I have a Fireplace that uses a set of direct vent logs. The exterior of the fireplace is brick, built out in a couple of places to look like columns (the extend 1/2" out more than the other bricks). It also has 3 courses of bricks that jut out 1/2" per course under the mantel (stone mantle). I am looking to face the entire thin with granite tiles 12 x 12) What is the best way to build up the thickness to get the entire thing flat? I was thinking thinset to smooth the bricks flat, and cut pieces of 1/2" concreate board fastened with tapcons into the brick to take up the space (probably using some sort of adhesive as well where the boards are layered out).
Any other options?