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.
Our recommendation ranges from as low as 3,000 PSI to as high as 4,000 PSI. But, there are quite a few factors at play influencing your ideal PSI rating.
Medium Duty 2000-2800 PSI
This classification ranges from as low as 2,000 PSI to as high as 2,800 PSI. You can use a medium-duty pressure washer for almost any surface. They're great for cleaning concrete, brick, and wood.
Concrete and asphalt require more cleaning power. You'll want to use the turbo nozzle on the 1600 PSI for hard-to-clean driveways, sidewalks, and patios as well as brick paving. For wood decks and painted surfaces, switch to the gentler 40-degree nozzle.
To clean concrete effectively, use a power washer with a pressure rating of at least 3000 psi and a flow rate of at least 4 gallons per minute (gpm).
5,000 PSI. Used in special construction applications, including some large-scale commercial and industrial properties, 5,000 PSI can withstand heavy impact and extreme wear and tear.
So, what is an ideal concrete PSI for common structures? Most residential projects, such as sidewalks and driveways, require 2,500-3,000 PSI. Structural components like beams and footers require a PSI of 3,500-4,000. Concrete in this range is also a good choice for concrete slabs for storing RVs or other heavy loads.
Most people believe that concrete is solid and almost invincible. However, using a pressure washer with the incorrect tip or using too much pressure or a combination of the two can etch concrete.
The quick answer is yes, power washing can degrade a concrete surface.
If your concrete has been newly poured, make sure to wait until it has fully cured. The curing process, if done correctly, typically takes around thirty days to properly dry and set to its full strength.
The higher the PSI the more durable your concrete will be and will thus be resilient to cracking. The average residential project uses a minimum of 2,500 to 3,000 PSI; however if you're concerned about cracking then we recommend talking to your concrete contractor about stronger products on the market.
The Best Cleaner for Concrete Surfaces—Summary
Overall, we recommend Zep Purple Pressure Wash (US$13.98, The Home Depot). Alkaline cleaners are great for lifting oil stains, grease stains, and other petroleum-based stains from concrete.
Concrete typically takes 24 to 48 hours to dry enough for you to walk or drive on it.
If you want to clean your driveway quickly and efficiently, use a pressure washer of at least 3100 PSI. Using pressure washers with pressures ranging from 1000 to 2300 PSI will also help you clean your driveway, but it will take a long time.
An effective pressure wash cleans the pores of your concrete. Make sure to apply concrete sealer after pressure washing.
To maintain the lighter color of a concrete driveway, many homeowners turn to cleaning with bleach, but you should not power wash with bleach because it can damage your pressure washer.
Dish soap and water: Dish soap is a degreaser, and it works well to clean oily and grimy concrete. Create a cleaning solution of warm water and few drops of dish soap and apply it to the surface. Let it sit for a while, then mop the patio and rinse it with fresh water. Repeat the process as many times as needed.
After the concrete has dried for at least 24 hours, you can effectively apply a concrete sealer. A sealer helps prevent future stains and potential damage from products like ice salts.
Moist curing is a common method of concrete curing. It involves wetting the concrete slab often with water (5-7 times per day) for the first 7 days. This method ensures your concrete slab will be extremely strong and durable, because it allows the moisture to evaporate slowly, preventing cracks and shrinks.
PSI 6000 can be used for any application requiring concrete in a minimum thickness of 50 mm (2”), such as slabs, footings, steps, columns, walls and patios. Each - 25 kg (55 lb) bag of QUIKRETE® PSI 6000 will yield approximately 12.2 L (0.43 cu ft) of mixed concrete.
Foundations, Driveways, Patios, RV Slabs, Sidewalks
A strength of 4,000 psi (pounds per square inch) after a one month cure is the industry minimum for concrete driveways, slabs, and sidewalks. However, 4,500 psi as the ideal.
It is estimated that a 50-story structure with 4-foot diameter columns using 4000 psi concrete can reduce column diameters by approximately 33% by using 8000 psi concrete (Peterman). High –strength concrete is occasionally used in the construction of highway bridges.