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Cold water tank in attic.

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  • 28-01-2012 9:24pm
    #1
    notaplumber
    Registered Users Posts: 27 ✭


    Hi all,

    Arrived home last week to find water leaking through the upstairs bathroom's ceiling. Went up to the attic and saw that the "Table" on which the cold water storage tank was sitting has soaked through (But only a 5cm diameter circle area), and this in turn was dripping onto attic floor, and in turn through the ceiling. The drip rate was about a drop every 3 seconds or so.

    The tank itself is a plastic type, 60/80 gallon capacity.

    Turned off water supply, emptied tank and lifted tank a few cms from it's "table".

    There was as far as I could see, no leaks from any of the outlet pipes but instead several droplets of water attached to the underside of the tank. There wasn't any hole in the bottom of the tank either.

    The leak itself has stopped since but went up again this afternoon to find more water droplets, but not enough to go beyond just soaking into the "table top".

    Any ideas, Could it be condensation? Living in the semi detatched for 9 years, never had an issue with it before, and as I say, its a plastic type tank, and all the outlet pipes seem to be sound, with no leaks from them. There is also plenty of insulation around the sides of the tank, but none underneath, or on top where the cover lies.

    Thanks in advance.:)
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    #2
    Marcanthony
    Closed Accounts Posts: 450 ✭✭Marcanthony


    is the expansion pipe going directly into the tank and no possibility it can pitch water outside the tank. (expansion pipe is the one that has an open end pipe bent over the tank)
    I have seen problems over the years where the roof was leaking and water was depositing through the felt directly above the tank. was it raining in your region last night?
    also extractor fans from en suites and bathrooms with vents left open in the attic (creating condensation).
    you can insulate the top of the tank with insulation (kingspan). However not insulating the bottom of the tank will help stop tank from frezzing.
    check the felt in your attis to see if it feels wet. (due to condensation)

    usually when the weather is warm and you get a frosty night condensation can happen.is the pipework insulated in your attic. does the mains pipe feeding the tank feel wet.

    your problem could be a lack of ventilation within the attic and/or caused from rooms below.

    if not one of the above. strip the insulation from around the tank and make a visual inspection while the tank is full.


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