Big Easy Roofers has released a homeowner's guide on safe asphalt shingle cleaning, drawing on standards set by the Asphalt Roofing Manufacturers Association, GAF, and Owens Corning to address what the contractor describes as a consistent source of preventable shingle damage across the region. The guide covers approved cleaning chemistry, pressure thresholds, DIY safety criteria, and the scenarios that require a licensed professional rather than a homeowner-led approach.
At the center of the resource is soft washing, the method ARMA formally endorses for asphalt shingle maintenance. The technique applies a diluted sodium hypochlorite solution at 50 to 150 pounds per square inch, roughly the output of a standard garden hose, which kills algae, moss, and lichen organisms at the cellular level without physically disturbing the granule surface of the shingle. The guide specifies a 50-50 blend of household bleach and water as the correct solution ratio, applied with a pump sprayer on an overcast day, left to dwell for 15 to 20 minutes, and rinsed from the top down with a garden hose at normal pressure. It also notes that application should move from the bottom of the roof upward to prevent runoff from marking already-cleaned sections, with the final rinse moving from the top down.
Pressure washing at 1,500 pounds per square inch or above is identified as the single most destructive cleaning method available to homeowners. At that force, granules separate from the asphalt mat, shingle edges lift, and warranty coverage from major manufacturers is frequently voided. The guide notes that granule loss from pressure washing is typically invisible from street level, meaning the damage compounds over months before it becomes apparent. Abrasive tools including wire brushes and stiff-bristle scrubbers cause the same category of granule removal and are identified as equally damaging when used on any asphalt shingle surface.
A company spokesperson addressed the warranty dimension directly. "Most homeowners assume cleaning is maintenance and maintenance protects the warranty," the spokesperson said. "In reality, using the wrong method is a warranty event. Some manufacturers require certified contractor documentation for any cleaning work, and that requirement is buried in the fine print most people never read."
The guide also identifies the organism responsible for black roof streaking, a cyanobacterium called Gloeocapsa magma that feeds on the limestone filler in asphalt shingles and spreads through airborne spores. Gulf Coast homes are particularly susceptible because the humid subtropical climate and heavy tree canopy coverage accelerate biological growth cycles on roofing surfaces. Homeowners seeking a preventive solution after cleaning are directed toward zinc or copper strip installation along the roof ridge line, which releases trace metal ions during rainfall that inhibit algae and moss regrowth on shingles below. The guide identifies this option as most effective on new roofs or immediately following a thorough soft wash treatment.
Four conditions are outlined as thresholds that move a job beyond safe do-it-yourself work: roof pitches steeper than 6 in 12, structures taller than one story, established moss or lichen colonies with root systems that have penetrated between shingle layers, and roofs under active manufacturer warranties that specify certified contractor requirements. For that last category, the guide notes that professional documentation may be required not only for the current warranty period but for any future claims filed against the roof during its remaining coverage window.
Big Easy Roofers recommends homeowners schedule a professional inspection before any cleaning attempt on roofs that have not been assessed in the prior 12 months, as cleaning a roof with existing granule loss, cracked shingles, or compromised flashing can accelerate damage that might otherwise qualify for a repair or warranty claim.
Big Easy Roofers provides soft washing, residential and commercial roof inspections, repairs, and full replacements. The company can be reached at 504-285-5135 or through bigeasyroofers.com. The company serves Florida and Louisiana residents and businesses.
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For more information about Big Easy Roofers, contact the company here:
Big Easy Roofers
Ron Keener
(504) 285-5135
info@bigeasyroofers.com
625 Celeste St, Suite 504-J,
New Orleans, LA 70130