Just for fun, I was reading this site deciding if I should replace all my old mouse-poop-filled blown pink insulation in my attic. [Can Rebate, Ont Rebate]
I have no room to add to the insulation in my attic, so I'll likely need to throw it all out or risk ice built up from lack of soffit venting.
6 inches of blown fiberglass: R-13.2
6 inches of fiberglass batts: R-18.84
16 inches of blown fiberglass: R-35.2
16 inches of fiberglass batts: R-50.24
Hollow Core Wood Door (1 + 3/4 inch): R-2.17
Metal Insulating Door (2 inch): R-15