Designed and built with the highest quality materials, Knauf R19 KFR is the perfect choice for your insulation needs. With its generous size of 6.25" X 15" X 39.16' and coverage of 49 square feet, this energy-saving option boasts an impressive efficiency rate of only $1.02 per square foot. You'll be able to save on your monthly energy bills while simultaneously reducing your carbon footprint.