[Flatbutt1]

Originally Posted by G50

Our water quality is very good, not too hard, no high iron etc (thus my 60 year old copper still looks good). Also, we have just installed a whole house water filtration system, so it’s even better now.

Pex lasting 25 years, I don’t think anyone really knows, right? It hasn’t been in widespread use (or any use?) for that long, so it seems like no one really knows how long it will last.

I am a little concerned about the quality of new copper. I’m guessing that, like most things, “they don’t make it like they used to.” But 60 years old feels like that’s getting up there.

Some of the areas can be reached fairly easily by cutting drywall, others are more difficult, they will be behind shower walls etc.

I think Pex is out. So it’s between leaving the old or replacing with new copper.

If you know how to sweat a joint then that's the less expensive method of joinery. The compression fittings are way easy but pricey. IMHO