How to power wash a brick house with a pressure washer

November 17, 2025

BISON Santy

Hello, I am Santy, the funder of bisonclean.com. I have been in cleaning machinery field for more than 5 years now, and the purpose of this article is to share with you the knowledge related to pressure washer from a Chinese supplier's perspective.

Power washing is one of the most effective ways to restore the beauty of a brick house, removing years of dirt, grime, mildew, and other buildup. A clean, well-maintained brick exterior not only improves curb appeal but also helps protect the surface from long-term damage caused by mold or algae. This simple yet powerful cleaning method can make your house look fresher and more inviting almost instantly.

A brick house is durable but can accumulate dirt and algae over time. A day of power washing can remove grime and tough stains, but it must be done carefully. Too much pressure or the wrong technique can damage the mortar, strip away paint, or weaken the brick surface. Using the right equipment and following proper procedures ensures safe and effective cleaning.

In this blog, BISON will walk you through the step-by-step process of power washing a brick house correctly so that you can enjoy a spotless, refreshed exterior. Whether you’re maintaining your home or preparing it for sale, power washing, when done properly, is a game-changer for any brick house.

Understanding the basics of power washing brick houses

A pressure washer sprays water at high velocity through a nozzle, powered by either an electric motor or a gas engine. The pressurized water creates a strong stream capable of lifting dirt, grime, and debris from surfaces.

Should you power wash a brick house?

Yes, brick is a common material for both residential and commercial buildings because it is durable and visually appealing. However, like any building material, bricks require regular cleaning and maintenance to ensure longevity. Pressure washing is a popular method for cleaning brick, but it must be done correctly to avoid damaging the brick or mortar.

Types of pressure washers: Gas vs. electric

Gas pressure washers:

More powerful, with higher psi and gpm ratings, ideal for large or heavily soiled areas.
Can easily clean an entire brick house, including tough stains and higher areas.
Bulkier, louder, and requires more maintenance.

Electric pressure washers:

Quieter, lighter, and easier to maintain.
Lower psi and gpm, suitable for light cleaning or small areas.
Ideal for smaller homes or maintenance cleaning where heavy power isn’t required.

Understanding PSI and GPM

PSI (pounds per square inch): measures water pressure. Higher psi increases cleaning force but can damage mortar or brick if too strong.
GPM (gallons per minute): measures water flow. Higher gpm allows faster cleaning, but excessive flow is unnecessary.

Recommended settings for brick house

PSI: 2000–3000, providing enough power to clean without damaging mortar.
GPM: 2–4, enough to clean efficiently without wasting water.

Setting the stage for washing the brick with a pressure washer

1. Prioritize safety precautions

Read the manual: Understand your machine, spray patterns, and settings, especially if using detergent.
Wear protective gear: Goggles, rubber gloves, non-slip shoes, and hearing protection for gas-powered washers. Stand on a stable surface.
Avoid loose clothing: Fitted clothing reduces the risk of snagging on equipment.

2. Gather equipment and supplies

Pressure washer: Adjustable psi (1,500–2,500) is ideal for most brick surfaces.
Extension wand: Helps reach high or difficult areas without straining.
Soft bristle brush: Loosens stubborn grime before or after washing.
Hose and nozzle attachments: Use a 25–40° tip for delicate cleaning.

3. Pre-inspect the brick surface

Check for damage: Look for cracks, chips, or loose mortar. Repair damaged areas before pressure washing.
Test a small area: Ensure the brick can handle the water pressure without damage.

4. Prepare the cleaning area

Clear the space: Remove furniture, decorations, and obstacles. Cover immovable items with tarps or drop cloths.
Set a safe work area: Keep pets and children away.
Protect landscaping: Cover nearby plants with plastic sheeting and trim any greenery touching the brick.

5. Select the right cleaning solution

For general dirt and grime, a masonry-safe detergent is sufficient.
For mildew or mold, use a mildew remover designed for brick.
For oil or grease stains, select a degreaser.

