No — you should never pressure wash an asphalt shingle roof. Roofing professionals are unanimous on this point, and for good reason. High-pressure water forced against shingles causes damage that isn't always visible right away but shortens the life of your roof significantly.
Asphalt shingles are coated with granules that protect the underlying material from UV rays and weather. High pressure — even at moderate settings — strips these granules away. Once granule loss begins, the exposed asphalt degrades rapidly under sun exposure, and the shingle's ability to shed water and reflect heat is compromised permanently. This isn't cosmetic damage — it's structural degradation that leads to premature roof replacement, often years ahead of schedule.
Major shingle manufacturers — GAF, CertainTeed, Owens Corning — explicitly state that pressure washing voids roofing warranties. If you file a warranty claim after pressure washing your roof, expect it to be denied. Manufacturers can identify granule loss patterns consistent with high-pressure damage.
The dark staining homeowners want removed is typically Gloeocapsa Magma — a cyanobacteria that feeds on limestone filler in asphalt shingles. It's a living organism, not just surface dirt, which is exactly why blasting it with water doesn't solve the underlying problem — and why soft washing is the only method that actually eliminates it.
Roof soft washing applies an ARMA-recommended, low-pressure biocide solution — under 100 PSI — that kills the Gloeocapsa Magma organism at the cellular level without touching the granules. The roof is rinsed gently afterward. No stripping, no warranty issues, and results that last 2 to 3 years compared to the temporary appearance improvement (and lasting damage) of pressure washing.
Protect your shingles and your warranty. Call (260) 310-4389 or request a free roof inspection. Learn more about our roof soft wash Fort Wayne service.
Call (260) 310-4389 for ARMA-compliant, shingle-safe roof cleaning.