Chimney Flashing Repair Guide

Why Chimneys Leak & How the Repair Is Properly Done

A chimney interrupts the roof's water path with a solid masonry obstacle, which is why it is the most common leak location on an otherwise healthy roof. Four separate pieces of metal work together — apron, step, cricket and counter flashing — over ice-and-water membrane. This guide explains how that assembly works, the five ways it fails, how to tell a flashing leak from a cracked crown, the full step-by-step repair and how to choose between copper, galvanised steel and aluminium.