Pressure Washing in Toronto

The surface decides the method, not the machine

The phrase “pressure washing” causes most of the damage we get called out to look at, because it puts the emphasis on the pressure. On the majority of Toronto’s older housing stock, pressure is the thing you want least of.

Pre-1920 brick in the old city is typically soft-fired red clay laid in lime mortar. Lime mortar is deliberately softer than the brick — it is meant to be the sacrificial element, and it can be repointed. Put a turbo nozzle on it and you will blow the joints out and erode the brick face at the same time. That damage does not wash off. It gets repointed, at considerable cost, or it lets water into the wall.

So the method splits:

Soft wash — low pressure, a detergent doing the work chemically, dwell time, then a controlled rinse. This is what goes on brick, stucco, painted wood, vinyl siding, and anything with organic staining. It is slower and it looks less dramatic while it is happening. It is also the only correct answer on most of the pre-war stock from Parkdale through to Leslieville.

Calibrated pressure — a surface cleaner at a controlled PSI. This is for concrete driveways, walkways, aggregate, and unpainted stone. Here pressure genuinely is the tool, and a surface cleaner rather than a wand is what gives you an even result instead of the zebra striping you see on half the driveways in the city.

A quote that does not distinguish between these was not written for your property.

The algae problem, and why it comes back

The black or dark green staining that shows up on north and northeast walls in Toronto is not dirt. It is a living colony — typically Gloeocapsa magma and related organisms — and it settles where surfaces stay damp longest.

That distinction matters because it changes what “clean” means. Pressure will knock the visible surface layer off a colonised wall and the wall will look transformed for about a season, after which it returns looking exactly as it did. The organism was never killed; it was scraped.

A soft wash with an appropriate solution kills it. The result holds two to three years rather than two to three months. It is the single biggest difference between a cheap exterior clean and one that was worth paying for, and it is invisible on the day — you only find out which one you bought the following summer.

Toronto’s humidity through July and August, combined with mature tree cover keeping walls shaded, makes this a much bigger factor here than in drier or more open parts of the province.

Toronto-specific constraints

Narrow lots and shared paths. Semis and rowhouses through the Junction, Dovercourt, Parkdale and Leslieville have a path between houses that is often under a metre. Water has to be managed rather than simply directed away, because “away” is the neighbour’s foundation. On these lots we control volume and runoff deliberately.

Rear laneways. A genuinely Toronto piece of work. Laneway concrete and pavers collect moss and algae, and by October they are slippery enough to be a real hazard, particularly on the sloped lanes in the east end. Annual cleaning is worth it for that reason alone.

Street parking and equipment. We work off the truck and need roughly one vehicle length. In permit-only zones through the Annex, Kensington, Little Italy and much of the old city, confirm at quoting whether visitor parking is available. If not, we can stage nearby and run hose, but it adds time.

Drainage into the storm system. Toronto lots shed water to the street quickly. We use biodegradable detergents and avoid sheeting heavy runoff straight into a catch basin, directing rinse water onto soft landscaping where the lot allows.

Neighbourhood notes

Cabbagetown and Riverdale. Heritage brick, lime mortar, and a high concentration of the exact conditions where high pressure causes irreversible damage. Soft wash throughout. Porches and front steps are usually the surfaces that actually need attention.

Parkdale and Roncesvalles. Rough-cast stucco is common and it is fragile — it sheds aggregate under pressure. Chemistry, not force.

Leslieville and the Beaches. Mixed stock, plenty of painted wood porches and decks. Lakeside properties pick up more organic growth on shaded elevations.

The Junction and Dovercourt. Narrow shared paths, laneway access, and a lot of concrete that has never been cleaned properly. Good candidates for a surface cleaner rather than a wand.

Leaside and North Toronto. Larger lots, more driveway and walkway area, better access, and generally later brick that tolerates a more robust approach.

Etobicoke and Scarborough. Post-war stock with more vinyl and aluminium siding. Soft wash on the siding, pressure on the concrete. Straightforward, efficient work.

What we clean

Driveways, walkways and front steps. Porches, decks and railings. Fences. Siding — vinyl, aluminium, wood. Brick and stone, by soft wash. Patios, interlock and flagstone. Rear laneways and shared paths. Garage floors and pads.

What we will not do

We will not high-pressure a heritage brick façade because it is faster. We will not clean a peeling painted deck and pretend the result is good — cleaning it mostly makes the peeling more obvious, and we will tell you that before you spend money. We will not take on underground parking ramps or large condo common areas, which need water reclamation and equipment we do not run.

And we will not quote a per-square-foot rate for masonry over the phone. The right method depends on the age of the brick, the mortar, the exposure and what is actually growing on it, none of which are visible from an address.

Timing

Spring, from April, is the main season. Winter salt is abrasive and corrosive, and it sits on concrete all through March. Clearing it before the summer growth cycle starts is the single most useful visit of the year.

Early autumn is the better window for anything organic. Algae growth peaks through the humid part of the summer, so a September or early October soft wash catches it at maximum and leaves the surface clean going into winter — which also means less slip risk on laneways and steps through the freeze season.

We do not pressure wash below freezing. Water on concrete in a Toronto February is a liability, not a service.