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Attic Issue

  • 13-02-2013 6:54pm
    #1
    Mitchomagic
    Registered Users, Registered Users 2 Posts: 677 ✭✭✭


    Having an issue with my attic,with condensation.It is causing damp patches on the ceiling in the bathroom around the edges by the wall,never had an issue with it before now. There is a vent in the bathroom by the shower.

    Any ideas??
    Cheers


Comments

  • #2
    meercat
    Registered Users, Registered Users 2 Posts: 4,828 ✭✭✭meercat


    is your attic well insulated
    if so then check for ventilation points in the attic
    make sure they are not covered(allowing for air circulation)


  • #3
    NobodyImportant
    Registered Users, Registered Users 2 Posts: 585 ✭✭✭NobodyImportant


    How do you know its damp, rather than a roof leak going down onto the plasterboard?

    If its damp, its probably that there is not enough ventilation in the attic. Have you gotten into the attic to check the source?


  • #4
    Roscommon John
    Registered Users, Registered Users 2 Posts: 36 ✭Roscommon John


    Is the vent in the wall or ceiling ?


  • #5
    dathi
    Registered Users, Registered Users 2 Posts: 1,422 ✭✭✭dathi


    sounds more like a classic case of " a cold bridge" . because of the slope of the rafters in the attic the last 18 inches of the ceiling does not get the same amount of insulation as the rest of the roof, this leads it to be the coolest part of the ceiling which allows the moisture to condensate on the ceiling close to the junction with the external wall. the only solutions to this is to 1, increase the level of ventilation in the bathroom. if you have a standard timed extractor you could change it for one with a humidity switch. 2,change the insulation in the last 2 feet of attic for one with a better u value.


  • #6
    Mitchomagic
    Registered Users, Registered Users 2 Posts: 677 ✭✭✭Mitchomagic


    NobodyImportant wrote: »
    How do you know its damp, rather than a roof leak going down onto the plasterboard?

    If its damp, its probably that there is not enough ventilation in the attic. Have you gotten into the attic to check the source?

    its on 2 walls working its way round to the 3rd,have checked the attic/pipes,etc
    cant see any vents in the attic


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  • #7
    Mitchomagic
    Registered Users, Registered Users 2 Posts: 677 ✭✭✭Mitchomagic


    Roscommon John wrote: »
    Is the vent in the wall or ceiling ?

    Wall,


  • #8
    Mitchomagic
    Registered Users, Registered Users 2 Posts: 677 ✭✭✭Mitchomagic


    dathi wrote: »
    sounds more like a classic case of " a cold bridge" . because of the slope of the rafters in the attic the last 18 inches of the ceiling does not get the same amount of insulation as the rest of the roof, this leads it to be the coolest part of the ceiling which allows the moisture to condensate on the ceiling close to the junction with the external wall. the only solutions to this is to 1, increase the level of ventilation in the bathroom. if you have a standard timed extractor you could change it for one with a humidity switch. 2,change the insulation in the last 2 feet of attic for one with a better u value.

    Thanks for all the information,will check out the humidity switch,insulation,vent

    Cheers


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