
I just used the standard Lowes insulation grade UltraTouch (R-13). I don't think they carried the UltraTouch+ nor panels. According to specs the UltraTouch+ has a 20% greater density than the standard insulation. The additional 20% would no doubt be mechanically more effective but I suspect my ears wouldn't know. If UltraTouch+ is readily available, then I'd use it. The density ratings don't seem to have consistent relationships to the measured results.. nothing radical anyways.. At the end of the day, I used what was immediately available and it worked really well.
PRODUCT THICKNESS DENSITY MOUNTING 125HZ 250HZ 500HZ 1000HZ 2000HZ 4000HZ NRC
R-13 3.5" (mm) A 0.95 1.30 1.19 1.08 1.02 1.00 1.15

Hope you get many hours of enjoyment out of your set up.




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