I'm looking for the appropriate material for insulating the AC/HEAT ductwork in the attic. right now it is wrapped with 6" of squashed kraft backed fiberglass and it is loosely fitted. It is going to be a big job to remove it as there is quite a lot of it and it is so dusty with cellulose, etc. I was considering just wrapping the existing insulation with some sort of plastic wrap to tighten up the fit and seal it better. Maybe it would be better to remove it and use another product. Haven't found much in my searches that is designed for the project except some expensive sticky back material that is 1/4 in @<hidden> R3. Looking for ideas. We are in the desert, so there is very little concern for condensation. My guess is wrapping the existing insul with a plastic wrap may be most economical and best suited for the job. Maybe there is a product specific for this application. ANY IDEAS? I'm not looking forward to this! thanks