The chimney liner is the interior channel that carries combustion gases from your appliance to the outside. It's one of the most important safety components of your chimney system — and one of the most commonly damaged. Here's what you need to know about liner types, when replacement is needed, and what installation involves.
A chimney liner serves three functions: it contains combustion gases and prevents them from seeping into living spaces, it protects the chimney structure from heat and corrosive byproducts, and it provides the correct flue size for your appliance. A damaged or improperly sized liner compromises all three functions — learn about the dangers of a cracked liner.
Clay tile liners are the most common type in older homes. They're durable under normal conditions but crack under the extreme temperatures of a chimney fire. They also don't handle the corrosive condensate produced by modern high-efficiency appliances well.
Stainless steel liners are the industry standard for new installations and relining projects. They come in flexible and rigid versions. Flexible liners can navigate the bends and offsets common in older chimneys. Rigid liners are used in straight flues and offer better airflow. Stainless liners are durable, corrosion-resistant, and appropriate for wood, gas, and oil appliances.
Aluminum liners are only appropriate for certain gas appliances. They're less expensive than stainless but have a shorter lifespan and more limited application.
Cast-in-place liners are a poured cement product that's installed inside the existing flue. They're used in severely deteriorated chimneys where a metal liner isn't practical.
Flexible liner installation typically takes a half day to a full day. The liner is measured, cut to length, and lowered down the flue from the top. A top plate is installed at the chimney crown, and a connector is attached at the bottom to connect to the appliance. The liner is then tested for proper draft before the job is complete.
Horizon Chimney Sweep serves Vancouver, Woodland, and all of Southwest Washington. Licensed, locally owned, and honest about what you need.