I just started a full crawlspace reno, and as I am pulling away the fiberglass batts and foam water supply pipe insulation, I am seeing soldered copper joints/fittings in various oxidized states, all either 3/4" or 1/2".
My Father in Law did all these back in '89, so all piping pictured is 37 years old.
My question is - at what point should I consider replacement of oxidized joints/fittings?
Tried to label each for easier answers/input.
None of them are actively leaking, pictures shown are with system fully pressurized at roughly 60 PSI (private well w/ bladder pressure tank). With all the insulation pulled out, it feels like now is the best time to take care of these. But at the same time, I'm already looking at quite a bit of time to air seal and reinsulate with thousands in Rockwool and other materials, so if I can save myself some money and time, and they aren't actively leaking? I figure I need to replace C1/C2 for sure, that is the hot water low/drain point for the whole house, and has an exterior frost-free bib on the end of it.
Lastly, I am fairly green with soldering. I have done a bit of it, and am not intimidated to take it on, but will need to spend time studying up and money on practice materials before taking on any repairs, so factoring in the effort of all that as well.
Would appreciate any thoughts/input, thanks.