Consider brick type: Traditional clay bricks and sand-lime bricks may respond differently to cleaners. A natural option is equal parts water and vinegar.

Mix as directed: Follow manufacturer instructions for dilution. Use built-in detergent tanks if available for easier application.

How to power wash a brick house with a pressure washer

Step 1: Wet the brick surface

Pre-wet the bricks with a garden hose or the pressure washer on its lowest psi. Saturate the area from top to bottom.

Wetting reduces brick porosity, preventing detergent from soaking too deeply. It also makes dirt easier to lift and protects the brickwork.

Step 2: Apply the detergent evenly

Use the pressure washer or a sprayer to apply detergent evenly, starting at the bottom and working upward.

Let the solution sit for 5–10 minutes, but avoid letting it dry.

Avoid spraying directly onto windows, vents, doors, or decorative strips during the process.

Use a soft-bristle brush to gently scrub persistent spots before rinsing.

Step 3: Remove the cleaning solution

Turn off the detergent supply once applied

Set the pressure washer to a safe spray pattern and rinse the bricks to flush away the cleaning solution.

Start with a low-pressure setting of 500 PSI when washing a brick house. You can work your way up from there, although it’s generally best not to go over 2000 PSI.

Too high pressure can damage bricks, mortar, or allow water to penetrate the wall.

Start at the bottom and work upwards

Starting at the bottom prevents streaking and ensures that debris running down is cleaned as you go.

keep the wand at 45 degrees to avoid damaging the bricks while ensuring effective cleaning. Hold the wand 6–8 inches from the brick surface.

Overlap each stroke

Slightly overlap each stroke for even cleaning, moving the wand in long, steady motions.

Maintain consistent pressure

Move the wand at a steady pace. Too fast leaves dirt behind; too slow can damage the brick or mortar.

Avoid staying in one spot too long

Keep the wand moving to prevent high-pressure water from eroding mortar or surface layers.

Post-power washing care

Inspect for missed spots: Once the bricks are dry, check for any areas that may still have dirt or tough stains.
Secondary washing: Heavily soiled areas may need a second pass. If so, use a lower pressure setting to avoid damaging the brick or mortar.
Rinse the surrounding area: Flush the area around your house with clean water to dilute any soap residue.
Remove protective coverings: Carefully take down plastic sheeting or painter’s tape from windows, plants, and other surfaces to avoid damage.
Dispose of cleaning solutions properly: Follow local guidelines for safe disposal of any leftover cleaning products to protect the environment.
Store equipment: Clean and dry your pressure washer and accessories, then store them in a safe, dry place to maintain their condition for future use.

Conclusion

Power washing is an effective way to keep your brick house clean, fresh, and well-maintained. By using the right techniques, pressure settings, and cleaning solutions, you can safely remove dirt, stains, and contaminants without damaging the brick or mortar. For those who are unsure or lack the proper tools, hiring a professional pressure washing service ensures a thorough and safe cleaning. With proper care, your brick exterior can maintain its beauty and enhance your home’s curb appeal for years to come.

For durable, high-quality pressure washer equipment and accessories for your next project, start a business partnership with BISON today and explore our comprehensive range of reliable and efficient equipment.

As a leading pressure washer supplier, BISON has a complete pressure washer production line, allowing you to customize your specific product details at any stage, with professional mechanical experts providing guidance throughout the process. BISON also offers reliable after-sales service and timely technical support.

FAQs About power wash a brick house

How often should I power wash my brick house?

A brick house should generally be pressure washed every one to two years, depending on dirt, algae buildup, and environmental conditions.

Should I use hot or cold water to power wash the brick house?

Both hot water pressure washer and cold water pressure washer can be used, but hot water is more effective for stubborn stains such as oil or grease.

Can muriatic acid be used to clean brick houses?

No. Muriatic acid and harsh chemicals can damage bricks and mortar, allowing water to penetrate and weaken the structure. Even if bricks are extremely dirty, avoid acids, ammonia, or drain cleaners, as they can strip paint and finishes, leaving an uneven surface.