I need a grout that remains flexible. I plan to install ceramic tile over a somewhat floating radiant floor. The radiant floor consists of a thin layer of foil backed foam, a honey comb to hold the polyethylene tubing, and a resin/mortar tile cover. The resin board is similar to concrete board except the "glue" is resin. The resin boards are about 2X3 feet and are screwed to the floor to minimize movement.
There is perceptible movement of the resin boards. Therefore I need a grout that will not crack, should there be some floor movement.
Does anyone know of a flexible grout that I can use for this unusual installation?
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