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Dampness and mould, even after getting house insulated

  • 06-12-2018 4:30pm
    #1
    J0hnick
    Registered Users, Registered Users 2 Posts: 729 ✭✭✭


    Hi,


    I have visible dampness and mould in 2 rooms upstairs in my house. I had insulation pumped in back in 2011 and whilst the house is much warmer now, I'm still getting mould in both these rooms. One is my main bedroom and the other is my office, strangely enough the spare bedroom next to the office isn't affected.


    All 3 rooms have vents and all 3 are opened, checked the attic and its bone try. I spoke to a carpenter friend living on the same street as me and he is having the same issue in his house, he thinks its cold bridging, and said the plaster boards used may not have been insulated ones.


    Will upload pictures shortly, does anyone know what could be causing this ?, thanks in advance.


Comments

  • #2
    J0hnick
    Registered Users, Registered Users 2 Posts: 729 ✭✭✭J0hnick


    http://imgur.com/gallery/mBUxkj3


  • #3
    Lumen
    Registered Users, Registered Users 2 Posts: 31,222 ✭✭✭✭Lumen


    That looks like penetrating damp or a leak.

    More insulation isn't the answer.


  • #4
    listermint
    Registered Users, Registered Users 2 Posts: 34,216 ✭✭✭✭listermint


    Lumen wrote: »
    That looks like penetrating damp or a leak.

    More insulation isn't the answer.

    If that's the ceiling then your most likely missing insulation directly above it in the attic space. Moisture is hitting that cold spot on the ceiling and condensing.

    Mould then grows.


    Check the insulation level directly above it in attic


  • #5
    Lumen
    Registered Users, Registered Users 2 Posts: 31,222 ✭✭✭✭Lumen


    Oh yeah, which way up is that picture supposed to be?


  • #6
    J0hnick
    Registered Users, Registered Users 2 Posts: 729 ✭✭✭J0hnick


    Lumen wrote: »
    Oh yeah, which way up is that picture supposed to be?


    Top left corner of the bedroom, facing the outside wall.


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  • #7
    dok_golf
    Registered Users, Registered Users 2 Posts: 1,090 ✭✭✭dok_golf


    What Listermint said. Common problem where the insulation isn't pumped high enough. Heat is like water finding the lowest point. Heat will find the weak spot and funnel out through it. As this spot is cold, you end up with these sort of issues.


  • #8
    _Brian
    Registered Users, Registered Users 2 Posts: 18,721 ✭✭✭✭_Brian


    Was there any problem in those rooms prior to pumping the wAlls?


  • #9
    J0hnick
    Registered Users, Registered Users 2 Posts: 729 ✭✭✭J0hnick


    _Brian wrote: »
    Was there any problem in those rooms prior to pumping the wAlls?


    Cant remember to be honest.


  • #10
    _Brian
    Registered Users, Registered Users 2 Posts: 18,721 ✭✭✭✭_Brian


    J0hnick wrote: »
    Cant remember to be honest.

    What ??
    You don’t remember if there was that sort of mould prior to the insulation being done??

    It’s important though to identify if it’s a structural defect or poorly installed insulation. Structurally it’s teally important to have really really good detailing with polished head insulation. I would question if it’s a good risk based on this for retrofit insulation. Any mortar snots on wall ties for example will have problems exasperated by pumped head insulation.


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