I hadn't worked with denim insulation before, but I'm always interested in greener options. After using up the rest of the traditional R-19 roll I had, I got some UltraTouch. It's made from recycled denim (post-industrial waste) and so has a lovely blue color.
The first thing I discovered is its hecka dusty. Most batt insulation gives off some dust (plus it's all very good at absorbing dust wherever it is.) Usually it's not-good-for-you fiberglass fibers it's giving off. But when I was stuffing the denim batts between the floor joists, I observed a veritable storm of dust coming down. After putting up a couple of batts, there was a visible blue layer on top of the washing machine.
The second thing I discovered is that its hard to cut the usual way (i.e., with a utility knife or a pair of scissors). The UltraTouch website suggests a $30 Cepco insulation knife, a Bosch Foam Rubber Cutter, a hand held grinding tool, or a table saw. Huh? OK, they all make some sense, but I'm
Despite the dust and the increased difficulty cutting it, my vote so far is a big thumbs up. The blue dust is much preferable to fiberglass fibers, and the cost was comparable to traditional batts.
Have any of you worked with denim insulation? What's your experience been?