Ed writes from Greensburg, Pennsylvania: "I need to put a floor in my attic for storage space. I have put 6 1/4 fiberglass insulation in my attic (w/vapor barrier). Should I put furring strips above the joist to allow the air to circulate under the plywood?

Also would I increase the energy efficiency by adding additional insulation around the perimeter of the plywood floor (the outer 4' perimeter of the attic)?"

Answer: There is no need for furring strips or an air space below the new attic floor. I would also add insulation around the perimeter of the attic floor. In most climates the U.S. Department of Energy recommends a total of 12 to 16 inches of fiberglass insulation.