Final answer:
A proper masonry chimney cap should have an overhang projecting beyond all sides of the chimney by a minimum of 2 inches. This overhang protects the chimney from rainwater and other elements, reducing the risk of damage.
Step-by-step explanation:
A proper masonry chimney cap should be constructed of a Portland cement-based mixture and cast or formed so it provides an overhang projecting beyond all sides of the chimney by a minimum of 2 inches.
A proper masonry chimney cap should have an overhang projecting beyond all sides of the chimney by a minimum of 2 inches. This overhang protects the chimney from rainwater and other elements, reducing the risk of damage.
This overhang is necessary to prevent rainwater from entering the chimney and causing damage. It also helps to protect the chimney from the elements and reduces the risk of water seepage, freeze-thaw damage, and chimney deterioration. By providing an overhang, the chimney cap extends the lifespan of the chimney and ensures its proper functionality.