Raising Attic Floor for More Insulation
My attic is currently floored with 1" boards. When I bought the house two years ago, there was R-19 fiberglass batts stapled between the rafters. Since the attic is also vented, I realized it wasn't doing much good, so I took the insulation down and layed it on the floor.
My heating/cooling costs are still through the roof, so I am planning to increase the insulation in my attic. I am in Cleveland where code is R-38, so I would like to double it at the least. My attic is also very easy to access for storage purposes, so I would like to keep at least a portion of the attic floored.
My plan is to pull up the current flooring and run 2X8's perpendicular to the floor joists, nailing them in to the rafters. That would give me a total cavity of 14" to reuse my exsisting fiberglass batts and blow in cellulose to top it off. On top of the new 2X8's, I'll screw in a new plywood floor.
Does anyone see an issue with this? I've done some searching online and haven't seen a case of anyone doing this. It seems safe, but my fear is that I can do damage to the structure.