Normally you can run two plumbing fixtures on 1/2"
A bathroom set would need 3/4" on the cold and 1/2" for the hot.
House was built in the 20's. Piping going to second floor bathroom (shower/toilet/sink) is galvanized. At some point before we bought the house, most of the basement feed lines were re-plumbed using PEX and crimp rings.
My question is twofold...
Most of the supply lines are 3/4", dropping to 1/2 inch to feed the kitchen, first floor bath, hose bibs, etc... for some reason, they also dropped to 1/2" to feed the 2nd floor lav, dropping to 1/2" and connecting to 3/4" galvanized heading up stairs.
Question 1. Is there any reason to downsize the supply to 2nd floor lav? Or was the installer just sloppy? Would upsizing to 3/4" make a difference? The water pressure is ok, not great, and cant use more than one item at a time.
Question 2. How do you switch out PEX like this? Can the rings be removed preserving the pipe, or am I looking at having to replace entire sections? I've never worked with PEX, so I would have to invest in all of the tools, but I also don't know any of the rules for working with it.
Thanks in advance!