Properly insulating a structure using Johns Manville building insulation helps preserve our environment by reducing energy consumption for heating and cooling, reducing the pollution resulting from fuel burning, reducing the emission of hazardous air pollutants during manufacturing and reducing waste through the utilization of recycled materials. Great for small projects and filling in gaps and patches Best for use in walls and basements Contains 50% recycled glass JM fiberglass insulation carries the UL ecology certification for reduced environmental impact