I get where you’re coming from about labels not lasting—tape’s a pain, and even marker fades if it gets damp. That said, I’ve found zip ties aren’t always the magic bullet either, especially if you’ve got a tight crawlspace or a bunch of lines running together. Color coding helps, but what happens when you’ve got more than just hot and cold? I’ve got some units with recirc lines, irrigation, even a loop for the boiler. At a certain point, it’s just a rainbow of plastic.
If you’re already in the crawlspace, might as well insulate those pipes too. Cuts down on heat loss and saves headaches when winter hits.
Insulation’s a must, no argument there. But I’m curious—has anyone had issues with critters chewing through foam wrap? I’ve had to double back and redo sections after mice made themselves at home last winter. Sometimes I wonder if rigid insulation or even pipe heat tape is the better long-term bet, especially if you’re not planning to crawl down there again anytime soon...
Insulation’s a must, no argument there. But I’m curious—has anyone had issues with critters chewing through foam wrap?
Had the same battle with mice last winter—found a whole bunch of chewed-up foam and even some nesting right in the insulation. Tried switching to that rigid fiberglass wrap with the foil backing, and they seem to hate it (or at least they move on to softer digs). Heat tape’s great, but if you’ve got a lot of lines, it gets pricey fast. On labels, I once tried those little metal tags with a punch set… not pretty, but they’re still hanging on after years of damp.
Foil-backed fiberglass definitely seems tougher, but I’ve actually had mixed luck with it. Mice didn’t chew through, but they still managed to nest behind it—guess they’re more persistent than I gave them credit for. What’s worked better for me is using wool insulation (the stuff made from sheep’s wool). It’s pricier up front, but it’s naturally resistant to critters and doesn’t off-gas like some foams or fiberglass. Plus, it holds up well in damp spots.
Heat tape is handy, but I always worry about the energy draw over a long winter. Instead, I started focusing on sealing up entry points around the pipes—steel wool and caulk in every little gap. Not perfect, but it cut down on the mouse traffic a lot. Labels-wise, I just use a Sharpie on duct tape... not fancy, but at least I can read it when I’m crawling around under the house.
Wool insulation is a solid choice—I've noticed it does a better job with moisture, too. In older rentals, though, I’ve had trouble convincing tenants to leave it alone; some folks think it’s weird stuff. On the heat tape front, I get your concern about the electric bill. I’ve found programmable timers help a bit, so the tape only runs during the coldest hours. As for labels, I’m right there with you—nothing beats duct tape and a marker when you’re in a crawlspace. Fancy tags just get ripped off or covered in dust anyway.
Timers on heat tape are a good move, but I’ve actually had mixed results with them in some of the older places I’ve worked on. Sometimes those pipes are so exposed or drafty that even a couple hours without heat tape running can be enough for a freeze-up, especially during those weird cold snaps we get. I get wanting to save on the electric bill—nobody likes a surprise in January—but if the insulation isn’t perfect, it can be risky.
About wool insulation, I know what you mean about tenants messing with it.
—I’ve seen that too. Honestly, I’ve started using foam pipe wrap in spots where people are likely to poke around. It’s not as good with moisture, but it’s cheap and easy to replace if someone rips it off or it gets gross. For crawlspaces that stay damp, I’ll sometimes double up: foam on the outside, wool underneath. Not pretty, but it keeps everyone happy and the pipes dry.“some folks think it’s weird stuff”
On labeling, duct tape and marker is classic, but I’ve had issues when the tape gets wet or cold and peels off. If I know I’ll be back under there next season, I’ll sometimes just scratch a mark right into the pipe insulation with a screwdriver—crude, but it sticks around longer than most tapes.
One thing I’d add for winter: check that any vents near pipes are actually closed up tight. Drafts undo all the insulation work fast. And if you’re dealing with tenants who like to “tidy up,” maybe leave a note or two explaining why things look the way they do. Sometimes just knowing it’s supposed to be there keeps folks from pulling stuff off.
Anyway, just my two cents from crawling around under houses too much...