I'm looking for the appropriate material for insulating the AC/HEAT ductwork in the attic. Right now it is wrapped with 3" of kraft backed fiberglass and it is very 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 @ R3. Looking for ideas. We are in the desert, so there is very little concern for condensation. My guess is re-wrapping the existing insul may be most economical. Maybe there is a product specific for this application. ANY IDEAS? I'm not looking forward to this! Thaqnks

it loose ,but is it breaking apart? When you compacted a loose insulation its R value would be less , assumed you have the flex duct. When it is hard metal you could remove the existing insulation, "try " to seal up all the seams and rewrap it better, it normally have R6 value