Honestly, I get the urge to overbuild—nobody wants a burst fitting in the middle of winter. But I’ve seen plenty of brass and copper setups leak too, especially if the joints aren’t prepped right or the pipe gets stressed from freezing and thawing. Sometimes it’s less about the material and more about how you insulate and support the lines. I’ve had decent luck with reinforced PEX and good insulation, even in some nasty cold snaps. Maybe it’s not as “bombproof” as all-brass, but it’s a lot easier to work with if you need to swap something out mid-season. Just my two cents...
I hear you on the insulation—sometimes it feels like no matter what material you use, if the lines aren’t protected, you’re just asking for trouble. I’ve actually had more issues with poorly supported copper than with PEX, especially in spots where the pipe could shift a bit. PEX does seem to handle those freeze-thaw cycles better, at least in my setup. Still, I do wonder if there’s a “best” way to combine materials for both durability and ease of repair... maybe a hybrid approach?
I totally get where you’re coming from. When I moved in, I thought copper was the gold standard—my dad swore by it—but after a couple winters, I started noticing weird creaks and even a tiny leak where the pipe wasn’t anchored well. PEX seemed kind of “cheap” to me at first, but honestly, it’s been way less hassle with all the temperature swings we get here.
I’ve wondered about mixing them too. Like, maybe copper for the main lines where they’re tucked away and less likely to move, then PEX for the runs that go through crawl spaces or places that are harder to keep warm? Not sure if that’s overkill or just smart planning.
Anyway, it’s reassuring to hear someone else has had similar issues. Sometimes it feels like you’re just guessing and hoping for the best... but maybe that’s just part of figuring out homeownership.
Mixing copper and PEX isn’t overkill at all, in my opinion—it’s just adapting to what works best in each part of the house. I had the same hesitation about PEX looking “cheap,” but after seeing how it handles freezing temps and expansion, I’ve come around to it too. Copper is great where it’s protected and stable, but anywhere you’ve got shifting temperatures or spots that are tough to insulate, PEX just seems more forgiving.
Honestly, I think most of us are piecing things together as we go. There’s no perfect answer, especially with older homes or unpredictable weather. I tried to stick with copper everywhere at first (figured if it lasted 50 years before, why not again?), but after chasing a couple pinhole leaks in the crawlspace, I swapped those runs for PEX. Zero regrets.
It’s kind of funny—my dad still gives me a hard time about “plastic pipes,” but I’ll take fewer headaches over tradition any day. Sometimes smart planning just means learning from what hasn’t worked!
Mixing copper and PEX is pretty much the story of every retrofit I’ve seen lately. I get the old-school loyalty to copper—my uncle still swears by it and calls PEX “garden hose plumbing”—but after seeing how PEX holds up in crawlspaces and attics, I’m not convinced copper’s always worth the hassle. Those pinhole leaks you mentioned are a nightmare, especially when you’re crawling around in insulation dust.
I do wonder sometimes about long-term durability with PEX, especially if it’s exposed to sunlight. The UV thing makes me a little nervous, but as long as it’s tucked away or sleeved, it seems fine. I’ve seen a few solar water heater setups where folks ran PEX outside and didn’t realize it was getting cooked by the sun—ended up with brittle lines after a couple summers. Maybe that’s just bad planning, but it’s something to watch for if you’re thinking about solar kits.
Honestly, I’d rather swap out a section of PEX than try to solder copper upside-down in a crawlspace again. If it works and saves you a headache, I say go for it... even if the old-timers roll their eyes.