supply line sizing

[apparentgenius]

Hi,

I am in the process of plumbing a new house with PEX. I have a 1" main coming into the house.

Is there a limit of how many 1/2" fixture supply lines that I can take off of a a 3/4" branch off of the main? My total fixture units on the second floor is 23 made up of 4 sinks,2 toilets, 1 tub, 2 shower heads 1 washer, 1 dishwasher.
The distance from the 1" supply line to the furthest fixture is about 30'

Any help is appreciated.

glen

http://www.terrylove.com/watersize.htm

[Plumber Jim]

That depends on how your local code reads it. here in Denver you can size it as you would copper. They don't like to see that 3/8 stuff. What is you psi ?

[apparentgenius]

Hi Plumber Jim,

The water company says that my pressure is 65 psi at the meter. If that's the case, can I feed all of that with a 3/4" line? I'm planning on using the 1" copper ported manifolds, 3/4" inlets, 1/2" outlets.

Thanks,

glen

[patrick88]

You should not have any problems with your pressure.