That’s a smart move with the denim—honestly, foam sleeves are a pain for anything that isn’t a straight run. I get your concern about critters, though. In my experience, mice will chew through just about anything if they’re determined enough, but the vapor barrier sleeve should help discourage them a bit. I’ve seen more issues with fiberglass than cotton, weirdly enough. Maybe it’s the texture? Either way, your method sounds way less wasteful and probably easier to work with when you hit those awkward bends.
I’ve had similar issues with fiberglass—mice seem to love nesting in it, and it’s a pain to clean up after. Cotton’s a bit better, but I still worry about moisture retention and mold, especially in older basements. The denim approach is interesting, though I’d double-check local code requirements since some inspectors get picky about fire ratings and vapor barriers.
One thing I always stress is sealing up any gaps around the pipes before insulating. Expanding foam or steel wool can help keep critters out, and it’s worth the extra step for peace of mind. I’ve seen folks skip that and end up with a mess behind the walls later on.
For awkward bends, I usually cut the insulation to fit snugly and tape the seams well—less chance for cold spots or pests to sneak in. It’s not glamorous work, but it saves headaches down the line.
You’re spot on about the mice—fiberglass might as well be a five-star hotel for them. I’ve had to pull out whole sections because someone skipped sealing around a pipe chase. It’s not fun. Your point about checking code for denim is solid, too. Some inspectors are sticklers for anything that’s not standard batt.
Cutting and taping insulation at bends really does make a difference, even if it’s tedious. I always tell folks it’s the stuff no one sees that saves you headaches later. Nice to see someone else who doesn’t cut corners—makes all the difference.
Not sure I totally agree about denim always being a code headache. Around here, I’ve had inspectors pass it without a second glance, especially if it’s installed clean and labeled right. Maybe it depends on the county? Also, I’ve started using spray foam in tight spots instead of taping batt insulation at bends—less fiddly, seals better, and mice seem to hate the stuff. Just gotta watch for over-expansion or you’ll have a mess.
Yeah, I’ve noticed the same thing with inspectors—sometimes they barely glance at the insulation if it’s tidy and labeled. County definitely makes a difference. I like your spray foam trick for tight spots. I’ve had to scrape off a big blob or two when I got carried away, but it does seal up those weird bends way better than tape. Mice chewing through batt is the worst... spray foam seems to slow them down, at least.