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The counter flashing is missing on the side of this chimney.Ĭhimney flashings typically are made of one of the following:Īluminum generally is not used since it is not compatible with masonry mortar. The overlap between these two flashings allows movement without disturbing the watertightness. The base flashings are secured to the deck and the cap flashing is secured to the masonry. In any case, the roof deck may move relative to the masonry chimney and good flashing details anticipate this. Let's focus on masonry chimneys since they are the most challenging and one of the most common.Ĭhimneys have a foundation, which may be independent from the house. Round metal chimneys will be flashed much like pipes. Some chimneys are clad in wood, stucco or aluminum siding. As a rule, chimneys are either masonry or metal.

Typically, chimney flashings are more complex than other types of roof flashings and are a common source of roof leaks. Subscribe to Masonry Messenger to receive the masonry resources and information you need to stay current.