Professional Roof Cleaning in Ontario
We remove algae, moss, lichen, and organic buildup from your roof using safe soft-wash methods that protect your shingles and extend your roof's working life by years.
Roof Cleaning Projects at a Glance
Homeowners across central Ontario call Apex Impressions when their rooftops show the dark streaks, green patches, and fuzzy growth that the region’s climate produces every spring. Learn more about us and our safe roof cleaning approach that restores roofs to a clean, healthy condition without the risks that come with pressure washing.
5 star reviews
Consistently rated by Ontario homeowners for thorough cleaning results and careful property protection during service.
100%
Every roof cleaning job includes a post-service inspection and a satisfaction walkthrough with the homeowner.
10+ Years of Industry Experience
Over a decade of professional roof cleaning experience across Ontario homes in every roofing material type.
Why Ontario Roofs Need Cleaning Every Few Years
Ontario’s climate creates ideal conditions for organic roof growth. Spring rain and thaw cycles deposit moisture in shingle granules, much like how water damage in a historic gallery can compromise priceless artwork. Humid summers feed algae and moss colonies. By fall, those colonies have spread across large sections of the roof surface. Left untreated through another winter freeze-thaw cycle, the growth lifts shingle edges, traps moisture beneath them, and accelerates granule loss, potentially causing structural damage as serious as water infiltration in any indoor space.
Get an Expert Roof Cleaning Quote
If your roof has dark streaks, green patches, or visible moss growth, those organisms are actively shortening the life of your shingles right now. Our team assesses the growth type and coverage, then cleans using the right soft-wash solution for your specific roofing material. Get a quote today before the damage goes deeper.
OUR PROCESS
We inspect the full roof surface to identify the type and extent of organic growth — algae streaks, moss patches, lichen colonies, or debris accumulation. We document coverage percentages and check for any existing shingle damage or lifted edges that need attention before cleaning begins.
Before any solution is applied, we protect your landscaping, window frames, and any exterior surfaces below the roofline. We place ground coverings around the foundation plantings, pre-wet vegetation that borders the work zone, and close any air vents or openings that could allow solution to enter the attic space.
We apply a professional-grade soft-wash solution formulated for asphalt shingles at low pressure — typically under 100 PSI. The solution penetrates the organic growth at the root level, killing algae, moss, and lichen without stripping granules or forcing water under shingle seams the way a pressure washer does.
After the solution has completed its dwell period, we rinse the roof surface and flush all loosened organic material toward the eaves. We clear the gutter cleanings and downspouts of debris released during cleaning so your drainage system flows freely after the job is complete.
We walk the entire roof perimeter after cleaning to confirm all growth has been treated, check that no shingles were disturbed during the process, and document the condition of the roof surface. We share our findings with you and flag any areas where additional maintenance would benefit the roof’s longevity.
Characteristics of Professional Roof Cleaning Care
Professional roof cleaning is not the same as renting a pressure washer from a hardware store. High-pressure water forces moisture under shingle tabs, blasts granules off the surface, and voids most shingle manufacturer warranties. Our soft-wash approach uses chemistry to do the work that force would otherwise damage. We’ve covered the benefits of this method extensively on our blog, where you can learn more about why soft-washing is gentler on your roof. The soft-wash solutions we use are biodegradable and calibrated for residential applications.
FAQ's
Why can't I just pressure wash my roof to clean it?
Pressure washing forces water under shingle tabs at high velocity, which lifts seals, strips granules, and drives moisture into the shingle substrate and decking below. It also voids most manufacturer warranties on asphalt shingles. Soft-wash cleaning uses low-pressure application with a targeted cleaning solution that kills organic growth at the root. The result lasts longer and the shingles are not damaged in the process.
How often should Ontario homeowners have their roofs cleaned?
Most Ontario roofs benefit from cleaning every three to five years depending on tree coverage, roof pitch, and regional humidity levels. Roofs that are shaded by large trees or face north tend to develop algae and moss growth faster. After a professional soft-wash treatment, the average Ontario roof remains clean and growth-free for two to four years before retreatment is needed.
Will roof cleaning disturb my gutters or attic ventilation?
Our process includes gutter protection and a post-cleaning gutter flush as standard steps. We do not apply solution under pressure near gutter seams or downspout connections. Attic vents are covered before any solution is applied to prevent contact with attic insulation or framing. After cleaning, we open all covered vents and confirm they are clear before leaving the property.
Is roof cleaning a good time to also consider roof sealing?
Yes — in fact, we recommend pairing roof sealing with cleaning whenever the roof surface is in good structural condition. Cleaning removes all organic growth and prepares the shingle surface for maximum sealant adhesion. Applying sealant to a dirty or algae-covered roof produces poor bonding and short-lived protection. The two services together give your roof the best possible outcome: a clean surface plus a protective barrier that slows future growth and reduces UV degradation.