Service size pipe 3/4 or 1 inch?

kgphoto

For a one bedroom guest house that will be on a separate meter, is 3/4 supply line adequate from street meter or do I have to run 1 inch.

bigMikeB

If your talking water piping I would go with 1" polybutylene, it's very inexpensive and in case you want to add hose bibbs or anything like that in the future you'd be covered.

kgphoto

I didn't think polybutelene was still approved? I think they are going to use PVC from the meter underground for economics, but I want to transition to copper for durability once above ground, with copper in the walls except for a few areas we will run PEX due to access constraints.

bigMikeB

Poly is still the pipe of choice in NJ, not sure where you are. I don't like hard pipe underground so I would never use pvc.

Marlin

How long is the run going to be?
I prefer copper underground.

kgphoto

I am in LA. DWP uses PVC for all their feeds nowadays. I am out of it for the choice from the meter to the unit, so I am using copper to support the hose bibs, pressure regulator and to feed the guest house. Sprinklers will be on a different line.

Then copper to enter and tie in and then pex to go where it is too tough to do the copper.

ranman469

i belive la would be under the UPC code? the code would let you run 3/4" depending on the pressure and distance. double check with the inspector to be safe