To clean a deck, some homeowners choose a washer with a pressure range of 1,300 to 2,400 psi, the same as washing a car. HGTV recommends working with the lowest pressure that cleans your deck materials gently: about 500 to 600 psi for soft woods like cedar or pine, and up to 1200 to 1500 psi for pressure-treated wood.
We recommend around 2400 PSI for the average deck. This makes the job easy without damaging most woods. Start by using the standard spray tip to get rid of any loose dirt, leaves, and other easy debris.
For cleaning a wooden deck, you'll be best served by using the lowest pressure setting that's still effective. For soft woods like cedar or pine, this is usually about 500 to 600 psi. For harder woods, it can go up to 1200 to 1500 psi. Choose the right tip to use as well.
Light-duty pressure washers are rated at 2,000 PSI or less and are suitable for cleaning automobiles, motorcycles, boats, bicycles and all-purpose cleaning. Medium-duty pressure washers produce 2,000 to 3,000 PSI and can be used to remove grease and grim from concrete, sidewalks, decks and siding.
Medium Duty 2000-2800 PSI
You can use a medium-duty pressure washer for almost any surface. They're great for cleaning concrete, brick, and wood.
Not too much but enough to expect good quality. 2000 PSI and 1.2 GPM is powerful enough to handle smaller jobs around the house and car washing. This is not enough power for larger projects.
To correctly strip old paint, you should work with a power washer with a psi of 2000 or higher. Even starting out at 2000 probably won't do the trick and you'll need to set the psi closer to 3,000 for effective paint stripping.
PSI Pressure range for Different Surfaces
Different surfaces require different levels of PSI pressure. Generally, for most residential uses, an electric pressure washer (less than 2000 PSI) will suffice. Soft surfaces, such as decks and siding, usually require more cleaning power than harder surfaces such as driveways.
You should also never set your pressure washer above 2,200 psi when washing your car. 1,500 psi is really all you need to get a good deep clean; any pressure higher than that won't make a noticeable performance difference.
2,000 - 2,900 PSI: This is a moderate strength unit used heavier residential tasks. These units are commonly sold as either electric or gas pressure washers. 3,000 - 6,900 PSI: These high pressure models are what professional pressure washers and contractors usually use.
Generally speaking, a good principle is to have the deck pressure-washed when the temperatures remain above 52 degrees both at night and during the day without rain or other condensation for several days. This allows the deck to dry as quickly as possible.
Beware Pressure Washing Damage
If you have timber deck boards, a power washer's pressure may cause splintering and damage to the timber fibres. If the timber surface already has some splintering, pressure washing will only exacerbate the issue.
Power washing your deck, patio, fence, siding, or any other outdoor structure can brighten it up and make it look new again. And while it may be tempting to apply a new coat of stain immediately after pressure washing, most experts recommend waiting at least 48 hours before applying any new products.
Spray the deck lightly with a mixture of oxalic acid and water to brighten the wood. With a 25- or 30-degree tip in the wand of the pressure washer and a psi of 1,000 to 1,200, apply the stripper to the deck, starting with the top rails and working down the balusters (Photo 1).
Selecting a pressure washer with a range of 2,000 psi to 4,000 psi will give you the most effective power for removing peeling paint. With pressure washers, as with all power equipment, always wear protective goggles and closed-toe shoes. Prepare the area around the structure you are working on.
Pressure washing is a great way to remove these deep stains that are otherwise pretty difficult to get rid of, especially for South American hardwood decks (Tigerwood, Camaru, or Ipe). Otherwise, a garden hose will generally be your best bet.
Concrete cleaning calls for powerful pressure washers featuring high pressure levels of 3000 PSI. However, if you will be using the power cleaner to maintain a range of surfaces in addition to concrete, choose one with adjustable pressure levels and set it to about 3000 PSI when you need to clean concrete.
Too high of a PSI, washing from the bottom to top (instead of the other way around to clear off dirt and debris), or putting the stream of the pressure washer in one place for too long, can strip away or cause significant scratching and other damage to the paint.
Car washes typically blast out their liquid at 1,000 to 1,200 PSI, although pressures can go up to 2,200 in some situations. For this reason, along with the squirts of hot wax and slaps from towels, we do not recommend going through a car wash on foot.
If you need to clean a two-story house, you'll need a heavy-duty or extra heavy-duty pressure washer. This will give you a water pressure of 2,800 PSI (Pounds Per Square Inch) or higher and three to four GPM (gallons per minute) of water.
The main difference is that power washing uses highly pressurized steam to do the cleaning while pressure washing just uses unheated tap water, without the help of a heating element.
Electric pressure washers are lighter, more nimble, and far quieter than their gas counterparts. And like all electric and battery-operated tools, they start instantly and are significantly better for the environment because they don't produce any emissions.
The bare minimum is usually between 2,000 and 3,000 psi for fill and simple surfaces (e.g., patios or sidewalks). ACI sets 2,500 psi as the structural concrete minimum. Pavement, slabs, and footings can be up to 4,000 psi. Suspended slabs, beams, and girders (typically found in bridges) might be 5,000 psi.
For a typical car, use 1,200 to 1,900 PSI and 1.4 to 1.6 GPM for 1,900 to 2,800 cleaning units. Anything above risks the car's coating and paint. Electric vs. Gas: In general, gas-powered pressure washers tend to deliver more power.
If you're wondering whether pressure washing can damage wood, the short answer is yes, but only if you're not careful. That's why it's best to leave it to the professionals to pressure wash wood surfaces for you.