what masonry material is used for the chimney cap?
Regular chimney maintenance is essential to prevent damage, deterioration and future high-cost chimney repairs. Masonry Chimneys. A masonry chimney is constructed of a variety of masonry and metal materials, including brick, mortar, concrete, concrete block, stone, flue tile, steel and cast iron. All masonry chimneys contain combinations of, or possibly all of, these materials, most of which are adversely affected by direct contact with water or water penetration.