How to line a chimney

Written by steve smith
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A chimney can become completely clogged with residue from smoke and debris. This residue can often become a fire hazard and is difficult to clean from brick. That is why chimneys are lined. Today, homeowners use flexible chimney liners to line their chimney because they are generally easier to install. A rigid liner often gets caught on obstructions inside the chimney, which are a natural part of the masonry.

Skill level:

Things you need

  • 1 Chimney liner
  • 1 Chimney probe
  • 1 Extension ladder

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  1. 1

    Place a chimney probe into the chimney by lowering it down from the top of the chimney and then drawing it back up. Use the long probe to determine how wide a chimney liner you can install into the flue. Keep in mind that the wider the liner the better, because more smoke will be exhausted from the fireplace. However, a wider liner can be more difficult to install.

  2. 2

    Measure the length of the chimney by dropping a string with a weight tied to the end into the chimney (a pendulum level will also work). When the string reaches the bottom of the chimney (or top of the fireplace flu), make a mark on the string, then withdraw it and measure the length of the string. Have someone check to ensure the weight has reached the fireplace flu while you hold the string at the top of the chimney if necessary.

  3. 3

    Order chimney liner to the length you have measured and then slide the first section of flexible chimney liner into the top of the chimney. Carefully slide it down the chimney shaft, working the liner back until the entire length of line is installed in the chimney shaft.

  4. 4

    Work the liner all the way to the bottom of the chimney, until it is flush with the top of the flue. When open, the flu will draft right into the chimney liner. The stainless-steel finish prevents creosote build-up on the surrounding brick, and that extends the life of your chimney.

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