Picture this: a classic brick house, its weathered red and earthy tones muted under a stubborn layer of grime, moss creeping into the mortar like an unwelcome guest. You’ve likely wondered if a power washer—the modern-day cleaning powerhouse—could blast away years of dirt to reveal the home’s original beauty. But with all that power comes a twinge of doubt: could this high-pressure jet of water harm the very bricks it’s meant to revive?
The answer lies in the details. Power washing can breathe new life into a brick house, uncovering vibrant tones hidden beneath the dirt. Yet, without the proper approach, it could just as easily erode mortar, chip bricks, or force water into places it doesn’t belong.
In this guide, we’ll walk you through everything you need to know to ensure that power washing not only cleans but protects your brick house for years to come. Let’s dive in and uncover the secrets of safe, effective cleaning!
Table of Contents
Is It Safe to Power Wash a Brick House?
Power washing a brick house can be safe, but like any powerful tool, it demands the right approach. Bricks may seem tough and impenetrable, but their porous nature and the mortar holding them together can be surprisingly fragile under intense water pressure.
The good news? With the right technique and tools, power washing a brick house is not only safe but also highly effective at restoring its beauty. Here’s a step-by-step guide to ensure a damage-free cleaning experience.

Best Practices for Power Washing a Brick House
Inspect the Brickwork
Before you start, thoroughly inspect the bricks and mortar for any signs of damage, such as loose, crumbling, or cracked mortar and bricks. These weak spots can worsen under high pressure. Repair any issues before power washing to maintain the structural integrity of your home. Think of this as preparing the foundation before painting a wall—without a solid base, everything else can fall apart.
Start with a Low Pressure Setting
Using the right pressure is crucial to avoid damaging your brickwork. A washer rated between 800–1,200 PSI provides enough force to remove dirt, mold, and grime without eroding the mortar or chipping the bricks. Avoid exceeding 2,000 PSI, as it may compromise older or weaker bricks. Begin with the lowest pressure setting and gradually increase if needed. It’s always better to err on the side of caution.
Right Nozzle, Distance & Angle
To safely power wash brick, use a 25° or 40° nozzle for a wide, gentle spray that won’t damage mortar or bricks. Keep the nozzle 12–24 inches away—close enough to clean effectively but far enough to avoid erosion. Hold the spray gun at a 45° angle and work from top to bottom, allowing water and debris to flow away naturally while protecting the brick’s structure.
Test a Small Area First
Before diving into the entire wall, test your settings on a hidden section of the brickwork. Always test your equipment and technique on a hidden section of the wall. This ensures your settings and detergent won’t damage the bricks or mortar. It’s like tasting soup before serving—better safe than sorry.
Bonus Tip:
If the test area shows no signs of erosion or discoloration, proceed with confidence. If it does, adjust your settings or consider a softer cleaning method.
Pre-Treat Stains with Detergent
For bricks with mildew, grease, or deep stains, pre-treating with a brick-safe detergent can make all the difference. Apply the detergent using a low-pressure nozzle and let it sit for 5–10 minutes to break down tough grime. Avoid letting it dry out, as this can create streaks.
Expert Advice:
Choose biodegradable detergents designed specifically for brick to ensure safety for both your home and the environment.
Work in Sections
Divide the wall into manageable sections and clean one area at a time. Position your spray gun at a 45° angle and work from the top of the wall downward. This approach prevents water from being forced into mortar joints and helps dirt flow away naturally. Use overlapping strokes for consistent coverage and even results. This ensures even coverage and prevents detergent from drying before rinsing.
Rinse Thoroughly
Once you’ve cleaned a section, switch to plain water and rinse thoroughly to remove all detergent and loosened debris. Residual soap can leave streaks or weaken the mortar if not completely washed away. Pay extra attention to mortar joints and corners to ensure no residue lingers, leaving your bricks spotless and even in appearance.
Allow the Bricks to Dry
Allow the bricks to air dry completely before inspecting your work or applying any sealant. This step ensures no lingering moisture, which could lead to mold or frost damage. For best results, choose a sunny, breezy day to speed up drying time, and avoid cleaning in cold or humid weather where moisture might persist.
By following these steps, you’re not just cleaning your brick house—you’re protecting it. Each step builds on the last to ensure a thorough yet safe cleaning process. Now here comes the good part: With these best practices, you’ll achieve professional-level results without risking your home’s beauty or structure. Ready to make your brick house shine? Let’s get started!
