FMU1001 Features: * Type: Underlayment * Roll diameter: 11"" * Rolls per carton: 8 * Impact Isolation Class (IIC) Rating: 74 * Sound Transmission Class (STC) Rating: 73 * Reduces both reflective sound noise and through the floor sound transmission * Suitable for use over concrete and organic subfloors * Self-sealing overlap installation system * Fast and easy installation * Structural stability prolongs the life of your floors * Mold and mildew resistant * Built-in moisture barrier-no additional film required * Ideal for radiant heat flooring * Eliminates subfloor imperfections Specifications: * 600 Square feet / roll Dimensions: * Width: 72"" * Length: 100" * Thickness: 0.079"" (2 mm) Warranty: * Limited lifetime warranty