How long do pipes really last under pressure?

I’m right there with you - if I’m tearing into a wall, I’m not trusting any of those old joints to behave. I’ve seen “good” copper turn into a pinhole sprinkler overnight thanks to lousy water or some hack job from the ‘80s. Sometimes it feels like you’re just buying time, not peace of mind... but at least you know what you’re dealing with.

I swear, every time I open up a wall, I half expect to find a copper pipe held together with chewing gum and hope. I get what you mean about just buying time - my house is a patchwork of “temporary” fixes from previous owners. But here’s what I keep wondering: is it actually worth replacing everything with PEX, or am I just trading one set of problems for another down the line? I hear some folks swear by it, but then you get those horror stories about rodents chewing through it...

my house is a patchwork of “temporary” fixes from previous owners

Man, I feel this in my soul. Every time I pull up a floorboard or look behind drywall, it’s like a history lesson in bad decisions. About PEX - honestly, I went back and forth for months. Copper’s solid, yeah, but unless you’re ready to drop serious cash and deal with all the soldering (and possible corrosion if your water’s rough), it’s just not realistic for most of us.

PEX has its drawbacks, no denying that. The rodent thing freaked me out too, but after talking to a few plumbers and reading way too many horror stories online, it seems like it’s only an issue if you’ve already got a rodent problem. Otherwise, it’s flexible, cheaper, and faster to install. If you’re replacing sketchy old pipes anyway, I’d say go for it - just make sure you don’t skimp on the fittings or leave any gaps critters can get into.

You’re not trading one disaster for another as long as you do it right the first time. At least that’s how I convinced myself when I tore out all the galvanized in my kitchen... fingers crossed I don’t regret it in ten years.

I get the appeal of PEX, but I’m still a little wary about its long-term durability, especially if you’re in a spot with a lot of sun exposure or weird water chemistry. I’ve seen some older PEX runs get brittle or discolored after a decade or so - maybe it’s just bad batches, but it makes me nervous. Copper’s a pain, yeah, but at least you know what you’re getting. I guess it comes down to how much you trust the install and your local conditions... I’m still on the fence for my own place.

I hear you on PEX - I've had a few rental rehabs where I thought, "Hey, this stuff is a breeze to install, why not?" Fast forward a few years, and I’m replacing a section that got weirdly chalky and brittle... turns out the attic heat cooked it. That said, I’ve also had copper pinhole itself into a sprinkler in one of my units thanks to the local water eating it alive. Nothing like a surprise indoor fountain to make you rethink your choices.

Honestly, I think every material has its Achilles’ heel. PEX hates UV and certain chemicals, copper gets eaten by aggressive water, and don’t even get me started on old galvanized. At this point, I just try to match the pipe to the house and the neighborhood - sometimes you gotta pick your poison and hope for the best. If you’re losing sleep over it, maybe just budget for a future re-pipe and call it a day...

Honestly, I think every material has its Achilles’ heel. PEX hates UV and certain chemicals, copper gets eaten by aggressive water, and don’t even get me started on old galvanized.

You nailed it - every pipe’s got its drama. But I’ll throw in a curveball: have you ever looked at recycled HDPE or even stainless for certain runs? I know, sounds like overkill for a rental, but in some eco-reno circles, we’re seeing folks use HDPE (think big blue coils) for buried lines or even radiant heat. It’s tough stuff and doesn’t care about UV if it’s buried or inside walls.

Here’s my step-by-step for picking the “least-worst” option:
1. Check your water chemistry. If it’s eating copper, maybe skip the shiny stuff.
2. Look at where the pipe’s going - attic? Crawlspace? Sun exposure? PEX in the attic is basically a slow-cook recipe.
3. Think about future access. If you’ll need to get at it again, maybe don’t bury it behind three layers of drywall.
4. If you’re feeling wild, price out alternatives - sometimes stainless isn’t as wild as you’d think for short runs.

I still lose sleep over plumbing sometimes, but at least now I can say I tried everything short of running bamboo tubes...

