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  • pex-conventional or mainfold

    I am currently in the process of building a house and getting ready to start the plumbing. I am using pex with copper fittings at the shut off valves. My plumber who is assisting me wants to plumb the house like a conventional copper system. I have come accrss many houses that have a manifold system with homeruns for all the pex. I want to make sure I get the best possible system with the best pressure everywhere(especially since I have a well which yields about 10-12 gpm) and I am wondering which way is better to plumb the system

  • #2
    Re: pex-conventional or mainfold

    Originally posted by skkipp View Post
    I am currently in the process of building a house and getting ready to start the plumbing. I am using pex with copper fittings at the shut off valves. My plumber who is assisting me wants to plumb the house like a conventional copper system. I have come accrss many houses that have a manifold system with homeruns for all the pex. I want to make sure I get the best possible system with the best pressure everywhere(especially since I have a well which yields about 10-12 gpm) and I am wondering which way is better to plumb the system
    I prefer a modified manifold system that uses smaller manifolds located near the fixtures. Much less expensive and uses less pipe.
    sigpic

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    • #3
      Re: pex-conventional or mainfold

      I have done all of my homes the conventional method. However, ensuring that there is no more than one fixture on a 1/2" line. Typically running 3/4" to the tub/showers and whirlpool tubs. (You never know when someone may want to add body sprays, multiple heads, etc.) Just make sure you have a couple of recirculation lines ran at the same time. If your water heater is on a downstairs level and your fixtures are on an upper level, you will get a recirculation just through convection and will not need a recirculation pump.
      Distractions are everywhere, don't lose sight of your dream.

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      • #4
        Re: pex-conventional or mainfold

        Manifolding option is one of the reasons I really love Pex.

        It guarantees equal water to all fixtures. It also allows you to shut down one fixture at a time, say you have an emergency, and it's 10pm, no one wants to call a plumber at 10pm, so shut the fixture down and wait till morning, and continue to have water in other areas of the house.

        Pex and manifold, the only way I would run pex.
        sigpic

        Robert

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        • #5
          Re: pex-conventional or mainfold

          Manifold is the only way to go if the money is there ( manifold or manifolds and return lines will add a few dollars to the project) Conventional is the cost effective way and you miss out on the manifold advantages...

          As a side note.
          Is PEX pipe allowed to be used in California yet? Last I heard it was still in the courts?

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          • #6
            Re: pex-conventional or mainfold

            Another advantage to a manifold system is the elimination of fittings behind walls. Remember that pex is not copper and a properly installed pex system won't look the same. If done right, you'll have a joint at the manifold and and at the stub out.
            Buy cheap, buy twice.

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            • #7
              Re: pex-conventional or mainfold

              Originally posted by OkieBill View Post
              Manifold is the only way to go if the money is there ( manifold or manifolds and return lines will add a few dollars to the project) Conventional is the cost effective way and you miss out on the manifold advantages...

              As a side note.
              Is PEX pipe allowed to be used in California yet? Last I heard it was still in the courts?

              Approved Jan 1st

              I am signed to take the certification, although I have installed systems for new construction out of state.

              I will still check with the city I am working in to make sure they are ok with it. I doubt I will be doing full repipes with it, but maybe recirculation loops, or relocation.

              Just another option I can offer the customer if they do not want the expense of copper. I still believe copper and solder is the best.

              Rehau is my favorite as far as pex is concerned.
              sigpic

              Robert

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              • #8
                Re: pex-conventional or mainfold

                Thank you all for your advice and help

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                • #9
                  Re: pex-conventional or mainfold

                  Originally posted by westcoastplumber View Post
                  .

                  Rehau is my favorite as far as pex is concerned.

                  It's my favorite as well. A bit more expensive but well worth it. I just did a 121 suite apartment complex in Rehau and had no leaks. But the biggest advantage is that I could confidently let the drywall begin if I was behind in my testing.

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