Re: Copper size for bathroom
Posted by Deb on December 29, 2003 at 11:12:03:
In response to Re: Copper size for bathroom
: I am tapping into 3/4" copper to plumb a new bath. What are guidelines for when I can drop to 1/2" pipe? Is there a length vs. GPM for each size? I am most concerned about shower/bathtub combo as I want adequate pressure. The single sink I am sure would be fine with 5' of 1/2".

: What is standard shower head GPM?

: Thanks!
: Jim

There is no length versus gpm rule (per se). Pipe sizes (diameters) are generally figured by fixture units, an arbitrary number given to fixtures based on their water usage.
Run a 3/4 cold and a 1/2 hot. You can go to 1/2" on the cold after you have pulled 1 fixture off. New shower heads put out only 2.5 gpm at 80 psi.
The Pipewench

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