The lowest face of a chimney should have a(n) _________ flashing.

The lowest face of a chimney should have an apron flashing. Apron flashing is designed to direct water away from the top of the chimney, preventing it from seeping behind the brickwork or other materials used on the chimney. This type of flashing is installed at the base of the chimney, running down the roof slope to ensure that any water that comes down from the chimney is channeled away from the roof and into the gutters or downspouts. This is particularly important because the junction where the chimney meets the roof is often a vulnerable area for leaks.

The presence of effective apron flashing helps to maintain the integrity of the roof system by protecting against moisture infiltration, which could lead to more severe issues such as wood rot, mold, or structural damage if not properly managed. Proper installation and maintenance of apron flashing are essential for ensuring that the chimney is watertight and well-protected.