why is documenting plumbing connections such a nightmare?

Yeah, QR codes are a decent workaround, but I still end up with half a dozen random laminated squares taped everywhere and forget which one goes to what. At least they don’t get soggy like paper, though. I started using a label maker for the pipes themselves - just slap a label right on the valve. Not high-tech, but when you’re in a crawlspace at 2am, sometimes old school wins. Still haven’t found a “perfect” solution... if that even exists.

Honestly, I’ve found color coding to be more useful than QR codes or labels, especially in low light or tight spaces. A strip of colored electrical tape on each line - red for hot, blue for cold, green for drain, etc. - saves me the headache of squinting at tiny writing or hunting for my phone. Not high-tech, but it’s hard to mix up neon orange and bright blue. It’s not perfect, but it’s a lot harder to mess up at 2am when you’re half-asleep and covered in dust.

I get where you’re coming from with the colored tape - it’s definitely quick and you can spot it from across a crawlspace. But I’ve run into issues when the tape peels off, gets covered in grime, or just fades after a couple years. Had a tenant call me once because they thought the “blue” was black from dust and almost shut off the wrong valve.

Honestly, I still prefer old-school engraved tags or even those laminated labels you zip-tie on. Yeah, they’re a pain to make, but they last forever and don’t depend on color vision (which, not for nothing, can be an issue for some folks). QR codes are a bit much for me - half the time I don’t have my phone handy or my hands are filthy anyway. But a solid, physical tag? Hard to beat for long-term rentals where you don’t want to redo the system every couple years.

Color tape is great for a quick fix or if you’re the only one using it, but for multiple units and different people, I’d rather over-document than risk a mix-up.

- I totally get the frustration with tape. I tried using it in my basement and after a year, half of it was just sticky gunk or faded out.
- Engraved tags seem like overkill for a single house, but I do like the idea of something that won’t just fall off or get gross.
- I’m always worried about someone (or me, honestly) shutting off the wrong thing in an emergency.
- Has anyone tried those metal keychain-style tags? Wondering if they hold up better than plastic ones under the pipes where it’s damp all the time...

Metal keychain tags are actually my go-to for rentals. The cheap plastic ones crack or get all grimy, especially near the water heater. Metal holds up way better - just make sure you use a zip tie or stainless wire instead of the ball chain, those rust out fast in damp spots. Engraved tags might seem fancy, but after a tenant shut off the main instead of just the hose bib, I stopped caring about “overkill.” Better safe than sorry when water’s pouring everywhere...