Chimney flashing is the system of metal and waterproofing details used where a chimney meets the roof. It usually involves more than one piece of metal, because water approaches the chimney from multiple directions.
Why It Matters
Chimneys are common leak locations. Water can collect, change direction, or run behind poorly detailed flashing if the roof and masonry connection is not handled correctly.
Common Problems
Problems include loose counter flashing, missing step flashing, cracked mortar joints, exposed fasteners, overused sealant, rusted metal, and missing crickets behind wide chimneys.
Building Codes & Industry Standards
Chimney flashing must work with roofing material instructions and masonry conditions. Some chimney widths and roof configurations may require additional water-diversion details such as a cricket or saddle.
Exterior Echelon Notes
Exterior Echelon pays close attention to chimney flashing because it connects roofing, masonry, drainage, and long-term leak prevention.
