Johns Manville Formaldehyde-free insulation is made of 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. These Un-faced fiberglass batts are for use in 2′ x 6′ exterior sidewalls, basement walls, garage walls, floors and ceilings/attics. Use of a separate vapor barrier may be required. Glass fiber will not settle rot, mildew or deteriorate. This product has been GREENGUARD(TM) certified for superior indoor air quality. It helps save energy and offers good sound absorption.