How to Seal a Brick Fireplace


A fireplace surrounded by brick adds warmth and a cozy feeling to a room. Brick fireplaces may require sealing to keep moisture absorption to a minimum. Excessive moisture on bricks may damage the stone and result in a crumbling fireplace. Clean the brick surface first to avoid sealing in dirt and grime. After cleaning, use a water sealer appropriate for brick surfaces to seal your fireplace properly.

Things You'll Need

  • Towels
  • Bucket
  • 1 tsp. liquid dish soap
  • Stiff-bristle brush
  • Rags
  • Pump sprayer
  • Water sealer
  • Lay towels on the floor in front of the fireplace. Mix 1 tsp. liquid dish soap into a bucket of water. Wet a stiff bristle brush with the cleaning mixture.

  • Scrub the brick with the brush. After washing, wet a rag and wipe it over the brick removing the soap residue. Press towels into the brick to help remove the water. Allow the brick to dry completely overnight.

  • Pour a water repellent sealer into a pump sprayer. Pump the sprayer to form pressure.

  • Position the nozzle at the top of the fireplace and 3 to 4 inches from the brick. Start spraying the brick, sweeping the nozzle back and forth, working your way down the fireplace. Saturate the brick completely.

  • Allow the first coat to dry, approximately one to two hours. Apply a second thin coat to the brick. Allow the second coat to dry completely before using the fireplace.

Tips & Warnings

  • Do not add the second coat if you feel the first coat has sufficiently sealed the fireplace.

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