If you live in St. Petersburg or anywhere in Pinellas County, you’ve watched it happen: a gray-green film creeps up the north side of your siding, the driveway turns mottled, and the pool deck gets a little slicker every season. Our humidity does that; algae and mildew love warm, damp, shaded surfaces, and they grow here almost year-round. The right house pressure washing tips are the difference between a clean home and a gouged one. This guide walks you surface by surface, with the PSI to use, how to protect your landscaping, and when to stop and call a pro.
Pick the right PSI before you pull the trigger
Pressure washers are rated in PSI (pounds per square inch), and more is not better: using too much PSI damages the surface you’re cleaning, and the right number depends on what you’re pointing it at.[1] Vinyl siding sits at the top of the house-washing range, roughly 1,300 to 2,000 psi in the published vendor tables, while wood fences and decks want 500 to 1,500 psi.[1] ECHO’s house-washing guide puts a typical exterior at 1,800 to 3,000 psi overall, but pairs each material with a nozzle rather than more pressure: brick takes a 15° tip with a masonry-friendly detergent, stucco a wider 40° tip, and wood the widest fan at the lowest setting.[2] When in doubt, start at the low end with the widest spray tip that still cleans and step up only if you need to.
| Surface | Pressure and tip |
|---|---|
| Vinyl siding | 1,300–2,000 psi with a fan tip, keeping your distance |
| Wood fence or deck | 500–1,500 psi; lowest setting, 40° fan, with the grain |
| Stucco | 25° to 40° tip, at least 2 feet back from the surface |
| Brick | 15° tip with a masonry-friendly detergent; wet the surface first |
Protect your plants first (they’re what DIY-ers usually kill)
Your landscaping sits closer to the spray than anything else, and it’s the first thing a homeowner accidentally wrecks.
The reason matters: the sodium in ordinary household soaps is toxic to plants, and heavy use can leave enough sodium ions on the leaf surface to dry the tissue out.[3] The detergents in pressure-washing mixes are even harder on the waxy coating that protects leaves.[3]
So before you spray anything, wet down and cover the beds against the house.[2] ECHO’s prep guidance is to lay plastic sheeting or drop cloths over delicate foliage to protect it from the spray and from chemicals or detergents.[2] Simpson’s exterior guide adds the same step for shrubs and flowers, plus a first pass most homeowners skip: repair any damaged siding or trim before you wash, because water force makes existing damage worse.[4] Give shrubs a plain-water soak first, cover what you can, and rinse everything off with clean water when you’re done.[2]
Quick house pressure washing tips at a glance
- Test a small area before you tackle a whole wall.[2]
- Keep the wand moving in slow, controlled, side-to-side strokes; never park it in one spot.[2]
- Start at the bottom of the wall and work up, which prevents streaking from runoff.[2]
- Use the widest spray tip that still cleans, and a 40-degree fan for wood and vinyl.[2]
- Wash in the shade or on an overcast day so detergent doesn’t dry and streak.[2]
Surface by surface around a St. Pete home
House exterior and siding
Most St. Pete homes are concrete block, stucco, or vinyl. Vinyl can take a fan tip in the 1,300 to 2,000 psi range, while stucco wants a 25° to 40° nozzle held at least two feet back.[1][4] Apply detergent from the bottom up so suds don’t run down and leave streaks, then let the rinse run down with gravity from the top.[2] Stay a few feet back and use a wide fan tip; a pinpoint 0-degree nozzle at close range is how siding gets etched.
Concrete driveway
Driveways and sidewalks are the highest-PSI surfaces; concrete can take the heat. But even concrete etches if you hold the wand too close or too long in one spot. Use a fan tip, keep the wand moving in overlapping passes, and pretreat oil stains and the algae that collects in the shaded cracks of a Florida driveway. For a full cost breakdown, see how much pressure washing costs in St. Petersburg.
Sidewalk and walkway
Same rules as the driveway: concrete takes the highest pressure of anything on the property, and the wand keeps moving in side-to-side strokes.[1][2] Walkways are where you’ll see the before-and-after the fastest, since they’re flat, light-colored, and catch every bit of mildew our humidity throws at them.
Pool deck
Pool decks and pavers are where St. Pete homeowners do the most damage, because sealed concrete and travertine etch under pressure you wouldn’t blink at on a driveway. Drop the PSI, use the widest tip you have, and keep moving. The goal is to lift the grime and the algae, not to resurface the pavers.
