How to Seal a Chimney Pipe

Written by g.k. bayne
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How to Seal a Chimney Pipe
Sealing stove pipe keeps exhaust gases in the flue. (Jupiterimages/ Images)

Chimney pipes conduct exhaust gases from a combustible device into the chimney and the outdoors. Sealing the chimney pipes ensures that the gases will not escape into the indoor living areas possibly causing a hazardous situation. Chimney pipe typically comes in 2-foot and 3-foot long pieces. One end of the pipe is crimped while the other is smooth. Between each section of chimney pipe, the crimped male end fits into the smooth female end.

Skill level:

Things you need

  • Black furnace cement
  • Putty knife
  • Rag
  • Sheet metal screws
  • Powered screwdriver

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  1. 1

    Coat the crimped male end of the stovepipe with a thin layer of black furnace cement. Spread the cement 1/16-inch thick around the circumference of the crimp area.

  2. 2

    Insert the male crimp end into the female end of the joining chimney pipe. Allow the black furnace cement to ooze from the mating surfaces.

  3. 3

    Wipe excess furnace cement from the joint after the two pieces have fully joined together. It will take some pressure to push the pieces together in forming a tight joint.

  4. 4

    Install three sheet-metal screws through the female pipe end into the male crimp end using a powered screwdriver. Evenly space the three screws around the circumference of the pipe joint.

  5. 5

    Follow the black furnace cement manufacturer's labelling and allow the product to fully cure before applying heat from the device to the stovepipe joint.

Tips and warnings

  • Consult the gas or woodstove manufacturer's installation instructions for specific stovepipe type and clearances from nearby combustible surfaces.
  • If you feel uncomfortable sealing the chimney stove pipe, contact a certified heating and ventilation technician.

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