How much insulation should there be? The attic floor uses 2x6s. Should the insulation be no more than 6" high or can it rise up over the 2x6s? Keep in mind that I'm planning to cover the attic floor with plywood to use it for storage. I've heard that it's bad to compress insulation so should I put no more than 6" in since I know I'll be laying plywood over it?
Should I get faced or non-faced? Kraft or foil faced? The current insulation has a kraft face facing down (against the 2nd floor ceiling). Should I add non-faced or remove what's there and add brand new?
Any help would be appreciated. Thanks.