I used R-13 the last time I repacked mine :) Worked just fine, just get the stuff w/o the vapor barrior. As for the suff you have, flatten it out as much as possable and cut to fit the width of your packing screen. Then just wrap, not too tight for it will act as a baffle if too tight. Just a couple of wraps and install.
Good Luck!
Phillip
End Note: The R-13 works fine, I got mine in a roll from Home Deepsquat for like 5 bucks and enough material to repack about 5-6 times. :thumb: