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Groundwater under joisted timber ground floor

  • 13-11-2016 11:48pm
    #1
    poker_pro
    Registered Users, Registered Users 2 Posts: 10 ✭


    Our house is 1950s dublin semi so joisted ground floor and about a 2 foot void underneath. Just discovered there is approx 4 inches of water sitting in it. Pumped it out and it just comes back. Checked for leaks but none found. Just wondering what my best course of action is? Thinking of taking up the floor and putting in some pipes about 6-8 inches below current clay level and diverting any rising water into the shore. Any advice or alternative solutions? Cheers.


Comments

  • #2
    K.Flyer
    Registered Users, Registered Users 2 Posts: 8,565 ✭✭✭K.Flyer


    Have a pressure test done on the mains water supply coming in from the road. I atrended a very similar issue and the mains pipe under the clay was leaking, possibly for years. We just replaced the mains with one continuous pipe from the path all the way to the kitchen, temporarily left floor boards up for extra ventilation for under the floor and a couple of dehumidifiers with the heating on and it started to dry out after a few weeks.


  • #3
    my3cents
    Closed Accounts Posts: 9,764 ✭✭✭my3cents


    With a lot of people having water meters wouldn't it be a good idea to check the meter?

    A mains leak wouldn't surprise me. Once worked on a place that had a spring running in the garden for as long as anyone could remember, there was even a land drain built to drain it. However it stopped running the second the mains was cut off one day. The problem then was finding the leak which was about 30 yards away from where the "spring" surfaced - 4inch cast iron pipe buried 5 ft down cracked all the way around and leaking about 3 gallons a second (probably less before I uncovered it).

    So even if the meter isn't moving it could still be mains water coming in from out on the street somewhere.

    If it can be done easily I'd be digging some narrow test holes in the garden to see which ones if any fill with water. If its not a leak then you might be able to do the drainage outside the house rather than inside. I'd also pump out the void space and watch for any movement to see if the water seems to come in from one area. Pumping from a shallow dug out sump might also help show where the water is coming from. Any little clues might help pin the source down. On the other hand if the water meter or other tests show a leak on your side of the meter its probably easier just to put in a new pipe rather than find the leak. If of course it is a leak?

    Could also be coming from neighbors side get their buy in and check their meter.


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