GLEN ELLYN -- The Ceramic Tile Distributors Association (CTDA) will offer a webinar on Thursday, August 11, 2022 at 11 a.m. central time. The session, presented by Logan Reavis, manager of technical services at Mapei, will discuss the substrate flatness requirements found in industry documents and how to properly specify substrate preparation. He will then review the different methods to achieve these requirements, including self-leveling underlayments and their new ANSI standards. To register, visit: