A Square concrete crown constructed for a Masonry Chimney and Fireplace which contains a drip edge to divert the water away from the brick below is recommend by the Brick Institute of America.
To create a new crown, a form is constructed out of wood to fit the chimney with an overhang to minimize water running down the chimney. Concrete is poured into the form. When the concrete is set, we remove the form. Sealing with asilane-siloxane clear penetrating water repellent on the sides of the chimney as well as the chimney crown to help keep moisture from getting into the chimney.