We've got a fireplace in our newly aquired home (circa 1939). The decorative plywood surround has been severely damaged, and removed. Thus leaving the old, ugly, unevenly spaced brick exposed. We have quite a bit of 12" slate tile leftover from our kitchen floor remodel, and thought that it might look good to cover the old brick. The tiles are 1/2"-3/4" thick, and are cut smoth on one side and left rough on the other. We'd like to place them rough side out, on an angle (in a diamond configuration).
Right now we can't afford to "have this done profesionally", and I have done tile before... but only horizontaly (never on a wall). I'm not sure what to use to adhere the slate to the brick. Mortar, thinset, mastic, liquid nails, chewing gum? What would you suggest?