Most people who search for roof pressure washing want the dark streaks gone. We get that. On asphalt shingles the streaks are usually a cyanobacterium called Gloeocapsa magma, which feeds on the limestone filler in the shingle and spreads on the wind, as the Asphalt Roofing Manufacturers Association explains. Tile, flat, and metal roofs grow algae and mildew of their own.
High pressure takes the protective surface off and can push water under the roof. We use a soft wash instead: low pressure, and a roof-safe cleaner that does the actual work.
High-pressure blasting compared with low-pressure soft wash on a roof| On your roof | High-pressure blasting | Our low-pressure soft wash |
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| Shingles | Knocks off protective granules. | Granules stay in place. |
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| Algae and mildew | Roots stay and streaks return sooner. | Cleaner kills growth at its base. |
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| Water intrusion | Can force water under the roof surface. | Gentle flow that follows the way rain runs. |
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| Tile, flat, and metal | Can chip tile and scar coatings and membranes. | Safe on tile, flat roofs, metal, and shingle. |
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Cutler Bay roofs are mostly concrete tile on Mediterranean-influenced construction built since the town's 2005 incorporation, with shingle on some older sections near Lakes by the Bay. Heat and humidity grow algae and mildew on both. We keep tile pressure far under the roughly 1,200 psi ceiling tile manufacturers set, work with a concrete-compatible cleaner, and limit our footing to where the tiles overlap.
Cutler Bay is inside Miami-Dade County's High-Velocity Hurricane Zone, and roofing products installed here need a Miami-Dade Notice of Acceptance, which matters given how much of the town's housing was rebuilt to post-Andrew standards. We clean roofs. Repairs and re-roofing belong to a licensed roofer, and given the area's flood risk, drainage work beyond a gutter or downspout belongs to a licensed contractor as well. Roofs in Lakes by the Bay, among the town's oldest post-Andrew construction, typically need washing sooner than the newer roofing common toward Black Point Marina and the town's more recently developed sections.
Most roofs do well with a wash every two to three years. Shaded slopes and roofs under trees grow algae faster and may need it sooner. A damp, algae-covered roof also sheds more grit into the gutters below, which is one more reason we handle both in a single visit.
See how our roof washing works in Cutler Bay