Both concrete and decks can be pressure washed. However, roofs, bricks, and cars can’t. That’s where pressure washing surfaces can cause problems. If you are not careful with your pressure washer, you can damage the surface of the materials that cannot withstand pressure washing in North Ridgeville. Homeowners often call about what surfaces can be safely pressure washed around a house. And let’s address the answer today!
Safe Pressure by Surface, at a Glance
These are the pressure ranges Consumer Reports recommends after testing, which line up with what works in the field:
- Concrete driveways and walkways: 1,500 to 3,000 PSI
- Wood and composite decks: 800 to 1,000 PSI
- Vinyl and fiber cement siding: 1,200 to 1,500 PSI
- Brick and mortar: 300 to 400 PSI on older masonry, chemistry instead of pressure
- Asphalt roofs: none, use a soft wash
- Cars: none, use a hose and sponge
Concrete Takes the Most Pressure of Anything on Your Property
Concrete is the one surface you can be aggressive with. Driveways and walkways withstand a powerful cleaning without etching, and Consumer Reports puts the useful range at 1,500 to 3,000 PSI. Anything under 1,500 PSI cleans it eventually, just slowly.
For oil stains, a narrower nozzle spot-cleans better. For the green and black film Ohio shade produces, drop the pressure and suds the surface first, because pressure alone just spreads algae around. Concrete pressure washing has a timing rule here that other regions ignore: wash and seal before freeze-thaw season, never during it. Pairing concrete cleaning and sealing is what keeps a Northeast Ohio driveway from spalling.
Decks Need About a Third of the Pressure a Driveway Does
Decks clean at 800 to 1,000 PSI, roughly a third of what concrete takes. Hardwoods like ipe and cumaru handle a wash without complaint. Pressure-treated Southern yellow pine is soft, so it etches if you hold the nozzle close, and the damage looks like furry raised grain that won’t sand out.
Composite decking is where people get burned. Trex and TimberTech usually clean with a light scrub and a hose rinse, and their warranty terms may exclude pressure washing outright. Read the warranty first. Work along the board following the grain, and test somewhere nobody looks. If the deck is already gray and fuzzy, book deck cleaning instead of experimenting.
Can You Pressure Wash Siding and Concrete the Same Way? No.
Siding gets 1,200 to 1,500 PSI at most, and the material decides everything. Vinyl and fiber cement are pliable enough to take a wash. Aluminum dents, so start at the lowest setting with a wide nozzle. Shingle siding shouldn’t be pressure washed at all, since the spray knocks shingles loose.
One rule matters more than pressure: keep water out of the wall. Don’t spray into gaps around windows, doors, or under lap joints. Trapped moisture between siding and sheathing grows mold you won’t see for years.
If your house was built before 1978, have the paint tested by an EPA-licensed lead-remediation specialist before washing painted wood clapboard. Knocking lead paint loose puts it in your soil permanently, where kids kick it up and track it inside. That’s why a house washing service on an older Ohio home should ask about the build date before quoting.
Never Pressure Wash a Roof or a Car
Don’t pressure wash either one. On an asphalt roof, the spray strips the embedded granules that give shingles their lifespan, and washing from a ladder is its own hazard because blowback throws you off balance. Kill roof algae with a solution applied from the ground, or book roof cleaning.
Cars are simpler. Pressure nicks the paint, nicked paint rusts, and a sponge costs four dollars.
Brick Looks Tough and Isn’t
Brick is the surface homeowners misjudge most. The brick is hard, but the mortar between it is soft, and pressure chisels that mortar out and opens channels for water to get behind the wall. On older or handmade brick, the gentlest effective method is the standard, generally no more than 300 to 400 PSI. Repointing a wall runs into the thousands.
Get the Pressure Right the First Time
Professional pressure washing is mostly the judgment above, applied before the water turns on. Exact ProWash handles residential pressure washing and commercial pressure washing across Northeast and Central Ohio, matching the method to each surface instead of running one setting over everything. Call (330) 639-5249 or request a fast quote.
FAQ’s
▶ Which Surfaces Are Safe for Pressure Washing?
Driveways made from concrete, as well as wooden decks and patios made from vinyl or fiber cement, can be considered to be the safest surfaces to be pressure washed at home. Different pressures need to be utilized because while decks require 800 PSI, concrete requires as much as 3,000 PSI. Roofs, cars, siding made from shingles, and old bricks should not be pressure washed.
▶ What PSI Is Too High for a House Exterior?
Siding cannot be washed at more than 1,500 PSI. Rental gas pressure washers operate at an unbelievably high pressure of 3,000 to 4,000 PSI, due to which the siding gets cracked if someone tries to wash it by himself. It is important to use the proper pressure washing approach, which means the pressure applied should be reduced in comparison to what is required.
▶ Do You Need Different Equipment for Different Surfaces?
To achieve the desired pressure, one should use one of three types of nozzles depending on the type of work being performed. The angle of the nozzle used for power washing services should be 40-degree, for patios should be 25-degree, while for detailed jobs, a 15-degree nozzle should be used. The use of zero-degree pressure nozzles is definitely a bad idea.
▶ How Often Should Ohio Surfaces Be Washed?
Once a year for most of the exterior. Shaded north-facing walls need it more often, since Ohio humidity feeds algae. Driveway pressure washing in high-traffic areas does well twice a year, ideally with a seal coat going into fall.
