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Dry-lining mass concrete

  • 17-04-2013 9:13am
    #1
    rastamouse
    Registered Users, Registered Users 2 Posts: 1 ✭


    Hi all, long time listener first time caller, looking for some advise on dry-lining mass concrete walls.

    I am considering Insulated Plasterboard to dry line the front and rear external walls as part of a refurbishment to our newly purchased mid terraced house (typical house type of Crumlin, Drimnagh, Inchicore housing stock). Unfortunately external insulation isn't an option (too expensive) and as we are gutting the place we don't mind loosing a bit of the internal area.

    I got onto tech support of one of the larger manufactures to find out required thickness to achieve a U-Value of 0.35 (I saw in another insulation manufacturers brochure that this is the recommended value for a refurb of existing walls). I originally enquired about a system that was dabbed/bonded on to the wall, but was told this was not suitable and should only be applied to external walls that have a cavity or 'polymer' rendered solid masonry walls to prevent moisture penetration and thermal bridges. We have been advised to go with 62.5mm insulated plasterboard mechanically fixed to 25 x 47mm treated softwood battens, backed with a strip of damp proof course if there is a risk of moisture penetration.

    I have read on other threads/forums that gaps behind dry-lining can cause mold growth over time so this latest suggestion is confusing me a bit. Any advise would be greatly appreciated, or any alternatives would also be welcomed.


Comments

  • #2
    kieranhr
    Registered Users, Registered Users 2 Posts: 131 ✭✭kieranhr


    It's not the gap behind the dry-lining that causes the mould. It's warm moist air meeting a cold surface, leading to condensation. A foil-backed insulated plasterboard is usually required to act as a vapour barrier.

    If you get back on to tech support again, they can give you an analysis to check for the risk of interstitial condensation (is what you want to ask for). Most of the insulated plasterboard suppliers will provide this service for free, I believe.


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