Owens Corning R-13 Unfaced Fiberglass Insulation Batts 3.5 in. x 15 in. x 105 in. (5 Bags)Owens Corning R 13 Unfaced Fiberglass Insulation Batts The Owens Corning R 13 Unfaced Fiberglass Insulation Batts offer superior performance for maintaining energy efficiency and comfort in your building. Designed to fit seamlessly into 2x4 interior and exterior walls, floors, and ceilings, these batts are easy to install and can be cut to size with a utility knife for custom fitting. The unfaced design allows for flexibility in vapor barrier