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Vapour membrane v Air tightness membrane.

  • 20-11-2011 1:35am
    #1
    [Deleted User]
    Posts: 0 ✭


    They are discussed here quite a bit.

    I assume a vapour membrane is a plastic of some sort, that water will not leak through. Surely you do not want that in your house ?

    What is the difference between the two ?

    Is the air tighness membrane suitable for airtighness in the wall as well as a vapour barrier under the tiles ?:o:o

    This is what Proclima suggest for roofs
    http://download.proclima.com/en/int/solitexSystem.pdf

    Others say this is suitable for wrapping around hollowcore for air tightness(due to its tear strength). But this is breathable(lets vapour pass through) so how is it air tight ?


Comments

  • #2
    No6
    Registered Users, Registered Users 2 Posts: 2,489 ✭✭✭No6


    A sheet of polythene is the most basic vapor barrier you can get, it stops vapor passing through. A vapor control membrane allows vapor to diffuse outwards from warm to cold but not inwards. An airtight membrane allows vapor to diffuse outwards as well but is sealed with tapes etc to keep air in. Each membrane type is designed for a specific purpose so while it may work to an extent somewhere else it will not be as effective as a membrane designed for that specific purpose.


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