How long do pipes really last under pressure?

Funny you mention the PEX near heat sources - ran into that exact thing behind a water heater last year. The pipe itself was fine, but the fittings were starting to look a little cooked, almost chalky. I’ve always wondered if it’s more about the install than the brand, though. Like, maybe some folks don’t use enough insulation or just run it too close to the heat? Ever tried swapping out just the connectors instead of the whole run? Curious if that actually buys you more time or just delays the inevitable...

Had a similar situation in a flip a couple years back - PEX right behind a furnace, and the fittings were basically turning to dust. The pipe itself was still flexible, but those connectors looked like they’d been left out in the sun for a decade. I agree, it feels like install is half the battle. Some folks just don’t give enough space or slap on the cheapest insulation they can find.

Swapping just the connectors? I’ve done it when I was in a pinch and didn’t want to rip out a whole section. Sometimes it buys you another year or two, but honestly, if the fittings are cooked, I always worry the rest of the line is getting there too... Kind of like changing one tire on a car with four bald ones. It’ll get you home, but you know it’s temporary.

If you’ve got access and time, I’d say re-run that stretch with better clearance and maybe spring for the beefier insulation. Otherwise, keep a close eye on it - PEX hides problems until you’re staring at a puddle where your drywall used to be.

Yeah, I’ve seen that too - sometimes it’s like the fittings just give up way before the pipe does. I always cringe when I see pipes crammed in tight corners with barely any insulation. Honestly, it’s wild how much a little extra clearance and better wrap can help. I get wanting to save time or money, but water damage is such a pain to fix... I’d rather overdo it on protection than risk a surprise leak behind my new paint job.

I’ve run into that exact scenario during a kitchen remodel - pipes wedged so tight against the wall, barely any room for insulation, and the fittings were already showing signs of stress. It’s tempting to cut corners, but I’ve learned the hard way that a little extra effort up front saves a ton of hassle later. I started using recycled denim insulation around pipes, and it’s made a noticeable difference. Not only does it help with temperature swings, but it’s also way better for the environment than foam. Sometimes the “overkill” approach is just smart planning.

Funny you mention the recycled denim - my neighbor swears by that stuff too. I’ve always been a bit paranoid about pipes under pressure, especially after dealing with a pinhole leak in copper that was only 12 years old. Turns out, the real killer was the lack of insulation and a weird bend that stressed the joint. I used to think “overkill” was just for perfectionists, but after patching drywall twice, I’m all for it. Pipes might be rated for decades, but it’s those little details that seem to cut their life short.