The wash the brick mason is talking about is an acid wash. That should take care of the white stains. As far as the vertical brick looking a different color, the acid wash should take care of that too ... read more
Interior chimneys are at least 4" larger in all four directions than the flue they contain. A chimney containing a 12"x12" clay flue liner must be at least 20" by 20". Combustible materials must be ke ... read more