Soft wash, pressure wash, and what is safe.

The questions St. Catharines homeowners ask before booking, answered straight, including the one that matters most: what is actually safe for your roof and siding.

Got an exterior-cleaning question in St. Catharines? Start here.

Questions Niagara homeowners ask about exterior cleaning

These answers apply broadly to exterior cleaning in St. Catharines and across the Niagara region. Confirm specifics with a licensed local contractor before any work begins.

Soft washing vs pressure washing, what is the difference?

Pressure washing uses high force, often 1,500 to 3,000 PSI, to blast a surface. Soft washing uses low pressure, closer to a garden hose, paired with a cleaning solution that kills algae and mould at the root. For house exteriors and roofs, soft washing is safer and lasts longer because it treats the growth instead of just knocking it off. High pressure is appropriate for hard flatwork like concrete driveways; it is the wrong tool for siding, stucco, or shingles.

Is pressure washing safe for my roof?

No. High pressure strips the protective granules off asphalt shingles and can void the warranty. The asphalt roofing manufacturers approve only soft washing for shingles, which treats the algae at low pressure. If a quote mentions power-washing a shingle roof, treat it as a warning sign.

Will pressure washing damage my siding?

It can. Too much pressure forces water behind vinyl and into wall cavities, etches brick, and pits stucco. That is why exteriors should be soft washed: the clean is deeper and the surface stays intact. Older homes built before modern moisture-barrier standards are the most at risk from high-pressure direct application.

How much does it cost to wash a house in St. Catharines?

Most St. Catharines homes land between $300 and $600 for a full exterior soft wash, depending on size and how heavy the algae is. Driveways run $100 to $250. Bundling a house wash with the driveway usually lands around $400 to $750. These are illustrative Niagara-market ranges; confirm with a licensed local contractor. See the full cost guide.

How often should I wash, and when is the best time?

Most St. Catharines homes need a soft wash every one to three years, sooner on shaded north sides near the lake. The best window is a dry, mild stretch from May through September. Early summer is ideal, before the deep-summer booking rush.

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Hiring a soft-wash or power-washing contractor in Niagara

Before any work starts, confirm the contractor carries liability insurance. Ask whether they soft wash exteriors and roofs rather than pressure-blasting them, and ask for references or photos of past work in the Niagara area. A contractor who wants to put a high-pressure tip on your siding or shingles is worth skipping.

Insist on a written, flat quote that says which surfaces get soft washing and which get higher-pressure cleaning. That distinction matters: house exteriors, roofs, and older siding need low pressure plus a cleaning solution, while hard flatwork like a concrete driveway can take a surface cleaner at higher pressure. An estimate that treats every surface the same is a warning sign.

Ask specifically how the roof will be cleaned if roof algae is part of the job. The asphalt-shingle manufacturers approve soft washing only; high pressure strips the protective granules and can void the warranty. The right answer is a low-pressure treatment, never a pressure washer on the shingles.