Johns Manville's R-15K Kraft Thermal & Acoustical Fiberglass Insulation 3-1/2 in. x 16 in. x 96 in. also contributes to improved indoor comfort by reducing airborne sound transmission between rooms and from outside sources. The noncombustible fiberglass composition resists mold growth when kept dry and supports long-term durability in residential and light commercial applications. Easy to handle and install, this insulation helps meet building energy codes while supporting lower heating and cooling demands. With 74.66 sq. ft. of coverage per bundle, it provides dependable performance for efficient, code-compliant wall systems.