Maintain a comfortable climate in your home with this Johns Manville fibreglass insulation. The pre-cut material measures 16 in W x 48 in L x 8 1/2 in D and makes installation easy. It's formaldehyde-free to help maintain the air quality of interior spaces. This thermal resistance insulation boosts energy efficiency by reducing the workload on heating and cooling systems. It's well-suited to wood framing and attic applications and for installation in exterior walls. The material controls noise by absorbing vibrations and helps to moderate moisture levels. Cut the pieces of attic insulation with a utility knife as needed for a correct fit in any size space. GREENGUARD certification shows this insulation has minimal impact on air quality and contains low VOC concentrations.