Asphalt shingle roof with dark algae streaks partially cleaned, viewed from an elevated angle

Those dark vertical streaks running down an asphalt roof are Gloeocapsa magma — a hardy algae that feeds on the limestone filler in modern shingles. It spreads by airborne spores, which is why it tends to move down a street one house at a time. Left alone it holds moisture against the shingle, darkens the roof surface, drives up attic temperatures, and shortens the life of the roof you're paying to keep.

Roof cleaning is the one job where pressure is unambiguously the wrong answer. A pressure washer strips the protective granules off asphalt shingles, and once those granules are in your gutters the shingle underneath is exposed and aging fast. High pressure also voids most manufacturer warranties outright.

Why pressure washing a roof is the wrong tool

We use the soft-wash method recommended by the Asphalt Roofing Manufacturers Association: a cleaning solution applied at roughly garden-hose pressure that kills the organism outright, then a gentle rinse. Because there's no mechanical scrubbing, there's no walking pattern worn into your roof, no lifted shingle tabs, and no debris blasted into your gutters or landscaping.

Preparation is most of the work. We tarp and pre-wet foundation plantings, protect anything downstream of the runoff, and rinse the surrounding surfaces once the treatment is done. Gutters, downspouts, and the driveway below get rinsed as part of the job.

A properly soft-washed roof typically stays clear for years in the Kansas City climate rather than months. If you're preparing to sell, roof cleaning is one of the highest-return exterior services there is — it's the difference between a buyer seeing a maintained roof and a buyer mentally subtracting a roof replacement from their offer. Call (816) 500-5502 for a free quote.

Roof Cleaning available in Belton, Raymore, Grandview, Peculiar, Harrisonville, Lee's Summit, Pleasant Hill and the south Kansas City metro.

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Prefer to talk? Call (816) 500-5502

Call (816) 500-5502