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Vapour Control Layer

  • 05-02-2009 5:49pm
    #1
    Independent
    Closed Accounts Posts: 55 ✭✭


    I was wondering do i need a vapour control layer on my external block walls. i have a double leaf block wall with 65mm PIR insulation in 100mm cavity I want to use a Insulated board 30mm insulation 12.5 plasterboard, i have a couple of questions,
    1. Can i fix directly onto block wall with mushroom fixings, or is it better to dot and dab.
    2. Should i use a product with a Vapour control layer built in or if i use a product that does'nt have it built in, how do i install it.
    Thanks.


Comments

  • #2
    RKQ
    Registered Users, Registered Users 2 Posts: 2,292 ✭✭✭RKQ


    Independent wrote: »
    1. Can i fix directly onto block wall with mushroom fixings, or is it better to dot and dab.

    Install as per manufacturers recommendation. IMO 30mm with mushroom fixings is fine, others may worry about condensation but IMO 30mm won't make that much of a difference in a habital home.
    Independent wrote: »
    2. Should i use a product with a Vapour control layer built in or if i use a product that does'nt have it built in, how do i install it.
    Thanks.

    IMO its better to fit a proper certified vapour barrier. The junction of the wall with the floor and the wall with the roof / ceiling is critical. These areas require overlapping of materials and proper sealing. Have a look at Siga, ProClima & Moy web sites.


  • #3
    Independent
    Closed Accounts Posts: 55 ✭✭Independent


    RKQ wrote: »
    Install as per manufacturers recommendation. IMO 30mm with mushroom fixings is fine, others may worry about condensation but IMO 30mm won't make that much of a difference in a habital home.

    Thanks RKO, when you say 30mm wont make much difference in a home, what would and how?


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