I am about to insulate my steam pipes, which are currently exposed. I have a ton of extra attic insulation left over from another project. Can I use this (and some duct tape for shaping) on my steam pipes? Or is there a compelling reason to purchase fiberglass that is specifically designed for pipes?
I suppose it depends on your tolerance for misery, as much as anything. Trying to wrap pipes in attic batts and tape them in place sounds like a perfectly miserable time to me.
Slow, awkward, getting covered in glass fibers (gear up throughly) and the end result being a general mess.
Other than that, yes it's insulation, and it should stand steam temperatures. Convenience, time savings and a neater result are the reasons to choose pre-formed pipe insulation. If you are good with abandoning those, forge ahead.