Earthwool R2.5 HD SoundShield 1160 x 580mm (90mm) 9.4m²/packEarthwool SoundShield R2. 5 Wall insulation is a high density glasswool insulation that offers high performance, with exceptional acoustic and energy saving properties, creating a peaceful environment in your home by absorbing sound and keeping it where it should be. Earthwool is made using up to 80% recycled glass and with ECOSE Technology, a sustainable, bio based binder that contains no added formaldehyde.