I’ve been down the rabbit hole on this too. When we opened up a wall in our 1960s place, I found copper that looked pristine in some spots and then, just inches away, pinholes everywhere. Water chemistry really is the wildcard. I actually considered HDPE after reading about it here - those big blue coils you mentioned - but ended up going with PEX for flexibility. Still, I keep thinking about your point:

If you’ll need to get at it again, maybe don’t bury it behind three layers of drywall.

Man, I totally get the regret about access. When I did my kitchen reno, I thought I was being clever hiding everything behind a fancy tile backsplash. Fast forward two years - small leak, had to rip half of it out. Never again. It’s wild how copper can look perfect one spot and be Swiss cheese the next. PEX has been good to me so far, but I still get nervous about what’s lurking behind the walls. Sometimes I wonder if future-proofing is even possible in these old houses...

Title: How Long Do Pipes Really Last Under Pressure?

Sometimes I wonder if future-proofing is even possible in these old houses...

That hits home. I once bought a duplex from the 40s, thinking I’d just update the kitchens and bathrooms, rent it out, and call it a day. First winter, the tenant calls - water coming through the ceiling. Turned out a “perfectly fine” copper line had burst right above a joist. The plumber said it was probably pinholed for years, just waiting for the right moment to let go. It’s wild how you can stare at a run of pipe and have no idea what’s happening an inch further down.

I get the temptation to hide everything behind pretty finishes. But after that mess, I’ve become borderline obsessed with access panels and removable backsplashes. Doesn’t matter how clever it looks - if you can’t get to it, you’re rolling the dice.

PEX has been a game changer for me too, but I still get nervous about what we’ll think of it in 30 years. Like, will people be cursing us for using plastic instead of copper? Or will they thank us because it didn’t corrode? Sometimes I wonder if every generation just deals with their own version of “what were they thinking?”

Curious if anyone’s actually seen those old galvanized pipes last longer than expected? Or maybe found some weird material in the walls that somehow held up better than copper or PEX? Feels like every house has its own story when it comes to what’s lurking behind the drywall...

Galvanized pipes are kind of like the cockroaches of plumbing - sometimes they just refuse to die, even when you’re sure they should’ve failed decades ago. I demoed a kitchen in a 1920s bungalow once and found iron pipe that looked like it belonged in a museum, but it was still holding water (though barely). Meanwhile, my neighbor’s “newer” copper lines sprang leaks out of nowhere. It’s wild how inconsistent it all is. I’m with you on the PEX paranoia too... feels weird trusting plastic with something so critical, but I guess time will tell. Access panels are my new religion after patching drywall for the third time - can’t recommend them enough.

Access panels are my new religion after patching drywall for the third time - can’t recommend them enough.

I get the love for access panels, but honestly, I’ve found that a little planning on pipe runs can save a ton of headaches later. If you’re doing a remodel, mapping out where shutoffs and unions go makes future repairs way less invasive. As for PEX, I was skeptical too, but after seeing it hold up in some rough crawlspaces (and with fewer pinhole leaks than copper), I’m starting to trust it more. Just gotta use quality fittings and avoid sunlight exposure... that’s where things can go sideways.

Mapping pipe runs is underrated, for real. I learned that after chasing a leak behind a cabinet - never again. For my first reno, I sketched out every shutoff and union on graph paper. It took ages, but saved me when a fitting came loose later. PEX still feels weirdly plasticky to me, but it’s been solid so far. Just wish the UV thing wasn’t an issue... makes outdoor runs kind of nerve-wracking.

I totally get the PEX thing - feels almost too light compared to copper, right? When I did my first bathroom, I kept wondering if it could really handle pressure long-term. From what I read, PEX is supposed to last 40-50 years under normal home pressure, but the UV issue outside makes me nervous too. I used foam sleeves for the one short exterior run, just in case. Mapping out every shutoff was a pain but honestly, it saved me when I had a slow drip behind the vanity. If you’re worried about longevity, maybe stick to copper for any spots that get sun? That’s what my neighbor swears by, though it’s not cheap...

