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Waterproofing / Vapour barrier / airtightness

  • 11-12-2013 11:22am
    #1
    greenfit
    Registered Users Posts: 13 ✭


    Hi all

    I am installing a new shower / wet room in a timber frame house. Due to some damp (from a leak) I have stripped back to the external timber structure and I am now about to build up the insulation, plasterboard, tiling, etc. I hope to use a liquid application tanking system (ardex or similar) which is painted on to the plasterboard prior to tiling. My query is: does this waterproof layer act also as a vapour barrier that prevents moisture from moving from the internal environment into the timber structure? And does the tanking act also as an air tightness layer? Or, should I install a vapour barrier / air tightness membrane prior to slabbing. I should point out that the shower takes up the entire external wall of this room and therefore the waterproofing system will be applied to all of this exterior face. Also I have asked a product rep about this and he was unable to give me any assurances, however he did say that it was the first time he had been asked.

    Thanks in advance for your help

    David


Comments

  • #2
    Safehands
    Registered Users, Registered Users 2 Posts: 1,360 ✭✭✭Safehands


    greenfit wrote: »
    Hi all I am installing a new shower / wet room in a timber frame house. Due to some damp (from a leak) I have stripped back to the external timber structure and I am now about to build up the insulation, plasterboard, tiling, etc. I hope to use a liquid application tanking system (ardex or similar) which is painted on to the plasterboard prior to tiling. My query is: does this waterproof layer act also as a vapour barrier that prevents moisture from moving from the internal environment into the timber structure? And does the tanking act also as an air tightness layer? Or, should I install a vapour barrier / air tightness membrane prior to slabbing. I should point out that the shower takes up the entire external wall of this room and therefore the waterproofing system will be applied to all of this exterior face. Also I have asked a product rep about this and he was unable to give me any assurances, however he did say that it was the first time he had been asked.

    The liquid membrane you want to apply needs to be flexible, resistant to positive water pressure and compatable with the tiling adhesive you are going to use. The vapour barrier you refer to usually applies a coating's permeability to moisture vapour in a structure behind the coating. Most good data sheets will have figures on transmission of vapour through the coating. Waterproofing in this situation is a little different. A good coating will stop water and vapour from getting though on the positive side.

    Look up "waterproof coatings" or "liquid vapour membranes", on Google and you will get a range of different suppliers.
    I hope this helps.


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