R14 x 15-inch Comfortbatt Wood Stud Stone Wool InsulationROCKWOOL COMFORTBATT is a semi rigid stone wool batt insulation for exterior wood and steel stud applications in both new construction and renovations. It features a unique flexible edge designed to compress as the batt is inserted then spring back, expanding the batt against the frame studs to give a complete fill. This flexibility ensures the expected R value is achieved and maintained. Non combustible and fire resistant, COMFORTBATT will not