Does SunTouch mat weaken or strengthen my floor?
SunTouch mats and WarmWire have been tested by the Tile Council of America (TCA) to ASTM C 627, officially known as “A Standard Test Method for Evaluating Ceramic Floor Tile Installation Systems Using the Robinson-Type Floor Tester”. It tests for deflection under loads, such as mortar for Portland cement installations, concrete for thin-bed installations, and plywood with a composition board or other sheeting material. These tests passed for HEAVY classifications, such as shopping malls, commercial areas and etc. SunTouch mats and WarmWire apparently add tensile strength to the tile and mortar sandwich. When in doubt, follow TCA and ANSI (American National Standards Institute) specifications.