Pressure Washing
What PSI to Pressure Wash Brick (1,500 to 2,500 PSI)
Quick answer
Brick takes 1,500 to 2,500 PSI and about 1.8 GPM with a 25 degree tip held 12 inches away. Start at the low end on older walls, because soft or crumbling mortar erodes quickly. At 1.8 GPM, 400 square feet of brick takes roughly 111 minutes.
Brick itself is hard. The mortar between the bricks is the weak point, and on an older house the mortar can be soft lime-based work that a modern pressure washer will hollow out in a single pass. That is why the guidance here is to start low, start far away and test where nobody will see it.
The cleaning rate for brick is the lowest of any masonry surface on this site at 2 square feet per minute for each GPM, because the texture holds dirt. Run your own area through the pressure washer PSI calculator before you plan the day.
On this page
What PSI do I need to clean brick?
| Setting | Brick |
|---|---|
| Pressure | 1,500 to 2,500 PSI |
| Minimum flow | 1.8 GPM |
| Nozzle | 25 degree |
| Distance from the surface | 12 in |
| Cleaning rate | About 2 sq ft per minute for each 1 GPM, the slowest surface on this site |
| Surface cleaner | No, not on vertical brick |
| Detergent | A masonry-safe cleaner for efflorescence, moss and mildew |
| Watch for | Soft or missing mortar, loose bricks and water driven into the wall cavity |
Older or soft mortar erodes easily. Start at the low end and at a distance, and test an inconspicuous spot before working across a visible wall.
Which nozzle should I use on brick?
| Tip | Color | Use on brick |
|---|---|---|
| 25 degree | Green | The standard tip for brick walls, walkways and steps. |
| 40 degree | White | Old or soft mortar, painted brick and the first pass on any wall you have not tested. |
| 65 degree or soap | Black | Applies masonry cleaner at low pressure so the chemistry handles moss and efflorescence. |
Skip the 15 degree tip on walls: it strips mortar joints faster than it cleans brick faces. The 0 degree tip has no place on masonry around a house.
How long does it take to pressure wash brick?
| Brick area | 1.2 GPM | 1.8 GPM | 2.4 GPM |
|---|---|---|---|
| 200 sq ft (chimney or porch) | 83 min | 56 min | 42 min |
| 400 sq ft (one wall) | 167 min | 111 min | 83 min |
| 600 sq ft (front elevation) | 250 min | 167 min | 125 min |
| 900 sq ft (two elevations) | 375 min | 250 min | 188 min |
Minutes = area divided by (GPM x 2 square feet per minute per GPM), the same formula the pressure washer PSI calculator uses. Heavy staining, mildew and detergent dwell time add to every figure, and a pass with detergent plus a rinse pass doubles the wand time.
How do I pressure wash brick without damaging mortar?
- Inspect the mortar joints first. Drag a key or screwdriver along a few joints. If mortar crumbles or falls out, the wall needs repointing before any pressure washing, not after.
- Test a hidden section. Pick a spot behind a downspout or under a porch. Wash a square foot at the low end of the range and look for sand washing out of the joints.
- Pre-wet the wall. Soaking the brick with plain water first keeps cleaner from being absorbed too deeply and makes rinsing easier.
- Apply cleaner bottom to top. A masonry-safe cleaner with dwell time handles moss, algae and efflorescence. Working upward avoids clean streaks in dirty brick.
- Rinse top to bottom at 12 inches. Use the 25 degree tip at a steady distance and keep the wand moving. Angle slightly downward near windows and doors so water is not forced into gaps.
Should you pressure wash old brick at all?
Sometimes the honest answer is no. Historic buildings with soft lime mortar and unfired or hand-formed brick can be damaged by pressure that a modern brick veneer shrugs off, and preservation guidance generally favors the gentlest method that works: water, a soft brush and time. If your mortar is sandy to the touch or joints are already recessed, get the wall repointed first and clean it by hand.
For modern brick veneer on a house built in the last few decades, the range above is safe with the tests described. A no-rinse product such as Wet & Forget Outdoor Cleaner Concentrate (128 oz.) suits shaded north walls where green growth, not dirt, is the problem. If the rest of your house is siding, see what PSI vinyl siding takes, and for flat masonry underfoot, pavers.
Which pressure washers work on brick?
Flow matters more than a big pressure number on a textured surface. Tiered picks are in the best pressure washers.
Greenworks 3000 PSI 2.0 GPM Brushless Electric Pressure Washer
$349.992.0 GPM clears the 1.8 GPM minimum, which is what keeps a slow surface from becoming an all-day job, and the brushless motor holds pressure steady through long sessions.
Best for: brick elevations and chimneys washed from the ground
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Champion 2800 PSI 2.1 GPM Low Profile Gas Pressure Washer
$499.992,800 PSI and 2.1 GPM from a 196cc engine with an Annovi Reverberi pump, in a low-profile frame that is easier to move along a wall than a tall cart.
Best for: larger brick homes and garden walls
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Kärcher K 5 Premium Electric Pressure Washer with Hose Reel
$386.01Vario Power lets you back the pressure off toward the low end of the brick range without swapping tips, which is what soft or patched mortar needs.
Best for: older houses with mixed mortar repairs
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RYOBI 2500 PSI 1.2 GPM Electric Pressure Washer
$327.912,500 PSI sits right at the top of the brick range, though the 1.2 GPM flow is below the 1.8 GPM guidance, so expect the times in the first column of the table above.
Best for: small brick areas such as steps and a porch
Check price on AmazonHow we chose
We did not test these products in person. Picks are researched from manufacturer specifications and owner manuals, engine and safety certifications where they apply, warranty terms, public recall records, and the recurring themes in verified owner reviews. We favor established brands with large review counts and parts support, match each pick to a real yard size or task, and place it in the tier where its price and capability actually belong.
Frequently asked questions
What PSI is safe for brick?
Between 1,500 and 2,500 PSI with a 25 degree tip about 12 inches from the wall, starting at the low end. Brick faces tolerate the upper end; mortar joints usually decide the limit. Older houses with soft lime mortar should be tested in a hidden spot first, and any wall with crumbling joints should be repointed before it is washed.
Can pressure washing damage mortar joints?
Yes, and it is the most common damage on brick. A narrow tip held close blasts sand out of the joint, leaving a recess that then collects water. Signs you have gone too far are sand running down the wall in the rinse water and joints that look freshly carved. Use the 25 or 40 degree tip, keep 12 inches of distance and keep the wand moving.
Why is brick slower to clean than concrete?
Texture. The site plans brick at about 2 square feet per minute for each GPM against 3 for concrete, because the mortar lines and the face texture hold dirt that a single pass does not reach. A 400 square foot wall at 1.8 GPM works out to roughly 111 minutes. Cleaner with dwell time cuts that more than extra pressure does.
How do I remove white powder from brick?
The white bloom is efflorescence, mineral salt carried to the surface as water moves through masonry and evaporates. Dry brushing removes light deposits, and a masonry cleaner made for efflorescence handles the rest. Because it is driven by moisture, deal with the source too: clogged gutters, splashback from a downspout or grade that pushes water at the wall.
Researched, not professional advice. This page is compiled from published specifications, manuals, labels and owner-review consensus, not hands-on testing. Follow the manufacturer's instructions and product label, and consult a qualified professional where safety, chemicals, fuel or structures are involved. As an Amazon Associate we earn from qualifying purchases.