Brick looks tough, but pressure washing it the wrong way is one of the fastest paths to expensive, hard-to-reverse damage. The mortar between bricks is softer than the bricks themselves -- and once it's eroded, water infiltrates the wall, mold follows, and you're staring at a repointing bill that dwarfs the cleaning job. Here's how to clean brick and masonry safely.

The Quick Answer

Brick needs lower pressure than most surfaces, plus the right nozzle and detergent. Here's the short version:

PSI range: 600-800 PSI for standard brick, 500-600 PSI for older or historic brick
Never exceed: 1,500 PSI on any brick or masonry surface
Nozzle: 25- to 40-degree tip, always angled downward -- never straight into joints
Detergent: Required -- let it break up the dirt so the pressure doesn't have to
Mortar prep: Patch cracked joints at least 7 days before cleaning so they fully cure

The core principle: use less pressure than you think you need. Detergent does the heavy lifting. Pressure just rinses it off.

Why Brick Is More Fragile Than It Looks

Modern brick has a hard outer layer called the fire skin. Older brick -- anything pre-1950 -- often doesn't. Once you strip that outer layer with too much pressure, you expose the soft, porous interior to moisture, freeze-thaw cycles, and long-term deterioration.

The mortar between bricks is the other vulnerability. It's softer than the brick itself, and high-pressure water aimed directly at joints can erode it in a single pass. That gap isn't just cosmetic -- it creates a path for water to get behind the wall, leading to mold, structural damage, and repointing costs of $5-$25 per linear foot. On a large brick home, you're talking thousands in repairs from one bad cleaning job.

Before you turn on the machine, understand what you're working with and price accordingly. Brick is a specialty service -- not a standard house wash.

Prep: What to Do Before You Start

Walk the surface first. Look for:

Cracked or missing mortar joints -- these must be repaired before any cleaning
Spalling bricks (flaking or crumbling face) -- high pressure will make this significantly worse
Efflorescence (white mineral staining) -- requires a chemical treatment, not just pressure
Rust, paint, or oil staining -- each needs a different pre-treatment product

Patch any damaged mortar at least 7 days before the job so it fully cures. Repointing and immediately washing is a mistake -- freshly applied mortar washes right out. Once repairs are set, pre-wet the brick with plain water before applying detergent. This prevents the cleaner from soaking too deep into porous material.

PSI and Nozzle Guide for Different Brick Types

Standard Brick (post-1950)

Use 600-800 PSI with a 25- or 40-degree nozzle. This is enough to cut through surface dirt, algae, and mild staining without threatening mortar joints. Keep the nozzle 12-18 inches from the surface and angle it slightly downward -- never spray upward or point directly into joints at close range.

Older or Historic Brick (pre-1950)

Drop to 500-600 PSI max and test a small, hidden section first. Some older brick can't tolerate any pressure washing at all and needs chemical cleaning with a soft brush only. When in doubt, go lower. The cost of re-facing historic brick is far higher than any cleaning job is worth.

Brick Pavers and Patios

Ground-level pavers are more durable and can typically handle up to 1,000 PSI. Still use a wide-angle nozzle and keep consistent distance to avoid uneven cleaning patterns.

Step-by-Step Cleaning Process

Repair mortar. Fix any cracked or missing joints 7+ days before the job.
Pre-wet the surface. Saturate the brick with plain water to reduce detergent absorption into pores.
Apply masonry cleaner. Use a brick-specific detergent or diluted TSP. Let it dwell 5-10 minutes. Don't let it dry on the surface.
Wash top to bottom. Start at the top and work down so dirty water doesn't run over cleaned areas. Keep the wand moving -- never stop in one spot.
Angle the nozzle down. Spraying upward drives water behind bricks and into wall cavities. Aim at a slight downward angle, never directly into mortar joints.
Rinse completely. All detergent residue must come off. Leftover cleaner causes streaking and can damage brick over time.

Pricing Brick and Masonry Jobs

Brick cleaning takes more time and care than a standard vinyl siding wash. Price it to reflect that. Here are typical 2026 rates:

Brick house exterior: $200-$600 depending on size and condition
Brick patio or pathway: $0.20-$0.40 per sq ft, minimum $150
Brick retaining wall: $1.00-$2.50 per linear foot
Efflorescence treatment: Add $50-$100 for chemical treatment on heavily affected surfaces
Historic brick surcharge: Add 25-50% for pre-1950 structures requiring extra care and lower pressure

Always include a written scope clause that covers damage documented during the pre-cleaning inspection. If the mortar has been eroding for years, put that in writing before you start. You don't want to be blamed for damage you didn't cause.

The Upsell: Mortar Repair and Full Restoration

Most brick surfaces you'll clean have at least some mortar damage. You can't do the repointing yourself unless you're a mason, but you can build a referral relationship with a masonry contractor and pass the work. That relationship pays both ways.

A better approach: offer a written condition report as part of your brick cleaning service. Document what you found during the pre-cleaning inspection -- cracked joints, spalling, efflorescence, any areas of concern. Customers appreciate the thoroughness, it protects you legally, and it opens the conversation about restoration beyond just cleaning.

Brick cleaning is often a gateway to full exterior restoration projects on older homes worth $2,000-$10,000 or more. Position yourself as the expert who spots problems early, and you'll get referrals that go well beyond pressure washing.

Bottom Line

Pressure washing brick and masonry pays more than standard jobs because it requires more skill and care. The difference between a clean brick wall and a damaged one comes down to pressure -- stay under 800 PSI, angle your nozzle down, and let detergent do the heavy lifting. If you want customers to get instant pricing for brick cleaning before they ever pick up the phone, try QuoteSnap for free. It puts live pricing on your website so you capture leads before your competitors even see the message.

Cleaning Brick and Masonry: Pressure Washing Without Damaging Mortar