I had denim insulation in my basement a few years back—thought I was doing the planet a favor, but ended up with a moldy mess. Switched to wool and haven't looked back. Good call on checking pipe clamps too, those little details make all the difference.
Interesting you mention denim insulation—I almost went that route myself when insulating my attic last year. Did a ton of research, and while the eco-friendly angle was appealing, I kept running into stories similar to yours about moisture issues and mold growth. Ended up going with cellulose instead, which has been decent so far, though I'm still skeptical about its long-term performance.
As for pipe clamps, totally agree that small details can be surprisingly impactful. When I first moved into my place, I had this persistent knocking sound whenever the heat kicked on. Drove me nuts for weeks until I finally traced it to a loose clamp near the boiler. Tightened it up, and the difference was immediate. It's funny how something so minor can cause such a headache... Glad you got yours sorted out.
"It's funny how something so minor can cause such a headache..."
Yeah, it's always the little stuff that gets overlooked. Had a similar issue last winter—turned out to be a pipe rubbing against a joist. Took ages to pinpoint, but man, silence never sounded so good... Glad you're sorted now!
Good job tracking it down—these minor issues can drive you nuts until they're fixed. Had a tenant once convinced the building was haunted... turned out to be air trapped in the pipes. Glad your headache's finally gone.
Nice job sorting it out, but honestly, sometimes chasing down every little noise can be a rabbit hole. Had a similar issue myself—spent hours trying to silence a knocking sound, only to realize it was just the pipes expanding when the heat kicked on. Eventually, I just learned to live with it. Not saying you shouldn't fix stuff, but sometimes it's easier (and cheaper) to accept a little quirkiness around the house...