Pressure Washing
What PSI to Pressure Wash Stucco (1,200 to 1,500 PSI)
Quick answer
Stucco takes 1,200 to 1,500 PSI and about 1.5 GPM with a 40 degree tip held 18 to 24 inches away. Many professionals prefer soft washing instead, because stucco is porous and cracks take on water. Repair cracks first. A 1,500 square foot wall is roughly 333 minutes at 1.5 GPM.
Stucco looks like masonry and behaves like a sponge. It is porous by design, and any crack, no matter how fine, is a path for water into the wall assembly behind it. Add that most stucco is textured, so dirt sits in the texture rather than on top of it, and you get a surface that punishes both high pressure and impatience.
The safest approach is detergent plus dwell time at low pressure, which is what soft washing means. Estimate your wall area and time in the pressure washer PSI calculator.
On this page
What PSI do I need to clean stucco?
| Setting | Stucco |
|---|---|
| Pressure | 1,200 to 1,500 PSI |
| Minimum flow | 1.5 GPM |
| Nozzle | 40 degree |
| Distance from the surface | 18 to 24 in, the greatest distance of any surface here |
| Cleaning rate | About 3 sq ft per minute for each 1 GPM |
| Surface cleaner | No |
| Before you start | Repair cracks and let repairs cure |
| Watch for | Water driven into cracks, chipped texture and blown-out control joints |
Stucco is porous and cracks can take on water. Many professionals prefer soft washing with a cleaner and low pressure. Repair cracks first.
Which nozzle should I use on stucco?
| Tip | Color | Use on stucco |
|---|---|---|
| 40 degree | White | The only tip for stucco, held 18 to 24 inches back and kept moving. |
| 65 degree or soap | Black | Applies cleaner at low pressure, which is where most of the work happens on a textured wall. |
Anything narrower chips the texture, opens hairline cracks and drives water into the wall. The 0 and 15 degree tips are never used on stucco, and neither is a wand held closer than about 18 inches.
How long does it take to wash stucco?
| Wall area | 1.2 GPM | 1.5 GPM | 2.0 GPM |
|---|---|---|---|
| 1,000 sq ft (small ranch) | 278 min | 222 min | 167 min |
| 1,500 sq ft (large ranch) | 417 min | 333 min | 250 min |
| 2,000 sq ft (two story) | 556 min | 444 min | 333 min |
| 2,800 sq ft (large two story) | 778 min | 622 min | 467 min |
Minutes = area divided by (GPM x 3 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 clean stucco step by step?
- Walk the walls and mark cracks. Look along the wall at a low angle in good light. Mark every crack, especially around windows, doors and control joints.
- Repair and let it cure. Patch cracks with a compatible stucco repair product and give it the cure time on the label before any water touches it.
- Protect openings and plants. Close windows, cover exterior outlets and light fixtures, and soak beds and shrubs with plain water first.
- Apply cleaner bottom to top. Use the soap tip and work upward. On a porous, textured wall the cleaner and its dwell time do most of the cleaning.
- Rinse top to bottom at 18 to 24 inches. Fit the 40 degree tip, keep the greatest distance of any surface on this site, and hold the spray level or angled slightly down.
- Watch for dark patches afterward. A spot that stays dark long after the rest has dried is holding water. That is a crack or a flashing issue to look at, not something to wash harder.
Is soft washing better for stucco?
For most homes, yes. Soft washing uses a cleaning solution at low pressure and lets chemistry handle the algae, mildew and grime in the texture. On stucco the advantage is direct: less water forced into a porous wall, no chipped texture and no risk of opening a hairline crack into a real one. The trade-off is dwell time and usually more product.
A no-rinse cleaner such as Wet & Forget Outdoor Cleaner Concentrate (128 oz.) suits shaded elevations where green growth is the whole problem. Where a rinse is needed, a machine with flow rather than pressure is the right shape of tool. The gentler cousin of this page is vinyl siding, and the harder one is brick. The general method for washing a house from the ground is in how to pressure wash a house.
Which pressure washers suit stucco?
Low pressure, adjustable, with enough flow to rinse a textured wall. Options are in the best electric pressure washers.
Kärcher K 5 Premium Electric Pressure Washer with Hose Reel
$386.01Vario Power adjusts pressure by twisting the lance, so you can sit at the low end for stucco and step up for the concrete path below it without changing tips.
Best for: stucco homes where one machine does everything
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Greenworks 3000 PSI 2.0 GPM Brushless Electric Pressure Washer
$349.992.0 GPM clears the 1.5 GPM stucco minimum, which is what shortens a big wall. Pressure at the surface is managed with the 40 degree tip at 18 to 24 inches.
Best for: two story stucco walls washed from the ground
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Sun Joe SPX3000 Electric Pressure Washer
$169.00Two detergent tanks keep house wash loaded for a soft wash approach, and the 40 degree and soap tips are the only two this surface needs.
Best for: single story stucco and occasional cleaning
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Wet & Forget Outdoor Cleaner Concentrate (128 oz.)
$34.99A no-rinse concentrate for green and black growth, which on a porous wall is often the better answer than any amount of water pressure.
Best for: shaded north-facing elevations
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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
Can you pressure wash stucco?
Carefully, at 1,200 to 1,500 PSI with a 40 degree tip held 18 to 24 inches away, and only after cracks have been repaired and allowed to cure. Many professionals prefer soft washing instead, because stucco is porous and any crack carries water into the wall. If your stucco is old, cracked or over a questionable weather barrier, soft wash it.
Why does stucco need more distance than siding?
Because the surface is porous and textured rather than a smooth sealed panel. Holding the tip 18 to 24 inches back spreads the same water over a bigger area, which lowers the pressure that actually lands on the wall while still rinsing the texture. Getting closer concentrates force into the pores and any hairline crack in the finish.
What causes dark patches on stucco after washing?
Usually water held in the wall. Stucco absorbs water and gives it back slowly, so a patch that stays dark long after the rest of the wall dries is a sign that water has gone somewhere it should not, often through a crack or past flashing at a window head. That is a repair question, not a reason to wash the area again.
How often should stucco be cleaned?
Every few years for most homes, and more often on shaded elevations where algae returns quickly. Because each wash puts water into a porous surface, less frequent cleaning with a good cleaner beats frequent high-pressure washing. Keeping sprinklers from hitting the wall and gutters from overflowing down it does more for appearance than any cleaning schedule.
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.