Short answer: yes, if it’s done wrong. No, if it’s done right.

That’s the one-line version. The longer version matters more, because brick is one of the most common exterior materials on Bergen County homes — Saddle River, Ridgewood, Franklin Lakes, Glen Rock, and pretty much every older neighborhood in northern Jersey has brick walkways, brick steps, brick chimneys, and brick facades. Knowing whether power washing damages brick — and when it does and doesn’t — is the difference between a fresh-looking exterior and a $30,000 repointing job.

Here’s what every homeowner should know before pointing a pressure wand at their bricks.

What Power Washing Does to Brick

A standard residential power washer puts out 2,500 to 4,000 PSI. That’s enough force to peel old paint, rip up loose mortar, and yes — strip the face of softer brick if you hold the nozzle close enough.

The damage isn’t usually dramatic. It’s slow. Each aggressive cleaning takes a thin layer off the brick face. Fired brick has a hard outer skin (the “fire skin”) that’s far more weather-resistant than the softer body underneath. Once that skin is sandblasted off, the inner brick absorbs water like a sponge — and water plus freeze-thaw cycles in a New Jersey winter is what cracks brick from the inside.

The Brick Industry Association’s published technical notes on cleaning brickwork (you can read them at gobrick.com) make this point clearly: high-pressure cleaning is one of the most common sources of premature brick deterioration on residential homes.

When Power Washing Brick Is Safe

Modern, well-fired clay brick under 50 years old, with sound mortar joints, generally tolerates power washing at the right settings. “Right settings” means:

• Pressure capped at 1,000 to 1,500 PSI for brick — well below the residential power washer’s max
• A 25-degree (green) or 40-degree (white) tip — never a 0-degree or 15-degree concentrated stream
• Held 12 to 18 inches from the surface — close enough to clean, far enough to avoid etching
• Soap applied first, allowed to dwell, then rinsed — chemistry does the work, not raw pressure

Done at those settings, power washing removes algae, mildew, dirt, pollen, and surface staining without taking the fire skin with it. Walkways, patios, and chimneys cleaned this way come back looking new.

For a deeper read on softer cleaning methods, see our note on the soft wash approach we use for roofs and delicate surfaces — the same principle applies to older brick.

When Power Washing Brick Damages It

Five conditions where standard power washing is the wrong move:

1. Older Brick (Pre-1930s)

Many Bergen County homes — especially in Saddle River, Ridgewood, and the older Englewood and Tenafly streets — have hand-fired brick that’s much softer than modern brick. The fire skin is thinner and the body below it is more porous. High-PSI cleaning pulls material off in a way you can’t see until the next freeze-thaw cycle starts cracking pieces loose. We treat this brick with a soft wash detergent system instead.

2. Crumbling or Cracked Mortar

If you can scratch the mortar between bricks with a key, it’s already deteriorated. Power washing will blow it out. The wand pushes water deep into the wall cavity, behind the brick face, and once water gets behind brick it doesn’t easily come back out. That’s the start of efflorescence (white salt staining), spalling (face popping off), and full-on repointing work.

3. Painted Brick

If the brick is painted, power washing can lift paint flakes and embed them into the brick pores. Cleaning painted brick well requires soap, hand work, and patience — not a 3,500 PSI wand.

4. Brick With Existing Spalling

Spalled brick (where the face has popped off, leaving a softer interior exposed) is already damaged. Power washing accelerates the failure. Repointing or selective replacement comes first; cleaning comes after.

5. Brick Walls Near Windows

Pressure forced into mortar joints around windows finds its way inside. We’ve seen perfectly good interior drywall ruined by exterior brick washing done too aggressively. Brightness uses lower pressure and tighter masking around windows for this reason — see our residential power washing service page for how we set up these jobs.

Soft Wash vs Power Wash on Brick

Most professional cleaners now treat older or delicate brick with soft washing — a low-pressure, chemistry-driven method that uses biodegradable detergent (typically a sodium hypochlorite blend), surfactants, and a rinse at garden-hose pressure or below.

Soft wash:

• Kills algae, mildew, and mold at the root (so it doesn’t grow back as fast)
• Won’t strip the fire skin
• Doesn’t push water into mortar joints
• Takes a bit longer per square foot, but holds the result for 2 to 3x as long

Power wash on solid, modern brick at correct settings:

• Faster on heavy dirt and surface staining
• Cleaner immediate finish on driveways, patios, walkways
• Best when paired with soap, not used as raw pressure

The right answer for your specific Bergen County brick is usually a hybrid — soft wash on facades and chimneys, controlled power wash on walkways and driveways.

What to Ask Before Hiring Anyone

Three questions separate a careful contractor from a problem one:

1. What PSI will you use on the brick? The right answer is somewhere under 1,500 PSI on the brick face, full pressure on a hard-surface walkway only.
2. What tip and distance? A green or white tip held a foot back is the safe answer. A red (0-degree) tip on brick is a red flag.
3. What chemistry? A real answer mentions a low-strength bleach or detergent blend with surfactant. “Just water” usually means they’re going to use raw pressure to make up for it — and that’s where damage starts.

For historic homes specifically, the National Park Service Preservation Briefs on cleaning historic masonry are the gold standard. If you own a pre-1900s brick home in Saddle River or one of the older Bergen towns, read them before any contractor touches the building. We do.

The Bergen County Climate Factor

Northern New Jersey gets roughly 30 to 50 freeze-thaw cycles per winter. Every cycle is a small expansion-contraction event that hunts for any crack or saturated area in your masonry. A power wash done in late fall, where water gets pushed into mortar and freezes a week later, can do more damage in one winter than a decade of dirt would.

We schedule brick cleaning between mid-spring and early fall for exactly this reason. A clean wall going into a New Jersey winter is much safer than a wet one.

When You Should Just Call Someone

If you’re looking at any of these, hire a professional rather than DIY:

• Brick chimneys above the first floor (height plus delicate flashing risk)
• Pre-1950s brick anywhere
• Brick around windows, doors, or HVAC penetrations
• Painted brick
• Brick with visible mortar deterioration
• Tall multi-story facades (especially in Saddle River and other towns with older estate homes)

For commercial brick work — storefronts, mixed-use buildings, multifamily — see our commercial power washing service page; the prep and chemistry are different than residential.

The Short Version

Power washing damages brick when the pressure is too high, the brick is too old or too soft, the mortar is failing, or the technique is wrong. It doesn’t damage brick when the PSI is capped at 1,500 or below, the tip is wide-angle, the wand is held a foot back, and detergent is doing most of the actual cleaning.

If you’re not sure which category your house falls into — old brick, soft mortar, painted, or otherwise — get a free quote from Brightness before turning on a pressure washer. We’ll tell you whether it should be power washed, soft washed, or left alone entirely. You can also learn more about us and our service area at brightnesswindowcleaning.com.