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Positioning of Air Admittance/Durgo Valve

  • 25-05-2023 2:07pm
    #1
    ChewyLuey
    Registered Users, Registered Users 2 Posts: 232 ✭✭


    Hi All

    I have an ensuite bathroom that has had regular toxic smell since we moved in not too long ago.

    On inspection the soil pipe outside that house gable is not vented. It leaves the wall at upstairs floor level and goes straight down to sewer at a right angle with no soil stack vent section going upwards (the basin and shower waste ~2inch pipe joins it on the way.

    I suspect the vacuum effect caused by flushing is leading to the smells and as far as I know an air admittance/durgo valve is probably the answer.

    I'm wondering if there is any simple way to add this without pulling the collar out of the mortar at the right angle? Can they be added inline or on the smaller basin waste or would that be too small a size to do what it needs to?

    (Photo attached)

    soil_pipe.jpg




Comments

  • #2
    10-10-20
    Registered Users, Registered Users 2 Posts: 8,061 ✭✭✭10-10-20


    To be honest, I think it's your only option here is to pull the elbow out and replace it with a tee with a vent so that the stack is vented properly. Are you seeing that the vacuum is pulling the water out of the bottom of the bowl?



  • #3
    monseiur
    Registered Users, Registered Users 2 Posts: 1,371 ✭✭✭monseiur


    No need to interfere with soil pipe. Cut a 50mm hole in left side of soil pipe below collar but above existing strap. Fit a black or grey floplast strap to suit 50mm pipe - fit a very short piece of black 50 mm PVC/ABS pipe fit a 90 degree bend on this turned up, fit say 300mm length of pipe into top of bend with a leaf guard on top. Join all pipework using appropriate solvent/glue on the ground, then it's just a matter of climbing the ladder and pushing it into pipe strap fitting. This should be adequate as a vent. You could fit a second vent by cutting the waste pipe going into the 4'' soil pipe fitting a T and a length of pipe with leaf guard as previous.



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