Believe it or not just eyeballing and keeping an eye on level and plumb every once in awhile. It supposed to look old so just making it look that way. Ties every 4 course and there is about a 1/2" gap between the brick and the cement board so I am back filling with mortar also! Doing 3 course at a time, letting it set a bit then pointing the joints (keeping it a little rough for effect) then wire brushing the brick face to remove any slop and define the joints and show the brick edge a bit.....I will take a few closeup tomorrow!
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