Counter Flashing

Counter flashing is a type of flashing that is installed over a primary flashing to help prevent water infiltration into a building envelope. Counter flashing is typically made of a durable, corrosion-resistant material, such as galvanized steel or copper, and is installed over a base flashing layer. The counter flashing is then fitted tightly against the wall or other vertical surface adjacent to the base flashing and sealed with a waterproof sealant or adhesive. Counter flashing is designed to redirect water away from the vulnerable area where the base flashing meets the wall or other vertical surface, providing an added layer of protection against moisture infiltration. Counter flashing is commonly used in roofing and masonry applications, such as around chimneys, skylights, or other roof penetrations.