Chimney Liners

Are Chimney Liners Required by Code

Are Chimney Liners Required by Code?


Understanding building codes is essential for homeowners, especially those who enjoy the simple pleasure of a fireplace or wood-burning stove. One of the questions that often arise in this context is, “Are chimney liners required by code?”

This article aims to address this issue, outlining what the building codes generally say, why a liner is crucial, and the consequences of not having one.

What Does the Building Code Say?

Building codes may vary depending on your jurisdiction, but in most places in the United States, the National Fire Protection Association (NFPA) standards do require chimney liners for new construction. According to NFPA 211, chimneys must have a liner that adequately serves the connected appliance and is capable of handling the products of combustion. The International Residential Code (IRC) often has similar stipulations.

Why is a Chimney Liner Necessary?

Even if a liner wasn’t mandated by law, it plays several critical roles:

  1. Safety: A liner provides a barrier between the combustion products and the house’s structure, reducing the risk of a house fire.
  2. Efficiency: It improves the chimney’s draft, allowing smoke and gases to exit more efficiently.
  3. Longevity: A liner protects the chimney masonry from corrosive byproducts that could reduce its life span.

Types of Chimney Liners

Different materials are acceptable according to code, including:

  1. Clay Tile Liners: The most traditional and cost-effective option, but less resilient against sudden temperature changes.
  2. Metal liners, usually made of stainless steel or aluminum, are durable but more expensive.
  3. Cast-in-Place Liners: A cement-like product that forms a smooth, seamless lining suitable for all fuels

Consequences of Not Complying

Failure to have a chimney liner not only puts you at odds with building codes but can also:

  1. Increase Fire Risk: Without a liner, the risk of heat transferring to combustible parts of the home increases significantly.
  2. Reduce Efficiency: A linerless chimney is less efficient at channeling smoke and could result in backdrafts.
  3. Result in Legal Issues: Non-compliance could result in fines or even legal liability in the event of a fire.


The question of whether chimney liners are required by code is not just a matter of legal compliance but also one of safety and efficiency. While laws may vary depending on your location, the unanimous professional recommendation is to have a chimney liner installed.


Knowing and adhering to your local building codes isn’t just a matter of avoiding fines or legal woes; it’s a crucial part of responsible homeownership. A chimney liner serves multiple purposes, all of which aim to keep you and your home safe and efficient. So, if your chimney doesn’t have a liner, it’s time to consult a professional.