pex layout like copper OR the manifold method

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by phantom, Feb 19, 2007.


Copper Layout or Manifold

Poll closed Mar 21, 2007.
  1. Copper Layout

    5 vote(s)
  2. Manifold

    5 vote(s)
  1. phantom

    phantom New Member

    First of all, this has got to be the most useful website I have seen in quite some time. exactly what i needed to read up and I sincerely appreciate all that everyone has contributed so far. Unfortunately, I am a novice at this so I will be "using" more than "providing".

    I just got an estiamte for an "easy" galvanized repipe that was $5k :eek: . I'm quickly becoming a DIY kinda guy. Here is my dilema. I am going to replace my pipes with pex. I think that there are two varying methods, the "main" method and the "manifold" method

    Main -- my handyman wants to layout the pex like he would copper, meaning large main hot & large main cold with 1/2 inch runners going out to the sink, etc..

    Manifold -- I was thinking that we'd have a manifold with small 1/2 running from the manifold to each place water is needed.

    Other than the obvious manifold advantage "less places to crimp means less places it could leak" are there other advantages or disadvantages to either?

    Anyone know where I can get a manifold in Bellevue, WA?

    Much Thanks in advance!,
    Last edited: Feb 19, 2007
  2. kordts

    kordts In the Trades

    exurban Chicago
    Please don't have a handyman plumb. You are both breaking the law.
  3. phantom

    phantom New Member

    gosh i had no idea

    He's not doing the plumbing. I am. We disagree on how I will do the layout. Are you telling me that I can't fix the plumbing on my own house?

    what law am I breaking?
  4. Racer814

    Racer814 New Member

    no can plumb your own house as long as you pull the permit and get it inspected

    besides, running pex takes little plumbing skill anyway

    as far as which method..depends upon water heater location to me....if it is centrally located I would just do a standard installation....if it is a long way from some of the fixtures I would at least do a hot side manifold ..... you will decrease the waiting time for hot water as you won't need to run any 3/4" pipe and you can take a more direct route to each fixture

    ...and if you're gonna do the hot you might as well do the cold

    other than that I can see little advantage in a manifold
  5. Gary Slusser

    Gary Slusser That's all folks!

    IMO there are few to no advantages to branch and tee and next to no disadvantages to a manifold except a manifold takes up more space on a wall or ceiling. And looks don't impress me when I'm looking for function and practicality.

    The main advantages are; quicker and easier to install, smaller ID, wastes less hot water getting cold to run hot, higher flow rates with less pressure loss, simple install from one location, many fewer fittings etc..

    Disadvantages, you need a lot more tubing and the manifold takes up much more space.
  6. Rope Tow

    Rope Tow New Member

    Modified Manifold Method

    I'm a DIY who recently plumbed a new house - 2 and 1/2 baths - with Pex. After a bit of research, I opted for a modified manifold system. I have a distributed manifold where a 3/4" hot and cold lines goe to each bathroom, the kitchen, hose bibs, etc. It looks really simple, and each room (branch) has its own shut-offs at the manifold. The 3/4" goes to the base of each shower or sink for volume, and since its a straight shot from the manifold to the room the speed of Hot Water to each room is pretty good.

    I passed inspection.
  7. phantom

    phantom New Member


    Thanks for responding & voting. the bathroom is on the opposite side of the house from the water heater.
    looks like manifold is winning.
    Last edited: Feb 20, 2007
  8. kordts

    kordts In the Trades

    exurban Chicago
    It depends what state you are in if you can plumb without a license. I would guess most let you, I know Mass. won't let you. Good luck.
  9. dgreen1069

    dgreen1069 New Member

    Northern VA.
    I don't know anything about Pex, but here in Prince William, VA. homeowners can pull permits to do everything....including gas, electric, plumbing, mechanical, etc.
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