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  • Pipe Insulation Requirements

    Trying to find out if there is a specific r-value or material type of hot water pipe insulation that is required in residential application here in California. Not finding anything in code book, maybe just overlooking it. I'm assuming my supplier is selling me the right stuff, just want to be informed.

    Thanks wookie

  • #2
    Re: Pipe Insulation Requirements

    On cryogenic piping the insulation is some times thicker than the diamater of the pipe

    Comment


    • #3
      Re: Pipe Insulation Requirements

      Originally posted by TozziWelding View Post
      On cryogenic piping the insulation is some times thicker than the diamater of the pipe
      Cryogenic?

      Sound engineer on a penthouse
      3/4" microloc on everything.
      Including the 160' of 2" "L" supplying the heat pumps for the master bed and bath.

      Wookie,
      All we've ever been required is the HOT RECIRCULATING LOOP only NO Branches.

      That and the riser out the top of the heater.

      Comment


      • #4
        Re: Pipe Insulation Requirements

        Originally posted by drtyhands View Post
        Cryogenic?

        Sound engineer on a penthouse
        3/4" microloc on everything.
        Including the 160' of 2" "L" supplying the heat pumps for the master bed and bath.

        Wookie,
        All we've ever been required is the HOT RECIRCULATING LOOP only NO Branches.

        That and the riser out the top of the heater.
        Biding a repipe, city has said all hot water pipe to be insulated. House built in 1969 with copper under slab, repiping in copper. 2 story 3bath. Didn't think to ask city specifics thought I'd find info in code.Thanks

        wookie

        Comment


        • #5
          Re: Pipe Insulation Requirements

          title 24 i believe addresses the insulation values.

          rick.
          phoebe it is

          Comment


          • #6
            Re: Pipe Insulation Requirements

            The following is a cut and paste from the residential CA Title 24 2005 (currently in effect) that you can download here: http://www.energy.ca.gov/title24/200...rds/index.html

            5.2.3 Pipe Insulation
            §150(j)2 Pipe Insulation
            Pipe insulation is a mandatory requirement in the following cases:
            -
            Storage tanks for a non-recirculating system must have pipe
            insulation on both hot and cold water pipes for a length of five ft.
            There is no exception for water heater piping in the conditioned
            space.

            -Recirculating sections of domestic hot water systems must be
            insulated (the entire length of piping, whether buried or
            exposed).

            -Indirect fired domestic hot water system piping from the heating
            source to the storage tank.
            Piping
            exempt from the mandatory insulation requirement includes:

            -Factory installed piping within space conditioning equipment.

            -Piping that penetrates framing members is not required to have

            insulation where it penetrates the framing. However, if the
            framing is metal then some insulating material must prevent
            contact between the pipe and the metal framing.
            -Piping located within exterior walls other than for a recirculation
            loop, does not need to be insulated if all the requirements for
            Insulation Installation Quality are met (See Appendix ACM RH-
            2005 in the
            Residential ACM Manual).

            -Piping located in the attic does not need pipe insulation if it is
            buried by at least 4 in. of ceiling insulation.

            -Piping that serves process loads, gas piping, cold domestic
            water piping (other than within five feet of the water heater),
            condensate drains, roof drains, vents, or waste piping.
            Other installation information:

            -No insulation should be installed closer than six in. from the
            flue. If possible, bend the pipe away from the flue. Otherwise, it
            may be necessary to stop pipe insulation short of the storage
            tank (see
            2001 California Mechanical Code, Chapter 3, Table 3-
            3).

            -All pipe insulation seams should be sealed.

            -Installed piping may not be located in supply or return air
            plenums.

            -Hot and cold water piping, when installed in parallel runs should
            be a minimum of 6 in. apart.

            -If a fire wall interrupts the first 5 ft of pipe, the insulation may be
            interrupted at the wall and continued on the other side.

            Figure 5-1 – Meeting Pipe Insulation Requirements for Storage Tank Water
            Heaters
            Table 150-B
            Where insulation is required as described above, one in. of R-4 insulation is typically required. This requirement applies to domestic hot water pipe (above 105° F) when the pipe diameter is two in. or smaller, the water temperature is between 105°F and 201°F, and the insulation conductivity between 0.24 and 0.28 Btu-in/hr-ft2-°F (typical of cellular foam pipe insulation material). One and one half in. insulation is required on pipes greater than 2 in.

            Comment


            • #7
              Re: Pipe Insulation Requirements

              Originally posted by JamesE View Post
              The following is a cut and paste from the residential CA Title 24 2005 (currently in effect) that you can download here: http://www.energy.ca.gov/title24/200...rds/index.html

              5.2.3 Pipe Insulation
              §150(j)2 Pipe Insulation
              Pipe insulation is a mandatory requirement in the following cases:
              -
              Storage tanks for a non-recirculating system must have pipe
              insulation on both hot and cold water pipes for a length of five ft.
              There is no exception for water heater piping in the conditioned
              space.

              -Recirculating sections of domestic hot water systems must be
              insulated (the entire length of piping, whether buried or
              exposed).

              -Indirect fired domestic hot water system piping from the heating
              source to the storage tank.
              Piping
              exempt from the mandatory insulation requirement includes:

              -Factory installed piping within space conditioning equipment.

              -Piping that penetrates framing members is not required to have

              insulation where it penetrates the framing. However, if the
              framing is metal then some insulating material must prevent
              contact between the pipe and the metal framing.
              -Piping located within exterior walls other than for a recirculation
              loop, does not need to be insulated if all the requirements for
              Insulation Installation Quality are met (See Appendix ACM RH-
              2005 in the
              Residential ACM Manual).

              -Piping located in the attic does not need pipe insulation if it is
              buried by at least 4 in. of ceiling insulation.

              -Piping that serves process loads, gas piping, cold domestic
              water piping (other than within five feet of the water heater),
              condensate drains, roof drains, vents, or waste piping.
              Other installation information:

              -No insulation should be installed closer than six in. from the
              flue. If possible, bend the pipe away from the flue. Otherwise, it
              may be necessary to stop pipe insulation short of the storage
              tank (see
              2001 California Mechanical Code, Chapter 3, Table 3-
              3).

              -All pipe insulation seams should be sealed.

              -Installed piping may not be located in supply or return air
              plenums.

              -Hot and cold water piping, when installed in parallel runs should
              be a minimum of 6 in. apart.

              -If a fire wall interrupts the first 5 ft of pipe, the insulation may be
              interrupted at the wall and continued on the other side.

              Figure 5-1 – Meeting Pipe Insulation Requirements for Storage Tank Water
              Heaters
              Table 150-B
              Where insulation is required as described above, one in. of R-4 insulation is typically required. This requirement applies to domestic hot water pipe (above 105° F) when the pipe diameter is two in. or smaller, the water temperature is between 105°F and 201°F, and the insulation conductivity between 0.24 and 0.28 Btu-in/hr-ft2-°F (typical of cellular foam pipe insulation material). One and one half in. insulation is required on pipes greater than 2 in.

              Thank you! I still can't find the info in my 2007 plumbing code title 24 part 5

              When I googled and pulled up CA. Energy Commission the info page I needed said coming soon. So thanks for the link. Nice to have regs to refer to when questioned by inspector

              wookie

              Comment


              • #8
                Re: Pipe Insulation Requirements

                When using close cell insulation R-4 equates to 3/4" wall in copper tube sizes 5/8" thru 1-1/8".
                Last edited by Plumbus; 09-01-2009, 06:20 PM.

                Comment

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