Furnace Stack (Furnace Flashing)

Furnace stacks are designed to create a watertight seal where furnace exhaust pipes pass through a sloped roof. Each furnace stack we produce is custom fabricated to your selected pipe diameter and stack height using durable sheet metal for a secure, long-lasting fit. The base flashing sits flat to the roof surface while the stack is formed to accommodate common roof pitches, allowing installers to trim and fit the flashing as needed during installation.