these are standardized measures required by ANSI A108. Often, it is of crucial importance to use tile manufactured in accordance with ANSI A137.1 to achieve less-than- maximum allowable lippage in an installation. – Mark Heinlein, NTCA Training Director, NTCA Technical Trainer QUESTION I have a client whose installer used mastic to install white marble and now it’s turning yellow. I looked in the TCNA Handbook, but could not find any information. Can you please guide me where it is mentioned? ANSWER ANSI A136.1 is the American National Standard Specification for Organic Adhesives for Installation of Ceramic Tile. It provides infor- mation for use of Type 1 and Type 2 organic adhesives for installation of ceramic tile. ANSI A108.4 is the Standard for Installation of Ceramic Tile with Organic Adhesives or READY-TO-USE Grout is an advanced professional-grade, ready- to-use grout that delivers superior color con- sistency and excellent stain resistance. To save time and money on the jobsite, READY-TO- USE Grout does not require mix- ing or sealing and can be spread continuously for up to 20 minutes before cleaning is required, which is a significant improvement compared to other products on the market that require cleaning after only five minutes. Ideal for interior installations and re-grouting applications involving ceramic tile, glass tile and stone, READY-TO-USE Grout is crack resis- tant and inhibits the growth of stain- causing mold and mildew in grout joints. For color customization, READY- TO-USE Grout is available in 40 col- ors, including a unique Translucent option that contains glass beads which allow for light to pass through and reflect the colors of the sur- rounding tiles. For more information, visit www.laticrete.com. ASK THE EXPERTS –––––––––––––––––––––––––––––––––––––––––––––––––––– 22 TileLetter | September 2018