How to Replace a Flue Tile

Inside some old fireplaces, 24-inch-long terra cotta flue tiles line the chimney walls from the firebox up through the top of the chimney. These flue tiles are prone to cracking when they become too hot, such as when you have a chimney fire, and cracked tiles need to be replaced as soon as possible to help keep your fireplace safe to use. If the cracked tiles are low, near the firebox, you can replace them yourself. Top tiles, however, should only be replaced by a technician who can safely reach down the chimney from your roof.

Safety goggles
Respirator mask
Work gloves
Flashlight
Masonry hammer
Fireplace-grade cement masonry mortar
5-gallon bucket
Scrap wood for stirring
Trowel
Flue tile

Instructions

- 1
  Make sure the fireplace is completely cool before working. Put on safety goggles, a respirator mask and work gloves for protection.
- 2
  Strike the broken flue tile in several places with the flue hammer. Use a flashlight to help you see while you work.
- 3
  Pick out all the tile pieces and set them aside for later disposal.
- 4
  Combine the cement masonry mortar with water, as directed by the manufacturer, in the 5-gallon bucket. Stir well using the scrap wood.
- 5
  Lay a 1-inch-thick layer of the mortar over the replacement tile area inside the chimney using the trowel.
- 6
  Set the new flue tile into the area, tapping lightly with the masonry hammer to ensure good contact between the mortar and tile.
- 7
  Allow the mortar to set overnight before using your fireplace.

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