Pressure washing brick home surfaces is one of those weekend projects that feels incredibly satisfying but can also be a little nerve-wracking if you've never done it before. There is something oddly hypnotic about watching years of built-up grime, moss, and pollution stains just melt away under a stream of water. However, brick isn't as invincible as it looks. While it's literally the stuff of "The Three Little Pigs" and is built to last centuries, a high-pressure blast can do some real damage if you aren't careful with your technique.
If you're looking to boost your curb appeal or just get rid of that green tint on the north side of your house, you've come to the right place. We're going to walk through how to get that deep clean without accidentally etching your masonry or blowing out the mortar.
Why You Shouldn't Just "Point and Shoot"
It's tempting to grab the most powerful pressure washer you can find, crank it to the highest setting, and go to town. But here's the thing: brick is a porous material. It's basically a hard sponge. If you use too much force, you can actually strip away the "fire skin"—the hard outer layer created during the kiln-firing process. Once that layer is gone, the softer interior of the brick is exposed to the elements, and it'll start to crumble much faster.
Then there's the mortar. Mortar is the glue holding everything together, and it's significantly softer than the brick itself. A direct hit from a high-pressure stream can gouge holes in the mortar lines, leading to water leaks and structural issues down the line. That's why pressure washing brick home exteriors requires a bit more finesse than cleaning a concrete driveway.
Getting the Right Equipment Together
Before you start, you need to make sure your gear is up to the task. You don't need an industrial-grade machine. In fact, an electric pressure washer often provides plenty of power for a residential brick job. If you're using a gas-powered one, you just need to be extra mindful of the settings.
The most important part of your setup isn't the machine itself, but the nozzles. Most kits come with a variety of color-coded tips. * The Red Tip (0-degree): Stay away from this. It's a laser beam that will carve your initials into the brick. * The Yellow Tip (15-degree): Still usually too aggressive for brick. * The Green Tip (25-degree): This is generally the sweet spot for tougher stains on newer brick. * The White Tip (40-degree): The safest bet. It provides a wide, gentle fan of water.
You'll also want a dedicated brick cleaner or a mild detergent. Using a cleaning solution does most of the heavy lifting so the water pressure doesn't have to.
Prepping Your Workspace
Don't just jump into the washing. Spend twenty minutes prepping the area, and you'll save yourself a lot of headaches later. First, go around and check the condition of your mortar. If you see spots where it's already crumbling or falling out, do not pressure wash those areas. You'll only make it worse. You'll want to patch those spots and let them cure for a few weeks before cleaning.
Next, cover up your outdoor outlets with tape and plastic. Even if they have "weatherproof" covers, a direct blast of water can find its way in. Move your patio furniture, and if you have delicate plants or a prized rose bush near the walls, cover them with a tarp or soak them with a garden hose first. Wet leaves are less likely to absorb any runoff from the cleaning chemicals.
The Proper Technique: Step-by-Step
When you're finally ready to start pressure washing brick home walls, think of it as a three-stage process: soaking, soaping, and rinsing.
1. The Pre-Soak
Never apply detergent to dry bricks. Because brick is porous, it'll soak that soap right into its core, which can leave a weird, hazy film that's almost impossible to get out. Start from the bottom and work your way up with plain water from your garden hose or the pressure washer on a very low setting. You want the bricks to be saturated but not dripping wet when you apply the soap.
2. Applying the Soap
Switch to your "soap" nozzle (usually the black one). Apply your cleaning solution from the bottom up. Why bottom to top? If you start at the top, the soapy water will run down the dry bricks below and create "clean streaks" that are surprisingly hard to even out later. Let the soap sit for about 10 to 15 minutes, but don't let it dry. If it starts to dry out, mist it with a little water.
3. The Final Rinse
Now it's time for the "pressure" part, but keep it reasonable. Swap in your 40-degree or 25-degree nozzle. This time, work from the top down. This way, you're always flushing the dirt and soap toward the ground. Keep the wand moving in a steady, sweeping motion. Try to keep the nozzle at least 12 to 18 inches away from the surface. If a stain isn't coming off, don't get closer; instead, try a second round of soap or a bit of manual scrubbing with a soft-bristle brush.
Dealing with Special Stains
Sometimes, you'll run into stuff that a standard detergent won't touch. * Efflorescence: That's the white, powdery salt that sometimes appears on brick. Believe it or not, water often makes this worse. Usually, a stiff brush and a little white vinegar do a better job than a pressure washer. * Mold and Mildew: If you have green or black spots, look for a cleaner specifically designed to kill spores. If you just blast them off with water, they'll be back in a month. * Rust: If you have rust stains from old shutters or gutters, you'll need an oxalic acid-based cleaner. Be careful with these, as they can be harsh on your skin and your lawn.
Should You Seal the Brick?
Once you're done pressure washing brick home surfaces and everything has dried (wait at least 48 hours), you might wonder if you should apply a sealer. This is a bit of a debated topic. On one hand, a breathable silane-siloxane sealer can help repel water and keep the brick cleaner for longer. On the other hand, if you use a non-breathable sealer, you might trap moisture inside the brick, which can lead to major damage when the temperature drops and that water freezes. Generally, if your brick is in good shape and the house is old, it's often best to let it breathe.
A Few Final Tips for Success
It's always a good idea to test a small, inconspicuous area first—like the spot behind the trash cans or near the foundation. This lets you see if your pressure is too high or if the chemical cleaner is going to discolor the brick.
Also, be mindful of the angle. Never spray directly upward into the bricks. Most brick homes have "weep holes" near the bottom to let moisture escape from behind the wall. If you spray upward, you can force gallons of water behind your brick veneer, which is a recipe for mold growth inside your wall studs and insulation. Keep the wand level or angled slightly downward.
At the end of the day, pressure washing brick home exteriors is about patience. It's not a race. If you take your time, use the right nozzles, and let the chemicals do the hard work, your house will look brand new without a single chip in the masonry. Just remember: if the mortar looks like it's struggling, put the wand down and call in a pro. Better safe than sorry when it comes to the literal foundation of your home!