The Risks of Power Washing Brick
Power washing can be a transformative way to clean your brick house, but it’s not without its risks. Bricks may seem indestructible, but improper technique can turn a simple cleaning task into a costly repair project. Understanding these risks will help you avoid damage while achieving professional-level results.
Damage to Mortar Joints
Mortar is the glue that holds your bricks together, but it’s far less durable than the bricks themselves. High-pressure water can erode or completely dislodge mortar, especially if it’s already aging or crumbling. Missing mortar not only weakens the structure but also creates gaps for moisture to seep in.
Cracking or Chipping Bricks
Older bricks or bricks that have been exposed to harsh weather conditions can become brittle. A high-pressure stream, especially from a narrow nozzle, can cause cracks or even chip pieces off. Once damaged, bricks lose their ability to withstand moisture and temperature changes, leading to further deterioration.
Water Seepage
Bricks are naturally porous, and if water is forced into these pores, it can become trapped. Over time, this trapped moisture can lead to mold, mildew, or frost damage in colder climates. Seepage is especially problematic when power washing is done incorrectly, such as spraying directly at mortar joints or using too much pressure.
Stripping Paint or Coatings
If your bricks are painted or sealed, power washing can strip these coatings unevenly, leaving your home looking patchy. This is especially common when using high-pressure settings or the wrong nozzle. While this might be intentional if you’re removing paint, it’s a problem if you’re trying to preserve the finish.
Creating Uneven Surfaces
Power washing can create uneven surfaces on brickwork if too much pressure is applied to certain areas. This is not only unsightly but can also weaken the surface, making it more prone to collecting dirt or moisture in the future. Scrubbing too hard on one area of fabric wears it down faster, and bricks are no different. Consistency is key.
How to Avoid These Risks
The risks of power washing brick don’t mean you should avoid the task altogether; they mean you should approach it with care. Here’s how:
- Use a low-pressure setting (800–1,500 PSI) to clean without damaging mortar or bricks.
- Select a 25° or 40° nozzle to ensure a gentle, even spray.
- Keep the nozzle 12–24 inches from the surface to maintain safe pressure levels.
- Spray at a 45° angle and work from the top down to prevent water from forcing into joints.
When to Avoid Power Washing Brick
Power washing brick can be a powerful way to clean, but there are situations where it’s better to hold off or opt for alternative methods. Knowing when to avoid power washing is as important as knowing how to do it safely. Here are some clear-cut scenarios to keep in mind:

When the Brickwork is Old or Fragile
Older bricks, especially those on historic homes, can become brittle over time. High-pressure water can cause them to crack, chip, or flake. If the mortar is already deteriorating, power washing can make things worse by dislodging it entirely.
If Mortar Joints Are Damaged
Crumbling or loose mortar can’t withstand the force of a power washer. Spraying directly on damaged joints can wash away what’s left, compromising the stability of the entire structure. Repair the mortar first and let it cure before attempting to power wash.
On Painted or Sealed Bricks (Unless Removing Coating)
Power washing can strip paint or sealant from brick surfaces. If your goal is to keep the paint intact, the high pressure could leave the finish uneven or peel it off entirely.
When It’s Okay: If you’re intentionally removing old paint or sealant, a power washer can be effective, but use it with caution to avoid uneven results.
During Freezing or Wet Conditions
Brick is porous and can absorb water during power washing. In freezing temperatures, this trapped water can expand, causing cracks and long-term damage. Similarly, humid or wet weather slows drying and creates conditions for mold or mildew growth.
Best Practice: Always power wash bricks on a dry, warm day with no chance of freezing temperatures.
When You Lack the Proper Equipment or Experience
Using the wrong pressure settings, nozzle, or technique can lead to serious damage. If you’re unsure of the correct methods, it’s easy to unintentionally erode mortar, chip bricks, or cause water seepage.
Smart Choice: When in doubt, hire a professional to ensure your brickwork is cleaned safely and effectively.
Why Avoiding These Situations Matters
Power washing is a tool—not a one-size-fits-all solution. Ignoring these red flags can turn a straightforward cleaning job into costly repairs. By recognizing when to avoid power washing brick, you protect your home and ensure its beauty and longevity.
