Is 24 inch insulation really 24 inches wide?
Bill writes from Ann Arbor, Michigan: “Is Owens insulation that is specified at 24″ wide really 24″ edge to edge? Will it overlap beams (in an attic) that are 24″ apart (center to center) where the actual space between them is 19.5″?” Answer: Owens Corning Fiberglas™ insulation specified at 24 inches is true. If the cavity is 19.5 inches, the product will be too wide.