Wood fence
Wood splinters and “furs up” under high pressure. Use a low setting and a wide 40-degree fan, and wash with the grain, not across it.[2] If the fence is gray with mildew rather than just dusty, this is the point where pressure washing vs soft washing matters; a soft-wash mix often does the job at a fraction of the pressure.
Roof: don’t pressure wash it
This is the line where DIY stops. High-pressure water doesn’t belong on asphalt shingles; it can dislodge the granules that protect the roof, and a bleach-based soft wash is how roofs actually get cleaned in Pinellas, where north-facing slopes grow a thick lichen-and-algae crust. You also shouldn’t be on a ladder to reach it in the first place: both ECHO and Simpson are explicit that a pressure washer and a ladder don’t mix, because the recoil can put you on the ground.[2][4] Roofs are a hire-it-out job, full stop.
The DIY-vs-hire line
Washing a driveway, a sidewalk, or a single-story patio is a reasonable weekend job. Three things tip it toward calling a pro:
- Chemicals. A proper soft-wash mix and its runoff need to be handled and rinsed correctly, especially around plants.[3]
- Reach. Anything above a single story tempts you onto a ladder, and you should never be on one while spraying.[2][4]
- Roofs. Soft wash only, and it’s not work you should be doing from the ground or the ridge.
Safety that DIY-ers get wrong
- Never stand on a ladder while spraying. The recoil can knock you off balance, so stay on the ground and use an extension or telescoping wand instead.[2][4]
- Never spray directly at electrical outlets, fixtures, or power lines; cover or switch off outlets first.[2]
- Keep pets and children away from the work area.[2]
- Wear eye protection and closed, non-slip shoes every time; a stray fan tip at close range will cut skin.
Frequently asked questions
What PSI should I use to pressure wash my house?
Vendor tables put vinyl siding at roughly 1,300 to 2,000 psi, and ECHO’s house guidance frames a typical exterior as 1,800 to 3,000 psi overall, matched to the material with the right nozzle.[1][2] Start low and step up only if you need to.
Is it safe to pressure wash vinyl siding?
Yes, within reason. Vinyl takes more pressure than stucco or wood, with a published range of about 1,300 to 2,000 psi, but use a wide fan tip and keep your distance.[1] Too-close, too-narrow spray is what forces water behind the siding or etches it, so reach for a wider tip before you reach for more pressure.[2]
Can you damage concrete with a pressure washer?
Yes. Holding the wand too close or too long in one spot etches concrete and pavers, which is why pool decks and driveways need a wider tip and a moving wand. For a full breakdown, read our guide on does pressure washing damage concrete.
How do I protect my plants when pressure washing?
Wet them down first, cover delicate foliage with plastic sheeting or drop cloths, and rinse everything with clean water afterward.[2] The sodium in ordinary soaps is toxic to plants, so keeping detergent off the leaves is the whole point.[3]
Can I pressure wash my roof?
No. Roofs get cleaned by soft washing, not high pressure, and the work doesn’t belong on a ladder. Hire it out.
The bottom line
House pressure washing in St. Pete comes down to matching the PSI to the surface, protecting your plants from detergent, and knowing where DIY ends: at the roof and anything that needs a ladder. Get the pressure and the prep right and you’ll strip a season of Pinellas algae and mildew without etching a single paver. Get it wrong and the fix costs more than the wash would have.
We pressure wash homes, driveways, pool decks, fences, and roofs (by soft wash) across St. Petersburg and Pinellas County. If the job is bigger than your weekend, or it involves a roof, a second story, or a chemical mix, get a free estimate and we’ll walk the property and tell you straight what each surface needs.
Sources
[1] https://www.dultmeier.com/what-psi-pressure-washer-do-i-need — Pressure Washers: What PSI Do I Need? — Dultmeier
[2] https://www.echo-usa.com/applications/pressure-washing-house — ECHO: Pressure Washing Your House
[3] https://journals.flvc.org/edis/article/download/109384/122928/194558 — UF/IFAS ENY344/IN1248 Managing Plant Pests with Soaps
[4] https://simpsoncleaning.com/how-to-pressure-wash-your-homes-exterior — Simpson Cleaning: How To Pressure Wash Your Home’s Exterior