Clients want black streaks and moss eliminated without pressure washing that shortens shingle lifespan, and prevention measures that slow regrowth.
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What clients expect and what professionals need to know
Roof cleaning uses soft washing (sodium hypochlorite solution at 1–3% applied at low pressure) to kill Gloeocapsa magma algae (the dark black streaking on asphalt shingles) and moss/lichen. Pressure washing asphalt shingles is prohibited — the abrasion removes granules that protect the fiberglass mat and shortens roof life by 5–10 years. Zinc or copper strips installed at the ridge release algaecidal ions with each rain to provide long-term prevention.
Clients want black streaks and moss eliminated without pressure washing that shortens shingle lifespan, and prevention measures that slow regrowth.
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Common questions from clients looking for Roof Cleaning services
Gloeocapsa magma is a cyanobacterium (blue-green algae) that grows on the calcium carbonate filler in asphalt shingles — the dark pigment is the algae's UV protection shield.
Pressure washing removes algae visually but strips granules from the shingle surface — ARMA (Asphalt Roofing Manufacturers Association) recommends only gentle chemical cleaning, never pressure washing.
The bleach solution kills algae immediately; dead algae rinse off with rain over 1–2 weeks. Don't expect instant results on the first day — the roof brightens progressively as rain washes away dead material.
Copper or zinc ridge strips release algaecide with each rain, inhibiting algae growth for 5–10 years. Trimming overhanging branches reduces shade and moisture that encourage algae growth.
Roof cleaning is routine maintenance — not covered by insurance. Some insurers require evidence of maintenance (clean roof) to continue coverage or renew policies in high-algae regions.
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