94% recycled rubber underlayment manufactured in the United States. Created in the year 2000, our underlayment is the original and leading recycled rubber sound control underlayment. Available in multiple thicknesses, 2mm, 5mm, 10mm, and 12mm, to cover a wide range of performance requirements. Made from reclaimed rubber materials to reduce the impact on the environment and keep material out of landfills. This product is 100% USA sourced and made. Superior long term acoustical performance, supported by more than 550 independent lab/field tests and a team of acoustical engineers. Any type of hard surface flooring can install directly to our underlayment. Tile, hardwood, vinly, LVT (2mm and 5mm only), laminate, and more. Ships protected in a box whether through Prime or direct from IsoStore's inventory in Indiana. - Crack isolation membrane (ANSI A118.12) protects ceramic, porcelain and stone tile from substrate crack. - Commercially rated by the Tile Council of North America. - Supported by over 550 independent lab/field test and a team of acoustical engineers. - Superior long-term acoustical performance-will not degrade over time. - R-value less than 1, appropriate for install over heated floors. - Rated for Density (ASTM D297), Thickness (ASTM D3676), Tensile Strength (ASTM D412, Die C), Compression @ 100 psi (ASTM F36), Shore A Hardness (ASTM D2240), and Crack Resistance (ASTM C627).