plumbing runs

gregz · 2015-03-09T07:48:31+00:00

I got a bathroom. I'm adding a second downstairs right below. I know the ideal setup would have a source manifold and separate feed lines. Is there some kind of guide for the cheapskate ? Copper is currently used, although I still have to reroute existing pipes. Greg

Mar 09, 2015 22 Replies

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trader_4 11 years ago

If you have 1/2" pipe serving the whole house, I'd bet that the regulator isn't the limiting factor. I've never seen one with 1/2" fittings and they typically size the fittings to accomodate the capacity of the device. Around here, typically you have 1" pipe coming in from the street, 3/4" pipe serving major/multiple points of use in the house, 1/2" branch offs for half baths, kitchen, laundry room, etc.

It seemed there was agreement here that if you do have 1/2" going everywhere, then the safest option is to replace it with 3/4" leaving the regulator, then one branch off to the new bath with either

1/2 or 3/4 and the other branch gets connected to the existing rest of the house. If the rest of the house heads over towards the new bath anyway, then just replace that section with 3/4". That gives you 3/4" most of the way to the new bath and leaves the rest of the house mostly better off too.

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dpb 11 years ago

On 03/09/2015 11:28 PM, gregz wrote: ...

"HUGE?" is in the eye of the beholder, often. :) If it's "the way it always was" then don't have any reason to think otherwise.

I certainly wouldn't classify a 3/4" feed run to the reducing tee supply run "fancy piping"; it's pretty much a standard technique.

In particular, however, as noted before in the sidebar conversations, if this is the main feed and there's also DW (or may be in the future) or simply for resale value it can't hurt and surely can't be either very complicated to do or add much additional expense over the other to incorporate.

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