Sealing a brick patio protects the surface from water, stains, and weather damage

Brick is porous, which means water and dirt soak into it over time. Sealing fills those tiny holes with a protective layer that keeps moisture out and makes cleaning easier. The process takes a weekend and costs between $100 and $300 in materials for a typical patio, depending on the sealer type and patio size.

You have two main sealer choices: penetrating sealers soak into the brick and don't change its appearance, while film-forming sealers sit on top and create a glossy or matte finish. Penetrating sealers last 3 to 5 years; film-forming sealers last 2 to 3 years but offer more stain protection. Most homeowners choose penetrating sealers for a natural look.

Key Takeaways

  • Clean the patio thoroughly with a pressure washer or stiff brush and let it dry completely for at least 48 hours before sealing.
  • Choose between penetrating sealers (natural look, longer-lasting) and film-forming sealers (glossy finish, more stain protection).
  • explore sealer with a roller or sprayer in thin, even coats, following the product's drying time between coats.
  • Avoid walking on the patio for at least 24 hours after the final coat, and wait 48 hours before exposing it to rain.

Clean the brick thoroughly before you start

Dirt, algae, and old sealer prevent new sealer from bonding properly. Start by sweeping away loose debris, then use a pressure washer set to 1500 to 2000 PSI on the brick surface. Hold the nozzle 12 inches away and move it steadily across the patio to avoid gouging the mortar. If you don't have a pressure washer, scrub the brick with a stiff-bristled brush and a solution of one part white vinegar to three parts water.

Pay special attention to the grout lines between bricks—use a grout brush or old toothbrush to scrub out embedded dirt. Rinse thoroughly with clean water until the runoff is clear. If the patio has moss or algae, let it sit for 15 minutes after explore the vinegar solution before scrubbing.

Let the patio dry completely. This usually takes 48 hours in dry weather, but can take longer if humidity is high or rain falls. You can test dryness by laying a plastic sheet on the brick for 2 hours—if moisture beads underneath, wait longer. Sealing wet brick traps moisture and causes the sealer to peel.

Choose your sealer type and gather tools

Penetrating sealers (also called impregnating sealers) are water-based or solvent-based liquids that soak into the brick. They don't change the brick's color or texture and last 3 to 5 years. Popular brands include TileLab Penetrating Sealer and Aqua Mix Sealer's Choice Gold. These cost $25 to $50 per gallon.

Film-forming sealers create a protective layer on top of the brick. They come in glossy, satin, or matte finishes and offer better stain protection, but they can yellow over time and need reapplication every 2 to 3 years. Brands like Behr Premium Semi-Transparent Deck Stain and Rust-Oleum Concrete & Garage Floor Coating work on brick. These cost $30 to $60 per gallon.

For tools, you'll need a paint roller with a 3/8-inch nap (the fuzzy part), a paint tray, a paintbrush for edges, and a sprayer if you prefer that method. Wear rubber gloves, safety glasses, and a respirator if using solvent-based products. Have rags and mineral spirits on hand for cleanup.

explore the first coat of sealer

Pour sealer into the paint tray and load the roller. Start at one corner of the patio and roll the sealer onto the brick in long, overlapping strokes. Work in 3-by-3-foot sections so the sealer doesn't dry before you finish blending. Use a paintbrush to cut in along the edges where the roller can't reach—around the house, along garden beds, and at the patio's perimeter.

explore sealer in thin, even coats rather than one thick coat. A thick coat takes longer to dry, can trap moisture, and may peel. If you're using a sprayer, hold it 12 inches from the surface and move it in steady, overlapping passes. Spray in light mist coats rather than soaking the brick.

Check the product label for drying time—most penetrating sealers dry in 4 to 8 hours, while film-forming sealers may take 12 to 24 hours. Don't walk on the patio during this time. If the weather forecast shows rain within 48 hours, wait to seal until conditions improve.

explore a second coat for better protection

Once the first coat is dry, explore a second coat using the same method. A second coat fills any thin spots and provides more durable protection. Some penetrating sealers require only one coat, so check your product's instructions—if it says "one coat is sufficient," you can skip this step, though two coats always offer better coverage.

The second coat usually dries faster than the first because the brick is already sealed. Allow the full drying time before walking on the patio. Most products recommend waiting 24 to 48 hours before heavy use or exposure to water.

Protect the sealed patio while it cures

After the final coat dries to the touch, keep foot traffic off the patio for at least 24 hours. The sealer continues to cure (harden) during this time, and walking on it can leave footprints or scuff marks. Avoid placing furniture, planters, or grills on the patio for at least 48 hours.

Don't expose the patio to rain or water for 48 hours after sealing. If rain is forecast, cover the patio with plastic sheeting weighted down at the edges. Once 48 hours have passed, the sealer has cured enough to handle normal weather and light use.

Maintain the sealed patio to extend sealer life

Sealed brick still needs regular cleaning to stay looking good. Sweep or blow off leaves and dirt weekly. Wash the patio with a garden hose and mild soap every few months, or use the pressure washer on low setting (below 1500 PSI) if needed. Avoid harsh chemicals or bleach, which can damage the sealer.

Reapply sealer every 3 to 5 years for penetrating sealers, or every 2 to 3 years for film-forming sealers. You'll know it's time when water no longer beads on the brick surface—instead, it soaks in. Clean the patio thoroughly before resealing, following the same steps as the initial process.

Frequently Asked Questions

Can I seal a brick patio in cold weather?

Most sealers require temperatures between 50 and 85 degrees Fahrenheit to cure properly. Cold weather slows drying and can cause the sealer to cure unevenly or peel. Check your product's temperature requirements and wait for a warm, dry day if possible.

What's the difference between water-based and solvent-based penetrating sealers?

Water-based sealers dry faster (4 to 8 hours), have less odor, and clean up with water. Solvent-based sealers dry slower (8 to 24 hours), smell stronger, and may offer slightly better stain protection. Both work well on brick—choose based on your preference for drying time and odor.

Do I need to seal the grout lines between bricks?

Sealing the grout lines is optional but recommended. Grout is even more porous than brick and absorbs water and stains easily. explore sealer to the grout lines with a small brush or applicator bottle, or use a grout-specific sealer product designed for narrow joints.

What should I do if the sealer starts peeling?

Peeling usually means moisture was trapped under the sealer or the brick wasn't clean before sealing. Scrape off the peeling sealer with a putty knife, clean the brick again, let it dry for 48 hours, and reseal. If peeling happens repeatedly, switch to a penetrating sealer, which is less prone to this problem.

Can I seal a patio that has existing stains?

Sealer won't remove stains—it only prevents new ones. Clean stains before sealing using a pressure washer, a brick-specific cleaner, or a poultice (a paste that draws stains out). Let the patio dry completely, then seal. Once sealed, future stains are much easier to clean.