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RETIRING THE 4 ' VENT , what years ????

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  • RETIRING THE 4 ' VENT , what years ????

    When did the industry switch to all 2" and 1 1/2" roof vents on residential homes?
    Here in S.F. at least one vent has to be sized no smaller than the lateral [ side sewer ].
    Just curious, Thanks Tool
    Last edited by toolaholic; 02-07-2010, 01:54 AM.
    I can build anything You want , if you draw a picture of it , on the back of a big enough check .

  • #2
    Re: RETIRING THE 4 ' VENT , what years ????

    WOW -

    Where did you see this?

    Comment


    • #3
      Re: RETIRING THE 4 ' VENT , what years ????

      That's and interesting question; In my experience in SoCal and CenCal, The early '80's code class taught me as long as all vents were code minimum and equalled the cross sectional area of the sewer then it was correct. If only one fixture in the building the vent must still equal the sewer pipe size.

      Comment


      • #4
        Re: RETIRING THE 4 ' VENT , what years ????

        We have to have a minimum 3" main VTR here. If we anothe VTR it maybe no less than 2".

        Comment


        • #5
          Re: RETIRING THE 4 ' VENT , what years ????

          Minimum 3" for roof penetrations. Anything less is going to create a frost cap.

          Toilets are 3 on 3, 4 toilets in the house you have to bring 4" to the first one, size down from there.

          Based off maximum DFU load, not minimum.
          Northern Kentucky Plumbers Twitter Feed | Plumbing Videos

          Comment


          • #6
            Re: RETIRING THE 4 ' VENT , what years ????

            For a while Florida thought about one full size stack per street. They also thought about three quarter inch vents.I am very happy they only thought about doing this.

            Comment


            • #7
              Re: RETIRING THE 4 ' VENT , what years ????

              "At least one vent has to be same as main" makes no sense to me.
              All it would be is a redundant cleanout for the exterior one provided for reaching the lateral.

              I could understand the full size vent through the roof if it was end of the run,which actually raises the question why aren't they at the end of all branches.Pretty unrealistic.We have wall/exterior cleanouts,why the roof.

              Unless they are trying to minimize penetrations by suggesting the plumber run vents,that are close enough,to the oversized three inch.

              Comment


              • #8
                Re: RETIRING THE 4 ' VENT , what years ????

                For us here in Alberta, as well as most other places in Canada, especially in colder climates like mine, or Vince's for that matter, vents have to be increased to 4" when penetrating the roof to avoid frost cap. Even an 1 1/2 vent for a kitchen sink must be up-sized to 4". I see older houses with small vents and they usually have footprints leading up to the vents in the snow from the homeowners clearing them out.

                Comment


                • #9
                  Re: RETIRING THE 4 ' VENT , what years ????

                  4' is huge!

                  J.C.

                  Comment


                  • #10
                    Re: RETIRING THE 4 ' VENT , what years ????

                    Originally posted by toolaholic View Post
                    When did the industry switch to all 2" and 1 1/2" roof vents on residential homes?
                    Here in S.F. at least one vent has to be sized no smaller than the lateral [ side sewer ].
                    Just curious, Thanks Tool
                    The IPC has only required one 2" vent as the main vent on residential construction for some time.

                    J.C.

                    Comment


                    • #11
                      Re: RETIRING THE 4 ' VENT , what years ????

                      Originally posted by JCsPlumbing View Post
                      The IPC has only required one 2" vent as the main vent on residential construction for some time.

                      J.C.
                      We're under U.P.C. Our work in S.F. is upc and their [sf] extensive amendments.
                      I can build anything You want , if you draw a picture of it , on the back of a big enough check .

                      Comment


                      • #12
                        Re: RETIRING THE 4 ' VENT , what years ????

                        Originally posted by JCsPlumbing View Post
                        4' is huge!

                        J.C.
                        It gets cold here! It can get to -40 or -50 Celsius on really cold days but on average its like -10 to -20. When I lived in Yellowknife, which is at about the same latitude as Vince's Rankin Inlet, they required 4" vents too, but 4" was just made where I live recently. Some older houses in both towns had 3".

                        Comment


                        • #13
                          Re: RETIRING THE 4 " VENT , what years ????

                          Originally posted by toolaholic View Post
                          When did the industry switch to all 2" and 1 1/2" roof vents on residential homes?
                          Here in S.F. at least one vent has to be sized no smaller than the lateral [ side sewer ].
                          Just curious, Thanks Tool
                          Your question is not well presented as the industry has never gone to all 2" and 1 1/2" vents but I assume you are asking when the UPC went away from a full size vent stack.

                          .....and the UPC answer is.....1958.

                          1955 UPC

                          Sec. 504 — Size of Vents
                          .(a) Each building in which drainage piping is installed and
                          each connection to a sewage disposal system shall have at
                          least one stack of a size equal to the main house drain extending
                          continuous from such house drain through the roof as a
                          vent.
                          EXCEPTIONS:
                          (1) When a house drain exceeds three (3") inches in size
                          such stack shall be equal in size to the largest required drainage
                          stack in the building but in no case less than three (3") inches.
                          (2) Two or more buildings located on the same lot or parcel
                          of land under one ownership, when connected to a common
                          house sewer or private sewage disposal system, may be vented
                          by means of piping sized in accordance with Table No. 3 of this
                          Chapter, provided that at least one such stack is installed to
                          vent the house sewer or private sewage disposal system.
                          (b) Except as provided in Subsection (a) of this section, the
                          size of vent piping shall be determined from its length and the
                          total of fixture units connected thereto, as set forth in Table 3
                          of this Chapter.
                          (c) Not to exceed one-third of the total permitted length of any

                          vent may be installed in a horizontal position.


