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Can all vents be tied into 3-inch stack? (House)

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  • Can all vents be tied into 3-inch stack? (House)

    Just curious.
    In a house, rather than have additional perforations through the roof and unsightly roof jacks, can all vents be brought through the attic and tied into the single 3-inch stack? (As long as minimum 1/8 inch rise per foot can be maintained.)

    Thank you.

    Robert
    I'd take an educated guess - but I'm unqualified.
    It ain't just soot, it's paydirt.
    "I swear, wherever Gift goes, argument follows." -Youtube comment

  • #2
    Re: Can all vents be tied into 3-inch stack? (House)

    Theoretically, yeah. But practically, it's a service plumber's nightmare.
    And it can be a costly job to run the vents that way in T & M.
    We aren't required to use 3" vents anymore on most residential jobs.
    IMO most folks don't really care about exposed roof vents anyway.

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    • #3
      Re: Can all vents be tied into 3-inch stack? (House)

      I belive Colorado requires one 3" primary vent and all the rest can be studor vents.

      Comment


      • #4
        Re: Can all vents be tied into 3-inch stack? (House)

        the total cross sectional area has to be equal or greater to the building drain. so if there's a 4'' sewer line going out, then you need 4'' of vent.

        in theory it can be done in 1 vent, but unless all the fixtures are in the same location, then it's not practical.

        some communities have their own codes/ hoa standards that require no vents to visible from the street. so all the vents are rolled back towards the rear of the house, but not combined.

        rick.
        phoebe it is

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        • #5
          Re: Can all vents be tied into 3-inch stack? (House)

          Originally posted by Kevin Jones View Post
          I belive Colorado requires one 3" primary vent and all the rest can be studor vents.
          For an island sink I had planned, I recall Denver wanted me to pipe a vent down to the drain line and then a vent to a wall and up and outside.
          They would not allow a Studor vent. (Even one UPC approved. Some did not even have UPC approval.)
          This house had 3-inch cast iron entering from the crawl space. Also had a large grease trap!
          I'd take an educated guess - but I'm unqualified.
          It ain't just soot, it's paydirt.
          "I swear, wherever Gift goes, argument follows." -Youtube comment

          Comment


          • #6
            Re: Can all vents be tied into 3-inch stack? (House)

            Originally posted by Robert Gift View Post
            For an island sink I had planned, I recall Denver wanted me to pipe a vent down to the drain line and then a vent to a wall and up and outside.
            They would not allow a Studor vent. (Even one UPC approved. Some did not even have UPC approval.)
            This house had 3-inch cast iron entering from the crawl space. Also had a large grease trap!
            Sounds like an Island vent. Here is a picture for you.

            Ron Hasil Lic #058-160417
            A-Archer Sewer & Plumbing specializing in:
            Tankless Water Heaters | Drain and Sewer Cleaning
            Sump and Ejector Pumps | Backflow RPZ Testing

            Comment


            • #7
              Re: Can all vents be tied into 3-inch stack? (House)

              ron, your stock photo is lacking a cleanout for the vent riser to protect the portion running horizontal under the house. aka a flat vent.

              other than snaking from the roof, it's impossible to clean the horizontal vent under the floor.

              install a cleanout at the wall vent riser.

              rick.
              phoebe it is

              Comment


              • #8
                Re: Can all vents be tied into 3-inch stack? (House)

                Originally posted by PLUMBER RICK View Post
                ron, your stock photo is lacking a cleanout for the vent riser to protect the portion running horizontal under the house. aka a flat vent.

                other than snaking from the roof, it's impossible to clean the horizontal vent under the floor.

                install a cleanout at the wall vent riser.

                rick.
                Wow! Picky. (Good observation!)
                So how is one to clean the flat vent?
                Surely they do not want a cleanout in the wall, do they?
                I'd take an educated guess - but I'm unqualified.
                It ain't just soot, it's paydirt.
                "I swear, wherever Gift goes, argument follows." -Youtube comment

                Comment


                • #9
                  Re: Can all vents be tied into 3-inch stack? (House)

                  Robert Gift:>>>Wow! Picky. (Good observation!)
                  So how is one to clean the flat vent?
                  Surely they do not want a cleanout in the wall, do they?<<<

                  Thats exactly what they want, usually you put a chrome cover plate on them.

                  Comment


                  • #10
                    Re: Can all vents be tied into 3-inch stack? (House)

                    Originally posted by SewerRatz View Post
                    Sounds like an Island vent. Here is a picture for you.


                    And then make those fittings work when you have 2"x10" floor joists and the kitchen line has to run 20' @ 1/4" PFP over two steel beams to the main at the front of the house and the island is in the middle of a finished basement.
                    Steve in the trade since 73 doing new residential/Commercial work

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