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Venting sewer in a new build

  • 23-03-2020 1:41pm
    #1
    muddle84
    Registered Users, Registered Users 2 Posts: 1,769 ✭✭✭


    Using 4 inch wavin for the upstairs sewers coming from the en suite and we are going to vent the pipe into a vent tile in the roof. Just wondering do we have to use rigid 4 inch pipe for the vent or is it ok to use flexible pipe seeing as it is just for ventilation? The house is a story and a half with a 43 degree roof pitch so flexible pipe running up along the rafters would be alot easier to install!


Comments

  • #2
    Outkast_IRE
    Registered Users, Registered Users 2 Posts: 7,516 ✭✭✭Outkast_IRE


    It would always be solid pipe the flex would collapse easily under any negative pressurisaton which can occurs when wcs are flushed etc.


  • #3
    muddle84
    Registered Users, Registered Users 2 Posts: 1,769 ✭✭✭muddle84


    Any help would be greatly appreciated! It can be done with the rigid 4 inch but its in a tight spot in the crawl space.


  • #4
    muddle84
    Registered Users, Registered Users 2 Posts: 1,769 ✭✭✭muddle84


      Outkast_IRE wrote: »
      It would always be solid pipe the flex would collapse easily under any negative pressurisaton which can occurs when wcs are flushed etc.

      Great! Thanks a million for that, makes sense!


    1. #5
      Outkast_IRE
      Registered Users, Registered Users 2 Posts: 7,516 ✭✭✭Outkast_IRE


      muddle84 wrote: »

        Great! Thanks a million for that, makes sense!
        Is it the only vent on the system , if there is another vent on the system anywhere else you would be allowed to put an air admittance in the attic . If it's the only vent you require it .


      1. #6
        muddle84
        Registered Users, Registered Users 2 Posts: 1,769 ✭✭✭muddle84


        Outkast_IRE wrote: »
        Is it the only vent on the system , if there is another vent on the system anywhere else you would be allowed to put an air admittance in the attic . If it's the only vent you require it .

        There is another ensuite off the same line but the plumber is saying that it doesn't need to be vented. Is that right or should that have an air admittance valve on it?


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      3. #7
        Outkast_IRE
        Registered Users, Registered Users 2 Posts: 7,516 ✭✭✭Outkast_IRE


        muddle84 wrote: »
        There is another ensuite off the same line but the plumber is saying that it doesn't need to be vented. Is that right or should that have an air admittance valve on it?

        It depends on distance to the vent stack. If its a short distance you may be ok. If its a bit of a run i would allow for air admittance valve.


      4. #8
        muddle84
        Registered Users, Registered Users 2 Posts: 1,769 ✭✭✭muddle84


        Outkast_IRE wrote: »
        It depends on distance to the vent stack. If its a short distance you may be ok. If its a bit of a run i would allow for air admittance valve.

        Ok will chat to the plumber about that so! Thanks for the help, does the air admittance valve just go into the attic and doesn't need to be put outside?


      5. #9
        Outkast_IRE
        Registered Users, Registered Users 2 Posts: 7,516 ✭✭✭Outkast_IRE


        muddle84 wrote: »
        Ok will chat to the plumber about that so! Thanks for the help, does the air admittance valve just go into the attic and doesn't need to be put outside?

        In the attic is fine but make sure its somewhere accessible they many need to be replaced eventually. And as stated can only be put in if you have a Vent to atmosphere elsewhere.


      6. #10
        Sleeper12
        Registered Users, Registered Users 2 Posts: 17,189 ✭✭✭✭Sleeper12


        I've had the miss fortune to come across many attics where the flexible ducting has fallen down. The flexible isn't a good idea


      7. #11
        muddle84
        Registered Users, Registered Users 2 Posts: 1,769 ✭✭✭muddle84


        The attic must stink then does it?


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