Mapping out every shutoff was a pain but honestly, it saved me when I had a slow drip behind the vanity.

That’s exactly the kind of “future me will thank present me” moment I wish happened more often. I’ve lost count of how many times I’ve had to crawl under a sink and play plumbing detective because I didn’t label something.

The UV thing with PEX is wild - like, who knew sunlight could be a pipe’s arch-nemesis? I get the copper loyalty, but my wallet definitely doesn’t. Have you ever seen those colored PEX pipes used as a design feature? I saw someone run them exposed in a laundry room and honestly, it looked kind of cool… but then again, maybe not the best idea if you’re worried about sun.

Curious - has anyone here actually had PEX fail from UV, or is it mostly just a “heard it from a neighbor’s cousin” kind of thing?

I’ve never actually seen PEX melt in the sun, but I did have a buddy whose garage plumbing turned a weird yellow after a couple summers. Didn’t leak, but it looked like old Tupperware. Anyone else just wrap exposed pipes in whatever’s handy, or is that just me being cheap?

I totally get the urge to just grab whatever’s lying around and wrap it around exposed pipes - especially when you’re staring at a price tag for “official” insulation sleeves. I did that exact thing last winter, using some leftover yoga mat bits and duct tape. It looked kind of ridiculous, but honestly, it seemed to work fine. Still, I keep wondering if I'm just making more work for my future self by half-assing it now.

That yellowing you mentioned is weird, though. I’ve read that PEX can degrade under UV, but it’s not supposed to just fall apart overnight or anything. Makes me wonder if the color change is just cosmetic, or if there’s a real risk of the pipe getting brittle or weak over time. Has anyone actually seen a pipe fail from being in the sun too long, or is this more of a “cover your butt” thing manufacturers say? I see old copper pipes all the time that look way worse but still hold up.

The other thing I keep thinking about - if you wrap pipes in random stuff, especially if it’s not meant for plumbing, does it trap moisture and make things worse? Like, could I be setting myself up for mold or rust just because I didn’t want to run to the hardware store? There’s always that voice in my head saying “do it right or do it twice,” but then again, who wants to spend $50 on foam sleeves for pipes that might never leak?

Curious if anyone's actually had a pipe burst or spring a leak from sunlight exposure alone. Or is this one of those things people worry about way more than they need to?

I’ve definitely wrapped pipes in whatever I had on hand - old towels, bubble wrap, you name it. It’s tempting, but yeah, moisture can get trapped if the material isn’t breathable. I once pulled off a DIY wrap and found some gnarly mildew underneath. If you’re using something like a yoga mat, maybe leave a little gap at the bottom for air flow? As for UV damage, I’ve never seen a PEX pipe fail just from sunlight, but I have seen them get brittle after years in direct sun. Usually takes a while though. Copper’s tougher, but even that can corrode if it stays wet. Sometimes spending a bit more up front saves headaches later... but I still cut corners when I can’t justify the cost.

I get wanting to save a few bucks, but honestly, I wouldn’t trust stuff like towels or bubble wrap for long-term pipe protection. Tried that once in my old place - ended up with a soggy mess and some rust spots on the copper. If you’re worried about UV or moisture, those foam pipe sleeves from the hardware store aren’t that pricey and they’re made for this. I get the urge to improvise, but sometimes the cheap fix just means more work down the line.

Honestly, I’ve tried the towel trick too - total rookie move on my first flip. Looked fine for a couple weeks, then I checked under the sink and it was all damp and gross. Ended up replacing a section of pipe that started to pit. Those foam sleeves are way easier and save you headaches later. Sometimes spending a few bucks up front is just worth it, you know?

- Totally get where you’re coming from - those quick fixes seem clever until you’re dealing with soggy cabinets.
- I’ve seen so many folks try to save a few bucks and end up with way bigger headaches.
- Foam sleeves are such a small investment for peace of mind and they look way cleaner, too.
- Honestly, sometimes the “cheap” route just isn’t worth the stress or the mess... learned that one the hard way myself.