I am certainly not the expert here by any means, but I know when I got insulation to put the door back together on the 56 that we have, I got the lowest rating insulation I could get at Home Depot, which I think was R22, but either way, it was too think once decompressed. I had to actually thin it out some so it didn't apply too much pressure against the door liner. I got it to work though. The insulation I got also had the single side paper, so guessing it was NOT the "unfaced" type mentioned on here. I did all this prior to finding this website, otherwise, I would have probably been able to find the right stuff.