Every spring in Edmonton, the snow melts and homeowners get their first real look at how the winter treated their driveway. Oil stains, salt residue, cracked concrete edges, and a general grey griminess that no amount of rain seems to wash away.

Pressure washing is one of the most satisfying home maintenance tasks you can do — but done wrong, it can damage your concrete, strip your interlock sealer, or leave you with a patchy result that looks worse than before you started. Here’s what you need to know.

What Pressure Washing Actually Does

A pressure washer uses a high-velocity stream of water — typically between 1,500 and 4,000 PSI for residential use — to blast contaminants off hard surfaces. When done correctly, it removes:

• Road salt and de-icing chemical residue
• Oil and fluid drips from vehicles
• Algae, moss, and mildew growth
• General dirt, dust, and tire rubber
• Winter sand that gets compacted into concrete pores

The result is a surface that looks significantly brighter and cleaner — and one that’s actually safer, since algae and moss buildup on driveways creates a slip hazard when wet.

The Problem With DIY Pressure Washing

Renting a pressure washer and going at your driveway sounds simple. In practice, there are a few ways it goes sideways:

Too much pressure on the wrong surface. Standard concrete can handle higher PSI. But older concrete, interlocking brick, exposed aggregate, and stamped concrete are much more vulnerable. Too much pressure erodes the surface finish, pits the concrete, and — in the case of interlock — strips the sand from the joints, causing settling and movement.

Inconsistent technique. The striping pattern that shows up on a driveway after an amateur pressure wash job is one of the most common complaints we see. If you don’t maintain a consistent distance and overlap, you get visible lines in the finish.

No post-treatment. Pressure washing opens the pores of concrete. For best results — especially on driveways — a penetrating sealer applied after cleaning locks out future staining and makes maintenance much easier going forward.

What We Recommend for Edmonton Driveways

1. Time it right. Wait until daytime temperatures are consistently above 5°C before pressure washing — ideally 10°C or higher. Wet concrete in near-freezing temps can re-freeze and expand, causing micro-cracking.
2. Pre-treat oil stains. A degreaser applied 15–20 minutes before washing dramatically improves results on vehicle fluid stains. Don’t skip this step.
3. Seal after. A quality concrete sealer applied after washing protects your investment and makes next year’s clean significantly easier.
4. Don’t forget the edges. The transition between your driveway and the lawn or garden bed is where moss and organic buildup is usually the worst. A detail pass along all edges makes a visible difference.

When to Call a Professional

If your driveway has oil stains that have been sitting for more than a season, visible algae or moss growth, or you have interlocking pavers that you don’t want to risk damaging — call us first. We use commercial-grade equipment and the right detergents for each surface type, and we carry the insurance to work on your property safely.

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