Johns Manville Formaldehyde-free kraft-faced fiberglass batts are for use in 2' x 6' exterior sidewalls, basement walls, garage walls, floors and ceilings/attics. Kraft facing serves as a vapor barrier to help manage moisture and includes tabs for easy stapling to wood framing. This product helps save energy and provides good sound absorption. Glass fiber will not settle rot, mildew or deteriorate. Convenient pre-cut batts mean less cutting. This product has been GREENGUARD® certified for superior indoor air quality.