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® certified for superior indoor air quality. It helps save energy and offers good sound absorption.