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Mould on a newly dry lined wall.

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  • 12-12-2023 5:51pm
    #1
    spunkymunky
    Registered Users Posts: 674 ✭✭✭


    Hi,

    I'm seeing mould on the external wall in the box room. Only seen on this wall. The room window faces east and the wall in question is north facing towards the neighbouring house.

    Some background. We’ve had the whole house internally dry lined and skimmed. To go with this, we are upgrading the heating and plumbing (so no electricity and heating in the house for the last 6ish weeks). Also, the insulation in the attic has been thrown out as we are upgrading it. So it’s a cold place to be. Id say the room was skimmed 4 weeks ago and took about 2 weeks to dry.

    Wondering if this is something to worry about? The builder says it is fine as there has been no heating on and the plaster has been drying, introducing moisture. He says once we warm the house, this will not be an issue.

    Should we be worried?

    Thanks

    WhatsApp Image 2023-12-12 at 14.54.11.jpeg


    Post edited by spunkymunky on


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    #2
    listermint
    Registered Users Posts: 33,620 ✭✭✭✭listermint


    You need to ventilate the space. As the plaster dries it needs the moisture to escape outdoors. It can't so it's condensing or staying on this surface turning to mould.

    Ventilation and heat should sort. But make sure get on it ASAP. You'll prob have to seal the wall with a mould paint when dry.



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    #3
    sydthebeat
    Subscribers Posts: 41,003 ✭✭✭✭sydthebeat


    the space should be consistently ventilated, especially when teh heat is not on



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    #4
    mickdw
    Registered Users Posts: 23,261 ✭✭✭✭mickdw


    I see this in new builds all the time during the drying out phase. Never used to see it in the times when we had vents in the walls so that I suppose is the answer.

    Plenty ventilation via open windows recommended during drying out phase.



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    #5
    spunkymunky
    Registered Users Posts: 674 ✭✭✭spunkymunky


    Thanks for the responses.

    I don't think the windows have been open much while the lads were working (tis winter after all). Hoping once we get in and get the heating on, this will help. Will get them to make sure the wall is has been cleaned up (decontaminated).



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    #6
    sydthebeat
    Subscribers Posts: 41,003 ✭✭✭✭sydthebeat


    The windows should be open a inch or two through the whole build. The house MUST dry out.

    Your builders should have no say in the matter, and anyway, if they are good builders they should understand the reason for this

    Post edited by sydthebeat on


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    #7
    spunkymunky
    Registered Users Posts: 674 ✭✭✭spunkymunky


    The plaster is now dry throughout. Just took a while.

    House is on a road so didnt want front windows open as we are not there most of the time. Have asked builder to open during the day, so will help. Heating should be connected this week, so can get that going to aid the drying.



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    #8
    mickdw
    Registered Users Posts: 23,261 ✭✭✭✭mickdw


    https://www.boards.ie/discussion/comment/121490078#Comment_121490078

    Even more important to get some ventilation going when heat is on.



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