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Roof Cleaning questions, answered by experts

If you’re asking yourself, should you pressure wash your roof, the answer almost always is no. The water pressure that the power washing machine generates could damage the shingles by forcing water underneath or causing them to loosen. Soft washing with a pump sprayer is the better and safer option.

On average, cleaning a roof will take between two to five hours. This timeline depends on the size and slope of your roof and the severity of any stains. Cleaning roof stains can take additional time, especially if there are signs of moss or algae.

In addition, the age of your roof makes an enormous difference in the time it takes to clean it, as older roofs need more gentle care. If you have significant landscaping in your yard by your house, your professional roof cleaner will need additional time to protect it from cleaning chemicals.

No, asphalt shingles should not be power washed. A power washer or pressure washer is too strong to use on asphalt shingles and will loosen the adhesive holding them to your roof, causing them to fall off. It’s best to hire a local roof cleaner to clean those shingles safely and without damaging them. 

To maintain metal roof health, schedule regular inspections, clear debris from gutters, and check for signs of corrosion.

Regular cleaning, inspecting for peeling or rust, and reapplying coatings every 8-12 years helps maintain durability.

The Holland Patent, NY homeowners’ guide to roof cleaning services

From average costs to expert advice, get all the answers you need to get your job done.

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  • 🌱 "Mow a small front yard"
  • 🛠 "Fix a leaking pipe under the sink"
  • 🏠 "Repair shingles on an asphalt roof"