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Height of sewer vent stack single storey extensiom

  • 03-05-2017 1:09pm
    #1
    antiskeptic
    Registered Users, Registered Users 2 Posts: 9,555 ✭✭✭


    I need to run a sewer vent up in front of my single storey extension. How high above ground level need it be? Any other considerationsite to be aware of?

    Cheers


Comments

  • #2
    sydthebeat
    Subscribers Posts: 42,171 ✭✭✭✭sydthebeat


    http://www.housing.gov.ie/sites/default/files/migrated-files/en/Publications/DevelopmentandHousing/BuildingStandards/FileDownLoad%2C24906%2Cen.pdf

    page 10 and 11


  • #3
    antiskeptic
    Registered Users, Registered Users 2 Posts: 9,555 ✭✭✭antiskeptic


    sydthebeat wrote: »
    http://www.housing.gov.ie/sites/default/files/migrated-files/en/Publications/DevelopmentandHousing/BuildingStandards/FileDownLoad%2C24906%2Cen.pdf

    page 10 and 11

    Thanks Syd.

    Reading around, it seems I need to have the vent pipe outlet 900mm above the top of the nearest window - which would be located within the 3m limit which dictates the 900mm height separation. There's an overhanging roof (it's a tall ceilinged single storey extension at that side of the building) which would protrude over the outlet. The underside of the roof would be another 500mm above the outlet. I'd be concerned with gases meandering into the building through the TGV sheeting cladding the underside of the overhang?

    It'd be unsightly to run the pipe up the back wall, horizontally out under the overhang and up.

    (I'd have also thought there'd be an issue with a such a vent pipe on a normal height single storey extension - the outlet would be relatively low (900mm above the window) and smells could meander into the own and neighbours garden. Or perhaps that'd be fine - the issue is more air in that air out?

    I read of an air admittance valve located internally, which would be a runner. I can only fit it behind a false back of a kitchen press (4" pipe runs from there and onto the sewer. The regs don't mention anything about locating these in non habitable spaces but I've read as such about them

    The regs:

    "Air admittance valves should be located in areas
    which have adequate ventilation, should be
    accessible for maintenance and should be
    removable to give access for clearance of
    blockages. Air admittance valves should not
    be used outside buildings or in dust laden
    atmospheres."


    Any thoughts?


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