I am tiling my new fireplace, and at one end had to bolt a 2x4 to make the thing symmetrical. The rest of the surface is clay brick covered with concrete patching to give an even surface, and I intend to tile directly on top of that. My question is, can I tile straight onto the 2x4, or do I need to add a backerboard of some kind. I know the easier answer is to say add it, but is it really necessary?
BTW, the wood is nowhere near the heat source - it's about 3' from the side of the fireplace opening.
TIA
Mat