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How to seal a brick wall

Updated February 21, 2017

Brick walls are sturdy structures that are not only functional in weight support, but ruggedly aesthetic. Brick walls can be found inside a residential dwelling, separating two rooms or as an exterior facade. However, brick is porous and if not properly sealed, moisture seeps through the wall into the home. To prevent moisture, which can lead to mould and mildew growth, you'll have to seal the brick wall.

Spread dust sheets over the floor or ground against the brick wall to protect your floor's finish or lawn and plants.

Mix 4 parts of warm water with 1 part of TSP in a bucket. Put on rubber gloves and stir the TSP and water with a stiff-bristled brush. Let the brush soak in the mixture for about 10 minutes to saturate the bristles.

Thoroughly scrub the brick wall with the solution, getting all dirt and grime off the surface. The bricks in the wall should be free of any soil or grime.

Dry the brick wall with a heat gun or hair dryer once completely clean. Do not let the brick wall air dry or water spots may appear. Use the heat gun or dryer to penetrate the pores in the brick wall. Rinse the bucket out and set aside once the brick wall is dry.

Open a can of concrete and masonry sealer with a flathead screwdriver. Dip a paintbrush into the sealer and apply the first coat. Brush from top to bottom slowly, treating each brick with the sealer. Let dry as long as recommended by the manufacturer thereafter.

Brush on a second coat of concrete and masonry sealer after the first coat has dried. Let dry for 24 to 48 hours or as long as directed by the manufacturer.

Things You'll Need

  • Dust sheets
  • Rubber gloves
  • TSP
  • Bucket
  • Stiff-bristled brush
  • Heat gun or hair dryer
  • Flathead screwdriver
  • Concrete and masonry sealer
  • Paintbrush
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About the Author

Owen Richason grew up working in his family's small contracting business. He later became an outplacement consultant, then a retail business consultant. Richason is a former personal finance and business writer for "Tampa Bay Business and Financier." He now writes for various publications, websites and blogs.