Johns Manville R- 30 Attic Unfaced Fiberglass Roll Insulation 31.25-sq ft (15-in W x 25-ft L) Individual PackJohns Manville unfaced batts and rolls effectively control heat flow to the outside and unwanted noise inside. For use in wood framed attics and ceilings Rolls are designed for long, unobstructed spaces with 16 in on center stud spacing Unfaced without a vapor retarder can be added to existing insulation Improves energy efficiency and provides sound control JM is a partner of the Seal and Insulate with ENERGY STAR program SCS Recycled Content