Hacker Industries Inc. has named Bajko Gypsum Concrete, based in Boyne City Mich., and Gypsum Floors of Denver as new members of its nationwide network of certified and trained licensed applicators. Both companies will now offer Hacker Industries' premier line of floor underlayments, including Firm-Fill Gypsum Concretes, Gyp-Span Radiant and Hacker Sound Matt II.