Roof Cleaning in Charleston, SC

Roof Cleaning in Charleston, SC

Roof cleaning in Charleston SC uses a low-pressure soft wash (under 100 PSI) with sodium hypochlorite and surfactant to kill the algae, lichen, and moss that cause black streaks on asphalt shingle roofs. This is the only roof cleaning method approved by the Asphalt Roofing Manufacturers Association (ARMA Bulletin F284) — and the only method that won’t void your shingle warranty.

Typical investment in the Charleston area: $400 - $800. Single-story ranches: $400-$500. Two-story homes: $500-$700. Larger or complex roofs (multiple peaks, dormers, steep pitch): $700-$800. Every Charleston roof gets a written, itemized estimate including roof access plan and plant protection.

Why Charleston roofs streak black

Those ugly black streaks running down Charleston shingle roofs are not dirt — they’re a cyanobacterium called Gloeocapsa magma. It feeds on the limestone filler in modern asphalt shingles. Charleston’s combination of heat, humidity, and constant moisture is essentially a greenhouse for it, which is why nearly every shingle roof over 5 years old in the Lowcountry has visible streaking on the north and west exposures.

Left untreated, Gloeocapsa magma shortens shingle life by 30-50%. The granules that protect the asphalt detach faster, the shingle dries out, and what should be a 25-year roof becomes a 15-year roof. Cleaning isn’t just cosmetic — it’s roof preservation.

Why pressure washing a roof is dangerous

Most Charleston roof problems we get called for are actually botched DIY pressure-wash attempts. High pressure blows shingle granules off (the granules ARE the roof’s UV protection), forces water under shingles into the deck below, and can void warranties from GAF, CertainTeed, Owens Corning, and IKO. The ARMA standard is unambiguous: soft wash only, low pressure, approved chemistry.

What’s included

• Free on-site assessment and written quote
• Gutter and downspout pre-flush to capture runoff
• Plant and landscape pre-soak and drop cloths
• Soft-wash sodium hypochlorite application via 12V pump
• Dwell time so the solution kills at the root
• Low-pressure rinse from the ground or low ladder (no walking on shingles)
• Final landscape rinse to neutralize any drift

How long does roof cleaning last?

A correctly applied soft wash on a Charleston roof lasts 4-7 years before noticeable regrowth. Homes shaded by live oaks or magnolias regrow faster (4 years). Homes with full sun exposure can stretch to 7+ years. We can apply a zinc strip near the ridge that further extends the clean period.

Frequently asked questions

Will sodium hypochlorite hurt my plants? Not when applied with proper protocol. We pre-soak landscaping (which dilutes any drift to harmless levels), use drop cloths, and post-rinse. The chemistry breaks down within hours into salt and water.

Will it damage my gutters? No. We pre-flush the gutters and downspouts so the cleaning solution flows through cleanly. If anything, the gutters will end the day cleaner than they started.

Can you clean a tile or metal roof? Yes — both with adjusted technique. Tile roofs get a slightly different chemistry. Metal roofs are cleaned with a milder solution and longer rinse.

Do you walk on the roof? We avoid it whenever possible. Our soft-wash equipment can reach a 2-story Charleston roof from the ground or a low ladder. Walking on shingles damages them and is unsafe — we don’t do it as a routine practice.

Get a free Charleston roof cleaning estimate

Get a written quote for your Charleston roof. Free, no-obligation, response within 24 hours.