Henry 565 FloorPro Self-Leveling Underlayment A Portland cement-based, self-leveling underlayment used to smooth and flatten interior surfaces prior to the installation of floor covering. HENRY 565 can be walked on in as little as 2 hours and ceramic tile can be installed in only 6 hours. Can be installed from a 1/8 thickness up to 5 inches. Designed to be used with today's glue-down and glueless flooring. Must use Henry 564 FloorPro Underlayment Primer prior to use. Coverage 43 sq. ft. with 40 lb. bag at 1/8 thickness. Working time 10 minutes 70 deg. F. 40 pound bag of powder. Length Varies, Thickness 1/8 In. to 5 In., Coverage Area 43 Sq. Ft. 1/8 In. Thick, Pkg Qty 1, Package Type Bag This product contains a chemical known to the State of California to cause cancer.