How to Repair a Firebox Liner for a Wood Stove


Designed to be airtight and efficient, modern wood stoves made from steel are lined with firebrick inside the firebox. The sacrificial and replaceable firebrick serves a dual purpose. It keeps the fire away from the steel itself and it also absorbs heat to release it into the room. Firebricks, made of clay and ceramic, are light and easy to handle. They measure 9-by-4-by one-half inches, are tan or beige in color and come in a box of six.

Things You'll Need

  • Firebrick
  • Work glove
  • Dropcloth
  • Circular skill saw with masonry blade
  • Place a dropcloth around the wood stove to prevent ash or dirt from getting on the floor.

  • Inspect the firebrick liner inside the wood stove. Make note of those firebricks that are black, crumbly or cracked. While cracked firebricks don’t need immediate replacement, they'll need replacement soon. Do preventative maintenence by replacing these, as well.

  • Count the number of bricks that require replacement.

  • Wear gloves to remove broken bricks and immediately replace with new ones. Not every firebrick in the liner needs replacement, just the damaged, severally blacked or broken bricks.

  • Cut any brick as needed to replace a smaller-sized brick. Use a circular skill saw with a masonry brick to cut the brick accordingly. Measure the old brick, mark a new brick with the measurements and cut.

  • Dispose of old brick or use it to line your outside fire pit, if desired.

Tips & Warnings

  • Firebricks are abrasive to the skin. Wear gloves when handling them.
  • Most hardware stores, home improvement centers or specialty wood stove stores carry replacement firebrick.
  • When repairing the firebrick liner, clean out the chimney pipe from last season's use. Airtight wood stoves build up creosote in the stove pipe which can lead to stove pipe fires if not properly cleaned each season.

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