Johns Manville Formaldehyde-free insulation is made with proven fiberglass technology and consists of recycled and renewable content including a new organic plant-based binder that has no formaldehyde, acrylics, or dyes added. It offers the greatest thermal performance and can be used in new or existing attic floor/ceiling applications. Use of a separate vapor barrier may be required. Convenient pre-cut batts mean less cutting. This product helps save energy. It offers good sound absorption and inorganic glass fiber will not rot, mildew or deteriorate. GREENGUARD® certified for superior indoor air quality.