Originally Posted by GPV
Why rip out the existing copper? Seems that would be a waste of money and time.
Sweating pipe is easy (if it is dry). The key is the solder follows the heat. Do not heat the solder but the fitting and the solder will draw up into the fitting. After you clean and apply flux of course.
Repairing pipe that has had water in it sucks period.
Yes repairing with water sucked the big one!! Unfortunately there is more to be done.
So here is the current setup.
3/4" main comes in and splits - 3/4 to softener and 1/2" to service bathroom and house bibb. So we have 4 fixtures on one 1/2" branch line (with a few bad elbows in need of replacement. New bath is under old, and we can't tie into existing because it is 1/2" pipe. So we need a new 3/4" line for cold to the area.
From softener goes 3/4" to water heater, water heater out goes 3/4" back to about where the softener is, then splits to service kitchen and it comes back on 1/2" to halfway to where the water heater is and then crosses back to the other side of the house and picks up the current fixtures in the bathroom upstairs. In total there is maybe an extra 15-20' of copper our water needs to run through before we get hot in the bath. So we can't run the new bath hot off that line either. So that means another new 3/4" line. Plus there are a couple elbows in need of replacement.
Here is the current idea.
3/4" main comes in and to softener, then to water heater. New 3/4 pex trunk comes off near the input to the water heater and will service old and new bath cold fixtures. A new 3/4 pex trunk comes off after hot exits water heater and will service old and new bath. These new lines will remove 45-50 feet of old copper that has been in the house since the 50's. At least we can recycle for some cash. Both trunks would be connected to a copper manifold in the ceiling and individual branch lines will service the fixtures.
Between having some current code compatibility issues, old lines and hard water to the bath areas, it seems to make sense to replace portions of the lines. I'd have to add in some regardless, why not replace and forget about it?
Sorry for the long post, I tried to depict the scenario as best I can.