Gyp-Tek is a Licensed Applicator for Hacker Industries. Hacker Floor Underlayment offers self-leveling products for interior use only, under the brand names of Firm-Fill Gypsum Concrete and Gyp-Span Radiant. Gyp-Span Radiant locks tubes in place and prepares floor for floor coverings. A rapid curing product for use under carpeting, tile, wood or stone floors. Sound mats are engineered to limit sound transmission in Multi-family homes, Apartments and Hotels. Call us to help choose the right Underlayment product. Visit www.hackerindustries.com for recommended specifications and full product line.