Have checked Lowe's and Home Depot but they only carry some stuff that looks like shredded paper. Is this what I should use or is there a better product?
Also I am confused about the R requirements: It's R38 in my area (SE Texas) with gas or other fuel heat, but the tables at the shop say has to be R49 if you have an electric furnace. I have electric HVAC but can't understand why the R value should be different.
Thank you for your help