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Underfloor leak

  • 30-04-2018 8:10pm
    #1
    BluesWeeper
    Registered Users, Registered Users 2 Posts: 99 ✭✭


    Hi Everyone,

    I wonder if anyone has any experience of dealing with an underfloor heating leak?

    Recently we noticed a patch of dampness at the base of the hot press wall and hallway and on investigation found fungi growing at the base of the wall on HP side. The area between wall and floor is noticeably damp. The floor is tiled, both hallway and hotpress so it's only on the wall we can see dampness.

    The U/F manifold does not appear to be leaking and as far as we're aware there are no other water pipes in the floor at this area, just the U/F.

    So, is it possible to locate which loop is leaking, if so can that be shut down until a possible repair?

    It sounds horrendous and probable is. Has anyone experienced this and what best approach to repair?

    Thanks in advance

    Blue


Comments

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


    Are you having to regularly "top-up" the pressure on the heating system?
    If the answer is No, and you do not have an "automatic filling valve", then it is unlikely that your underfloor heating system is leaking.

    One way to find out is by using pressure testing equipment and doing each line separately.
    Another is using a thermal imaging camera and watching the lines as they heat up.


  • #3
    BluesWeeper
    Registered Users, Registered Users 2 Posts: 99 ✭✭BluesWeeper


    Thanks for the reply K.flier, No tops needed and both upstairs and downstairs have roughly same pressure.

    Will go down the Pressure Route o each line and/ or the thermal imaging then.

    is it possible to shut off each line in turn?


  • #4
    K.Flyer
    Registered Users, Registered Users 2 Posts: 8,565 ✭✭✭K.Flyer


    BluesWeeper wrote: »
    Thanks for the reply K.flier, No tops needed and both upstairs and downstairs have roughly same pressure.

    Will go down the Pressure Route o each line and/ or the thermal imaging then.

    is it possible to shut off each line in turn?

    If you are not having to top up the heating system pressure and you do not have an automatic filling valve, then you do not have a leak on your central heating / underfloor heating system.
    So you may be wasting your time looking for something that is not there.
    It depends on which type of manifolds you have as to whether individual lines can be easily shut off.
    Is there a bathroom or exterior wall adjoining the wall where you are seeing damp mould?


  • #5
    BluesWeeper
    Registered Users, Registered Users 2 Posts: 99 ✭✭BluesWeeper


    Thanks again K.Flyer , No luck so far, cant locate it to anything in particular,

    i can post a photo of the manifold if you like ,The wall is an interior wall and is not near a bathroom . A colleague has suggested it could be damaged DPC but hope not.


  • #6
    K.Flyer
    Registered Users, Registered Users 2 Posts: 8,565 ✭✭✭K.Flyer


    What type of valve do you have to fill or increase the heating system pressure with, is it automatic, or a manual valve?
    Are you having problems with the heating system loosing pressure on a regular basis?


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  • #7
    ThebitterLemon
    Registered Users, Registered Users 2 Posts: 6,671 ✭✭✭ThebitterLemon


    K.Flyer wrote: »
    If you are not having to top up the heating system pressure and you do not have an automatic filling valve, then you do not have a leak on your central heating / underfloor heating system.
    So you may be wasting your time looking for something that is not there.
    It depends on which type of manifolds you have as to whether individual lines can be easily shut off.
    Is there a bathroom or exterior wall adjoining the wall where you are seeing damp mould?

    How often is “regularly” to top up the pressure. I think our pressure starts off around 2 bars and then drops to under one over time but never completely drops off so we have no pressure. I’m hoping I don’t have a leak but the drop off in pressure and the need to top it up every (6) months or so is concerning me. Anyway of “proving” I’ve a leak.

    Thanks


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