Chimney flashings are located along the base of chimneys at the point where a chimney meets the roof. Understanding that chimneys that protrude through your roof are commonly made out of either metal or brick, and your roofing components are made out of wood frame and roof shingles, one must realize that the temperature expansion and retraction rate on these 2 different type of materials varies a great deal. Therefor in order to protect watertight conditions along that area a firm yet flexible material should be used for its flashing. Rolls of lead are often used in this process.
