If the roof gets 70 PSI, what does the driveway get?
It's a fair thing to wonder. A company that spends its whole pitch talking about how gentle the roof cleaning is can start to sound like it might go easy on everything, including a driveway that actually needs some force behind it to come clean. Here's the other half of the story: the driveway is the one surface where high pressure is the correct call, and it gets it.
The actual number
Concrete, sidewalks, curbing and pavers run 3000 to 4000 PSI. That's not a typo next to the roof's 70. It's a completely different surface with a completely different set of rules. A roof tile cracks under force it isn't built for. Concrete and pavers are built for exactly this kind of pressure, and the growth sitting in and on them doesn't come out any other way.
Why hard surfaces need what soft surfaces can't take
The growth that streaks a roof or a wall is the same basic organic buildup that shows up on a driveway, but on concrete and especially in paver joints, it gets down into the texture, not just sitting on top the way it does on a smooth painted wall. Low pressure would leave most of that where it is. High pressure at the right distance clears it out of the joints and off the surface, which is the whole reason the number is what it is here instead of matching the rest of the exterior.
Where high pressure would actually be wrong
The number matters because of what it isn't used on. Take that same 3000 to 4000 PSI and put it on a roof tile and it cracks. Put it on shingle and it strips the granules that protect it. Put it on a pool cage screen and it cuts straight through the mesh. Put it on painted stucco and it takes the paint with the dirt.
That's the entire logic of matching pressure to the surface, and it's why a company that runs one setting on everything is going to damage something eventually. The roof number and the driveway number being fifty times apart isn't a contradiction. It's the point.
Pavers have their own considerations
Pavers behave a bit differently from a poured concrete slab. The growth doesn't just sit on top, it works down into the sand joints between the stones, and clearing that out is part of what makes the difference between a paver driveway that looks cleaned and one that looks properly done.
That does mean joint sand gets displaced during a thorough cleaning, which is normal and expected rather than a problem, though it's the reason paver work and re-sanding tend to come up in the same conversation. Worth asking about together rather than discovering after the fact.
The part that matters more than it sounds like
A driveway or walkway covered in algae isn't just unattractive. It's slick, especially when it's wet, and that's a real fall risk. That matters more here than it might somewhere else, since a lot of the households in North Port and the surrounding area skew older, and a slippery front walk is a genuinely different kind of problem than a dark stain that just looks bad.
Why North Port sees this a lot
A dirty driveway is one of the most visible things on a property, right at the street, and it's also one of the fastest ways a neighborhood effect kicks in. Once one driveway on a block gets done and it's an obvious difference, it's common for a couple of neighbors to ask about the same thing within weeks. That's not a coincidence, it's just what happens when the before and after sits at the end of a driveway everyone drives past.
Where a driveway can genuinely be damaged
High pressure being correct for concrete doesn't mean anything goes. Held too close and in one spot, a pressure washer can etch lines into a concrete surface, and those don't come back out. Older concrete that's already spalling, meaning the surface is flaking, is more fragile than it looks and can lose more material under aggressive treatment.
So the skill isn't in turning the pressure up. It's in knowing the right distance and keeping the wand moving evenly, which is also the difference between a driveway that comes out uniformly clean and one covered in visible stripes where the passes overlapped badly. If you've seen a driveway with a zebra pattern across it, that's what that is.
If it comes back faster than you'd like
Growth returns to bare concrete and pavers the same way it returns to anything else outdoors, and how fast depends on shade and moisture. If that turnaround feels too quick after a cleaning, sealing is usually the better long-term answer rather than just cleaning more often. Sealing closes up the surface so growth has a harder time taking hold again in the first place.
Common questions
If you use 70 PSI on roofs, is my driveway going to actually get clean?
Yes. The driveway gets 3000 to 4000 PSI, because concrete is built for it. The low number on the roof exists because a roof isn't. Different surfaces, different settings, on purpose.
Will pressure washing damage my concrete?
Done wrong, held too close in one spot, it can etch the surface. Done correctly with even passes at the right distance, concrete handles this pressure without a problem.
Why does the growth come back in my paver joints so fast?
Joints hold moisture and organic material better than a flat slab does, which is exactly the condition growth likes. Sealing is usually the better long-term answer than cleaning more often.
Get a number for your driveway
Send a photo of the driveway, walkway or paver area that needs attention, and pricing comes back the same way, no one needing to walk the property first.