Now here comes the good part: If you’re ever unsure, consider consulting with professionals who can evaluate your brick’s condition and recommend the safest cleaning method for the job.
Tips for Maintaining a Brick House
Brick homes are known for their durability and timeless charm, but they still require proper care to remain in good condition. To help you maintain your brick house, here are practical tips that go beyond routine cleaning and cover valuable insights often overlooked:

Regularly Inspect for Vegetation Growth
Moss, ivy, or climbing plants may look picturesque, but they can trap moisture against the brick and mortar, leading to long-term damage. Over time, roots and vines can work their way into cracks, widening them and compromising the structure.
What to Do: Trim back or remove vegetation regularly. If ivy or other plants have attached to your bricks, gently remove them and check for damage underneath.
Address Efflorescence Promptly
Efflorescence appears as a white, powdery residue on brick surfaces and is caused by salts leaching out when moisture evaporates. While not harmful initially, it indicates moisture penetration that could lead to bigger problems.
Solution: Use a stiff brush and water to clean it off, or consider applying a sealant if the issue persists. Investigate the source of moisture to prevent recurrence.
Check and Maintain Gutters and Downspouts
Poor drainage is a leading cause of moisture-related issues in brick homes. Water spilling from clogged gutters or misaligned downspouts can seep into the bricks and mortar, causing damage over time.
Maintenance Tip: Clean gutters at least twice a year and ensure downspouts direct water at least five feet away from your home’s foundation.
Seal Cracks and Gaps Early
Small cracks in bricks or mortar may seem harmless but can allow water to penetrate, freeze, and expand, leading to bigger problems during freeze-thaw cycles.
Proactive Fix: Inspect your brickwork seasonally and seal any cracks with a brick-specific sealant or repair mortar. Address these issues before they grow.
Protect Brick from Heavy Impacts
Unlike some materials, brick is not immune to damage from heavy impacts, such as lawn equipment, hail, or sports activities.
Prevention Tip: Create a buffer zone near the walls by planting shrubs or using decorative fencing. Keep outdoor equipment stored safely away from your brick exterior.
Ensure Proper Ventilation
Poor ventilation inside your home can lead to condensation on brick walls, especially in basements or attics. Over time, this moisture can seep into the structure and weaken it.
How to Prevent: Use dehumidifiers in humid spaces and ensure attic vents are not blocked. Regularly check areas where brick meets other materials, like windows or roofing, for proper seals.
Apply a Breathable Brick Sealant
While we’ve discussed sealants, it’s important to emphasize the use of breathable sealants specifically. These allow moisture trapped inside the brick to escape while still preventing water from entering. Non-breathable sealants can cause more harm than good by trapping moisture inside.
When to Apply: Every 5–10 years or after significant restoration work.
Why These Tips Matter
Maintaining a brick house isn’t just about keeping it clean—it’s about preserving its strength and beauty for decades. By addressing common issues like moisture, cracks, and vegetation early, you’ll save money on repairs and ensure your brick home remains a source of pride.
Conclusion
Power washing a brick house can be a game-changer for maintaining its charm and longevity, but it requires the right techniques and careful attention to avoid damage. By following the best practices and taking precautions, you can safely clean your home while protecting its structure and appearance.
If the task feels daunting or you’re unsure about tackling it yourself, calling in professionals is always a smart choice. With expert care, you can achieve a spotless, refreshed look without the worry of mistakes.
Ready to make your brick house shine? Contact us today for professional brick house cleaning services that combine safety, efficiency, and stunning results. Let us help you protect your home while keeping it picture-perfect!
FAQs
Can I use detergent on bricks?
Yes, but always use a brick-safe cleaner designed for porous surfaces. Harsh chemicals can damage bricks and mortar, so stick to gentle formulas that remove dirt and grime without harming the structure.
How often should I power wash my brick house?
Power washing once a year is usually enough to maintain a clean appearance. Over-cleaning can wear down mortar and bricks, so only clean when necessary, such as after visible dirt, grime, or mildew buildup.
Should I seal my bricks after power washing?
Yes, sealing bricks after power washing adds a protective barrier against moisture and stains. This step extends the lifespan of your brickwork and prevents issues like efflorescence and mold.
What if I have painted bricks?
For painted bricks, use low pressure to avoid peeling or chipping unless you’re intentionally removing the paint. If preserving the paint is important, consider gentler cleaning methods like soft washing or manual scrubbing.