Your masonry chimney is more than just a stack of bricks; it’s actually a complex ventilation system crucial for safely expelling smoke and exhaust from your home. A vital component of this system is the chimney liner, which acts as a protective barrier within the flue. A damaged liner poses a significant fire risk and can expose your family to dangerous carbon monoxide fumes. Annual chimney inspections are essential to ensure your liner is doing its job.
What is a Chimney Liner
A chimney liner is a rigid or flexible tube or covering installed around the chimney flue to protect the interior masonry walls from heat and combustion gases when burning wood in the fireplace or stove. It provides a smooth, continuous pathway for smoke and combustion byproducts to exit your home at the top of the stack efficiently. Most homes in eastern MA and RI have chimneys initially built with a terra cotta clay liner. However, some older homes have chimneys constructed before building codes began requiring a liner fifty years ago. So, if you have an unlined chimney, we strongly recommend installing a stainless steel liner.
Why Your Chimney Needs a Liner
Chimney liners serve several critical purposes:
Fire Prevention
Liners prevent hot gases and embers from igniting nearby combustible materials, significantly reducing the risk of chimney and house fires. Cracks in an unlined or damaged chimney can allow heat to transfer, potentially igniting nearby framing or insulation that can quickly engulf an entire home in flames.
Expels Carbon Monoxide
A properly functioning liner ensures that dangerous carbon monoxide gas, a byproduct of combustion, is safely vented outside. A damaged liner can leak this deadly odorless and colorless gas into your home.
Improve Efficiency
The liner’s smooth surface improves the draft and contains the heat within the chimney. This enhances the efficiency of your fireplace, stove, or furnace, thus reducing fuel costs. The improved efficiency also improves comfort with a warm and cozy ambiance.
Protects Masonry Walls
The acidic byproducts of combustion can corrode the chimney’s masonry from the inside out. Liners protect the structure from this damage, extending its lifespan. In areas with humid climates, like ours, the challenges are even greater. Extreme temperature swings, heavy snowfall, and frequent rain contribute to faster deterioration. Freeze-thaw cycles, where moisture penetrates cracks and expands when frozen, can cause even more damage over time.
Types of Flue Liners
Flue liners are available in a variety of flexible and rigid materials, however the following two are the most common:
Stainless Steel Liners
Horizon Chimney Services highly recommends stainless steel liners for relining and new installations due to their durability and resistance to moisture, corrosion, and pests. They have outstanding insulative properties and are suitable for most fuel types.
Terra Cotta Liners
Terra cotta or ceramic liners are the most common due to their lower cost and long life span. While less expensive than steel, they are more susceptible to cracking and damage, especially in today’s higher efficient appliances.
Signs Your Chimney Liner Needs Repair
Your liner needs routine inspections and sweeping to protect its insulative properties. If you notice any of the following signs, contact a chimney professional before relighting the appliance.
- Visible Cracks or Damage
- Bits of clay or mortar in the Firebox
- Poor Draft
- Smoky Fireplace
- Unusual Odors
Call Horizon for Expert Chimney Liner Repairs – Relining – Installations
Horizon Chimney Services – Your Local Hearth Expert. With over three decades of experience, homeowners in Norfolk MA, Newton MA, Sudbury MA, Cumberland, RI, and surrounding eastern MA and RI towns have trusted our highly rated certified technicians. We are committed to prolonging the lifespan of your chimney, venting system, and attached heating appliances with expert chimney liner repairs, relining, installations, and more. Contact Horizon Chimney Services to schedule your visit today!