                          1958 UPC

                          Sec. 504 — Size of Vents
                          (a) Each building in which drainage piping is installed and
                          each connection to a sewage disposal system shall have at
                          least one (1) stack of a size equal to the main building (house)
                          drain extending continuous from such building (house) drain
                          through the roof as a vent.
                          Exceptions:
                          (1) When a building (house) drain exceeds three (3) inches
                          in size, such stack shall be equal in size to the largest required
                          drainage stack in the building, but in no case less than three
                          (3) inches.
                          (2) Two or more buildings located on the same lot or parcel
                          of land under one ownership when connected to a common
                          building (house) sewer or private sewage disposal system,
                          may bo vented by means of piping sized in accordance with
                          Table 4-3, provided that at least one such stack is installed to
                          vent the building (house) sewer or private sewage disposal
                          system.
                          (3) In lieu of the required stack the plumbing system of
                          any building may be vented by means of piping sized in
                          accordance with Table 4-3, provided the aggregate crosssectional
                          area of the vents extending through the roof at least
                          equals the cross-sectional area of the largest required drainage
                          stack.
                          (b) Except as provided in subsection (a) of this section, the
                          size of vent piping shall be determined from its length and the
                          total of fixture units connected thereto, as set forth in Table 4-3.
                          (c) Not to exceed one-third of the total permitted length of any

                          vent may be installed in a horizontal position.


                          Mark
                          "Somewhere a Village is Missing Twelve Idiots!" - Casey Anthony

                          I never lost a cent on the jobs I didn't get!

                          Comment


                          • #14
                            Re: RETIRING THE 4 ' VENT , what years ????

                            Originally posted by Marklar89 View Post
                            It gets cold here! It can get to -40 or -50 Celsius on really cold days but on average its like -10 to -20. When I lived in Yellowknife, which is at about the same latitude as Vince's Rankin Inlet, they required 4" vents too, but 4" was just made where I live recently. Some older houses in both towns had 3".
                            I was joking as the thread title says 4', not 4".

                            It's not uncommon to require a bump in size for cold areas to prevent closing from hoar frost.

                            J.C.

                            Comment


                            • #15
                              Re: RETIRING THE 4 " VENT , what years ????

                              Originally posted by ToUtahNow View Post
                              Your question is not well presented as the industry has never gone to all 2" and 1 1/2" vents but I assume you are asking when the UPC went away from a full size vent stack.

                              .....and the UPC answer is.....1958.

                              1955 UPC

                              Sec. 504 — Size of Vents
                              .(a) Each building in which drainage piping is installed and
                              each connection to a sewage disposal system shall have at
                              least one stack of a size equal to the main house drain extending
                              continuous from such house drain through the roof as a
                              vent.
                              EXCEPTIONS:
                              (1) When a house drain exceeds three (3") inches in size
                              such stack shall be equal in size to the largest required drainage
                              stack in the building but in no case less than three (3") inches.
                              (2) Two or more buildings located on the same lot or parcel
                              of land under one ownership, when connected to a common
                              house sewer or private sewage disposal system, may be vented
                              by means of piping sized in accordance with Table No. 3 of this
                              Chapter, provided that at least one such stack is installed to
                              vent the house sewer or private sewage disposal system.
                              (b) Except as provided in Subsection (a) of this section, the
                              size of vent piping shall be determined from its length and the
                              total of fixture units connected thereto, as set forth in Table 3
                              of this Chapter.
                              (c) Not to exceed one-third of the total permitted length of any

                              vent may be installed in a horizontal position.


                              1958 UPC

                              Sec. 504 — Size of Vents
                              (a) Each building in which drainage piping is installed and
                              each connection to a sewage disposal system shall have at
                              least one (1) stack of a size equal to the main building (house)
                              drain extending continuous from such building (house) drain
                              through the roof as a vent.
                              Exceptions:
                              (1) When a building (house) drain exceeds three (3) inches
                              in size, such stack shall be equal in size to the largest required
                              drainage stack in the building, but in no case less than three
                              (3) inches.
                              (2) Two or more buildings located on the same lot or parcel
                              of land under one ownership when connected to a common
                              building (house) sewer or private sewage disposal system,
                              may bo vented by means of piping sized in accordance with
                              Table 4-3, provided that at least one such stack is installed to
                              vent the building (house) sewer or private sewage disposal
                              system.
                              (3) In lieu of the required stack the plumbing system of
                              any building may be vented by means of piping sized in
                              accordance with Table 4-3, provided the aggregate crosssectional
                              area of the vents extending through the roof at least
                              equals the cross-sectional area of the largest required drainage
                              stack.
                              (b) Except as provided in subsection (a) of this section, the
                              size of vent piping shall be determined from its length and the
                              total of fixture units connected thereto, as set forth in Table 4-3.
                              (c) Not to exceed one-third of the total permitted length of any

                              vent may be installed in a horizontal position.


                              Mark
                              Thanks for Your help Mark , Not too far from Our home,We have a 15 year
                              old development. Many Multi bath homes. Nothing over 2 "
                              I can build anything You want , if you draw a picture of it , on the back of a big enough check .

                              Comment

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