Earthwool® Acoustic roll can improve Rw ratings in wood stud construction by 3 to 5 decibels and in metal stud construction by 8 to 10 decibels, depending on the complexity of the wall configuration and the thickness/density. Earthwool® Acoustic roll can be used for exterior and interior walls. Super-soft to handle and install, Earthwool® is made using up to 80% recycled glass and with ECOSE® Technology, a sustainable, bio-based binder that contains no added formaldehyde.