Adding a hearth to Pier/Beam structure that has plywood subfloor
Hello from Austin Tx. We're redoing our fireplace in travertine and adding a hearth. The complication is the house is on pier/beam and has a plywood subfloor. According to our calculations and using our fireplace literature, we need 4-5 layers of 1/2 inch Durock cement board to meet the fireplace heat barrier recommendations. Is there a different product that has a lower combustibility rating we might find better/easier to use? We've made MANY calls to tile, stone, and fireplace dealers and no one has any ideas.
Thanks for your help. Judy and David