How to Repair Grout Inside a Fireplace

Written by kevin mcdermott
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The grout between the bricks of your fireplace is made of the same material as the grout between ceramic tiles in your home. Like tile grout, brick grout can crumble or loosen long before the bricks themselves wear out. Repairing grout inside a fireplace isn't complicated, but it is somewhat labour-intensive, as you have to dig out the old grout. Use a grout bag (similar in concept to a pastry bag) to apply grout to brick.

Skill level:

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Things you need

  • Grout saw (small, straight blade on a handle)
  • Vacuum hose
  • Grout
  • Wood spoon
  • Grout bag
  • Short dowel rod, slightly wider than the space between the bricks
  • Stiff scrub brush

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  1. 1

    Scrape out the damaged grout from between the bricks with a grout saw. Dig forward and backward in the grout line with the saw without scraping the brick face. Dig out all of the damaged grout, and slightly dig the saw into the surrounding solid grout.

  2. 2

    Vacuum the pulverised grout out of the lines between the bricks and off the floor below the lines. Make sure the area is free of dust.

  3. 3

    Pour grout into the grout bag, using a wood spoon to scoop and guide it. Close the bag and out the correct tip on it. The tip should be slightly smaller than the width of the space between the bricks.

  4. 4

    Position the tip of the grout bag at the end of the first open grout line. Compress the bag to squeeze grout out of it. Pull the bag backward along the line as the grout fills it, keeping your pace slow and steady. The grout should completely fill the line, but not sit on the brick face.

  5. 5

    Let the grout set up for about 10 minutes. Run the end of your dowel rod along the line to flatten out the line and put a slight curve in it. Let it set for another hour, then brush off any residual grout sand with a stiff brush.

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