GreenFiber's Sanctuary loose-fill insulation is engineered to fill tiny crevices and gaps, creating a dense, scientifically advanced barrier capable of reducing the power of sound by up to 60%. Sanctuary insulation keeps homes cooler in the summer and warmer in the winter, reducing heating and cooling costs by up to 25%. Sanctuary also has a Class-1/A fire rating, which qualifies as a fire-blocking material.