Exterior Cleaning
Roof Washing
The black streaks are algae — and the roof must never be pressure washed.
The black streaks are algae — and the roof must never be pressure washed.
Quick answer: Roof Washing. Southeastern Renovation is a licensed South Carolina general contractor (CLG.127339) serving the Charleston Lowcountry and York County, SC. Work is coordinated by Southeastern Renovation as the general contractor. Licensed trade subcontractors handle work requiring their trade credentials; permit responsibilities depend on the project scope and jurisdiction. Call (843) 718-8177 for an estimate.
High pressure strips the mineral granules off asphalt shingles. Those granules are the roof’s UV protection and a large part of its life, and once they have washed off they are not coming back. A roof cleaned with pressure can look excellent and have years taken off it.
The correct method is a low-pressure soft wash that kills the growth and lets weather rinse it. It looks slower and it is the only method that does not cost you roof.
The streaks themselves are cosmetic in the short term, but the growth holds moisture against the shingle, and anything holding moisture on a roof in this climate is not doing it any favours.
Serving Charleston, Mount Pleasant, North Charleston, Summerville, Goose Creek, James Island, West Ashley, Isle of Palms, Moncks Corner, Hanahan, Ladson, Daniel Island, Johns Island, Park West, Seabrook Island, Kiawah Island, Edisto Island, Folly Beach, Ravenel, Rock Hill, Fort Mill, Tega Cay, Lake Wylie, Clover, York, Indian Land across the Charleston Lowcountry. Part of Southeastern Renovation.
No, not an asphalt shingle roof. High pressure strips the granules that protect the shingle from UV, and that is permanent.
Anyone offering to pressure wash your roof is offering to shorten its life.
An algae that thrives in humid climates and feeds on limestone filler in the shingles. It is cosmetic at first, but it holds moisture against the roof, which is not something you want in this climate.
In this climate, eventually. Treatment kills what is there; the conditions that grew it are still the conditions.
Some roofs get zinc or copper strips at the ridge, which slows regrowth.