrane

  • 02-07-2017 9:44pm
    #1
    voyager1
    Registered Users, Registered Users 2 Posts: 17 ✭


    Starting a new build now shortly, just doing my due diligence so I know what everyone else is talking about.
    I am going for 150mm cavity with Cavitytherm full fill insulation.  My question is, if the manufacturer fills the ends and the cavity is fully filled is there a requirement for a airtightness membrane?


Comments

  • #2
    BryanF
    Moderators, Home & Garden Moderators Posts: 10,146 Mod ✭✭✭✭BryanF


    Yes. Wrap end of slabs.


  • #3
    B-D-P--
    Registered Users, Registered Users 2 Posts: 1,167 ✭✭✭B-D-P--


    As mentioned, It still stops any leaks from brick to hollowcore seeping out.

    It will cost you no more than €150 for membrane, you'd be silly not to.


  • #4
    sydthebeat
    Subscribers Posts: 42,172 ✭✭✭✭sydthebeat


    voyager1 wrote: »
    Starting a new build now shortly, just doing my due diligence so I know what everyone else is talking about.
    I am going for 150mm cavity with Cavitytherm full fill insulation.  My question is, if the manufacturer fills the ends and the cavity is fully filled is there a requirement for a airtightness membrane?

    The majority of the air leakage in this detail is between and around the slabs.


  • #5
    Metric Tensor
    Registered Users, Registered Users 2 Posts: 3,725 ✭✭✭Metric Tensor


    Do both. Wrapping is a much better job for the purpose you are describing but the additional costs of getting solid ends is very small and worth it as an additional benefit (in my opinion).

    N.B. The cores often fill with water so drain holes will be necessary before you put in ceilings, etc. underneath. The manufacturer should do this but might not. They will also advice you on where the holes should be. Bear in mind that the slabs camber upwards towards the middle.


  • #6
    voyager1
    Registered Users, Registered Users 2 Posts: 17 ✭voyager1


    Thanks for the replies appreciate it. I'll probably go with both.  I had priced Aerstad that was mentioned on another thread but supply only was nearly 600 sterling, looked a decent setup but a bit pricey.


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  • #7
    mfceiling
    Registered Users, Registered Users 2 Posts: 12,906 ✭✭✭✭mfceiling


    Metric Tensor wrote: »

    N.B. The cores often fill with water so drain holes will be necessary before you put in ceilings, etc. underneath. The manufacturer should do this but might not. They will also advice you on where the holes should be. Bear in mind that the slabs camber upwards towards the middle.

    We were putting up replacement ceilings last Friday in a building that is built about 10 years. The amount of water that came out of the hollowcore was ridiculous....foreman thought we'd drilled through a pipe!!


  • #8
    Metric Tensor
    Registered Users, Registered Users 2 Posts: 3,725 ✭✭✭Metric Tensor


    mfceiling wrote: »
    We were putting up replacement ceilings last Friday in a building that is built about 10 years. The amount of water that came out of the hollowcore was ridiculous....foreman thought we'd drilled through a pipe!!

    It's the type of lesson that often gets learned the hard way first time!!! At least in your case the ceiling was being replaced! I was lucky to learn from someone else's experience.


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