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Damp Stains on Ceiling around en-suite extractor fan

  • 19-11-2019 10:55am
    #1
    w/s/p/c/
    Registered Users, Registered Users 2 Posts: 468 ✭✭


    I have recently noticed some damp stains on the ceiling around the extractor fan in my en-suite bathroom.

    My house was a newly built one, just two years old. From looking in the attic over the weekend, I could not make head nor tail of how the water is getting in. The insulation around the pipe for the fan was loose so I re-wrapped and taped it. Was thinking that it may have been condensation running down the loose pipe.

    Has anyone ever faced anything similar or is my train of thought off, should I be looking for any other tell tale signs?

    Cheers


Comments

  • #2
    TuringBot47
    Registered Users, Registered Users 2 Posts: 991 ✭✭✭TuringBot47


    Had that in a previous house, approx 20 years old and fixed it.
    (diy job, I'm not a tradesman)

    1. The ducting that takes the damp air from the fan, up through the attic and out via the roof was not properly insulated in my attic.

    2. The extractor fan itself may not be powerful enough

    3. You may need to increase the timer on the fan to keep it running X minutes after you switch it off.

    So the hot air is condensing within the tube and dripping back down.
    It was dangerous for me as the water shorted out the fan.

    I replaced the fan with a better fan.
    Something like this
    https://www.amazon.co.uk/Envirovent-SIL100T-Silent-Bathroom-Extractor/dp/B0080XNKQ0

    There were different variations, a simple one that worked on a timer, or one with a built in hydrometer which would continue to work until the room was clear of damp air. I went with that one, the minor side effect was it would turn itself on depending on air conditions, including in the middle of the night.

    It was also a safer fan as it had some water protection around the electrics.

    Secondly, I replaced the tube with a more insulated version.
    Something like this

    https://www.amazon.co.uk/100mm-Insulated-Ducting-Recovery-Ventilation/dp/B0056GAAPS

    Didn't have a problem after that.


  • #3
    w/s/p/c/
    Registered Users, Registered Users 2 Posts: 468 ✭✭w/s/p/c/


    Thanks for that, will take a look as suggested, cheers!


  • #4
    listermint
    Registered Users, Registered Users 2 Posts: 34,173 ✭✭✭✭listermint


    Buy the duct from Amazon that was linked above. It's the only proper way to install ventilation to an attic space. If it's not this then replace it all. Cheap fix future proof


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