What causes the black streaks on my roof?

Those streaks are a blue-green algae called Gloeocapsa magma, not dirt or ordinary staining. It thrives in the warm, humid Georgia climate, feeds on the mineral filler in asphalt shingles, and spreads by airborne spores from one roof to the next. It takes hold first on shaded, north-facing slopes where moisture lingers. Soft washing removes it at the root, which is why the streaks do not simply wipe or rinse away.

Will cleaning my roof damage the shingles?

It depends entirely on the method. Pressure washing can blast the protective granules off asphalt shingles and even void the manufacturer's warranty, which makes it the wrong tool for a roof. Soft washing uses a low-pressure application of a cleaning solution instead, so it clears the algae without harming the shingles. Summit Roofing soft washes rather than pressure washes, which is the method shingle manufacturers call for.

How much does roof soft washing cost in Marietta?

It depends on the size and pitch of the roof, how much algae and moss has built up, and how accessible the roof is. Because those vary from home to home, Summit Roofing provides a free assessment and a written estimate rather than a flat rate. Soft washing is almost always a small fraction of what granule loss from a pressure washer, or an early replacement, would cost.

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