How to seal exterior brick to stop water penetration

Jupiterimages/BananaStock/Getty Images

Brick is a durable construction material, although it is quite porous. When it rains, the pores in the brick soak up the water falling on it. If your home has just one layer of brick, the absorbed moisture can at times travel through the brick layer and penetrate the interior of your home.

To prevent or stop a moisture problem, simply seal the brick to close its pores and prevent moisture absorption.

Wet the surface of the brick with the garden hose.

Scrub the brick clean with the long-handled brush and trisodium phosphate (TSP) powder diluted in water according to the manufacturer's instructions. Scrub from the top to the bottom, then rinse the brick clean and allow it to air dry for at least 48 hours.

  • Brick is a durable construction material, although it is quite porous.
  • To prevent or stop a moisture problem, simply seal the brick to close its pores and prevent moisture absorption.

Cover the brick adjacent to the edge of windows, awnings or doors with painter's tape. If you intend to use a paint sprayer, cover windows and doors with plastic sheeting to prevent accidental over-spray.

Stir the water repellent vigorously, using the paint paddle.

Apply the water repellent to the surface with the paint sprayer or long-handled paintbrush, following the manufacturer's instructions. If the repellent accidentally finds its way onto any metal or glass surfaces, wash off immediately with soap and water.

×