If you're simply trying to clean your driveway or walkway, then power washing alone will be sufficient. However, for long-lasting results and to prevent mold and mildew from penetrating the surface, sealing is necessary.
Oil leaks, blood, and sticky residues can absorb and result in stubborn stains. However, using a driveway sealant after pressure washing can help prevent these stains from becoming permanent features in your driveway.
Use Concrete Sealer After Power Washing
Think of your driveway like one big sponge. It soaks up everything! An effective pressure wash cleans the pores of your concrete. Make sure to apply concrete sealer after pressure washing.
Sealing your concrete isn't really a labor-intensive, nor costly, job. By sealing your concrete every 2-5 years, as recommended by experts, you should keep your floor in good shape, preventing cracks, pitting, and additional damage.
An unsealed concrete floor is going to be more reactive and sensitive to changes in temperature. It will freeze in cold climates and expand in warm ones. This can cause crumbling, chipping, and cracking.
While the advantages outweigh the negatives, there are some disadvantages that you should keep in mind before sealing your concrete driveway. Sealant can make the surface slippery. Sealants tend to dry down with a glossy or semi-glossy sheen that can be quite slick, especially when wet.
Yes, because a pressure washer is 30-80 times stronger than your hose, it can cause damage if used improperly. If your concrete becomes etched during the pressure wash, you should stop before causing further damage and reduce the pressure.
Generally, you'll want your concrete driveway pressure washed at least once a year. This lets you treat sunbaked dirt, grime buildup, and stubborn oil stains, making regular cleaning in between professional washes much more manageable. Of course, you can always schedule extra pressure washing services as needed.
Properly curing your concrete improves strength, durability, water tightness, and resistance for many years. The first 7 days after installation you should spray the slab with water 5-10 times per day, or as often as possible. Once the concrete is poured the curing process begins immediately.
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.
It's Never Too Late …
Sealing your garage floor might not be possible if you have moisture in your garage. This is typically the only scenario where we don't recommend sealing right away, mainly because you should deal with the cause of the moisture first. It could be due to a plumbing leak or a drainage issue.
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.
The most ideal time to pressure wash, however, is during the spring and summer months. During the warmer wetter months algae and mold will begin to grow. This is also a great time pressure wash because this is when pollen is usually at it's highest. Power washing can improve your allergy symptoms.
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.
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.
If the rain begins after 2-4 hours from concrete placement, the surface needs to be covered; otherwise, the concrete surface will suffer damages. If rains pound on concrete 12 hours after placement, the likeliness of any damage is negligible.
There's no doubt that electric pressure washers from 1,300 to 2,300 psi can wash a concrete driveway, but it'll take longer. If you have a large driveway with lots of stains, you'll want more power to do the job faster. I chose the 3,100-psi gas pressure washer and cut the job time in half.
Polyurethane sealers
Heftier than its acrylic counterpart, polyurethane sealer creates a thick layer of protection on top of the concrete surface. It also works well for both indoor and outdoor use and comes in both water-based and solvent-based forms. It's highly durable and provides great stain protection.
While sturdy and durable on its own, it does require some protection, such as a silicone-based surface sealant like Quikrete's Concrete & Masonry Waterproofing Sealer, to waterproof the surface and keep it looking freshly poured.
Solvent base sealers tend to over darken concrete stain, looking as it does when saturated wet with water. Water base sealers such as Clear Shield, makes the concrete look as it does when damp with water, not saturated wet but not dry either.
Concrete can be described as a hard sponge that soaks up oil and water-based spills. Easily marked by tires and outdoor elements, it is important to seal the surface, so it looks beautiful year-round. The other benefit to sealing concrete is improved cleaning and maintenance.