Roof Washing That Protects Your Home and Your Coverage
Those dark streaks running down your roof are not just dirt. They are algae, and left untreated they invite moss and lichen to take hold. That growth feeds on your shingles, shortens the life of your roof, and can raise serious concerns with your insurance company. The good news is that a professional roof washing takes care of all of it safely and affordably.
Pressure should never be used on a roof. It cracks shingles, strips away protective granules, and can void your manufacturer warranty. Our roof washing process uses a low-pressure detergent application that kills algae, moss, and lichen at the root without any pressure on the shingles at all. It is the only method recommended by shingle manufacturers, and it is the only method we use.
Insurance Companies Are Paying Attention
More and more homeowners across the Lehigh Valley are hearing from their insurance companies about roof condition. Algae, moss, and lichen growth can raise red flags during inspections and policy renewals. In some cases, visible roof growth has led to increased premiums, required repairs, or even non-renewal of coverage.
A professional roof washing is one of the most affordable ways to keep your roof in good standing with your insurer. It removes the growth that triggers concerns, extends the life of your shingles, and helps you avoid much more expensive problems down the road. If you have received a notice from your insurance company or just want to stay ahead of it, reach out for a free estimate.
How We Wash Your Roof
Plant and Property Protection
Before anything touches the roof, we protect all plants and landscaping around the home. We bag every downspout to collect leftover detergent and prevent it from reaching the grass or garden beds.
Low-Pressure Detergent Application
We apply a specialized detergent to the entire roof surface using a low-pressure method. The detergent is designed to kill all growth on the shingles, including algae, moss, and lichen. No high pressure is ever used on the roof.
Immediate and Ongoing Results
The algae (black streaking) disappears immediately during the wash. Heavier growth like moss and lichen turns bright white after the detergent is applied. Over the following weeks, the dead growth breaks down naturally and washes away with the next good rainstorm. We use this approach specifically to avoid pulling growth off prematurely, which could damage the shingles underneath.
What to Expect
After your roof wash, the black streaking from algae will be completely gone. If your roof had moss or lichen, you will see it turn bright white. That is the detergent doing its job. Over the following weeks, the dead growth will loosen and wash away naturally with rain. There is no need to get back on the roof or do anything extra.
Most roofs stay clean for several years after a professional wash. Homes with heavy tree coverage or north-facing roof sections may see growth return sooner since shade and moisture create a prime environment for algae. We are always happy to take a look and give you an honest recommendation based on your roof's condition.
Where We Wash Roofs
Pick your town to see the roof washing write-up for your area, with notes and FAQs specific to local tree cover, insurance trends, and the neighborhoods we know well.
Bethlehem 18015
Roof washing in Bethlehem, PA.
Easton 18042
Roof washing in Easton, PA.
Whitehall Township 18052
Roof washing in Whitehall Township, PA.
Forks Township 18040
Roof washing in Forks Township, PA.
Palmer Township 18045
Roof washing in Palmer Township, PA.
Nazareth 18064
Roof washing in Nazareth, PA.
Emmaus 18049
Roof washing in Emmaus, PA.
Macungie 18062
Roof washing in Macungie, PA.
Northampton County PA (6 areas)
Lehigh County PA (3 areas)
Warren County NJ (1 area)
Looking for a different service? View all exterior washing services.
What Our Customers Say
"Above and beyond 5-star service! From my initial contact to meeting Ryan for a more than fair estimate, to Robbie's (at the time promised) and crew PLUS Joe's finishing touches, Pr..."
"First time using a pressure washing company and I’m glad I went with these guys. I asked on Facebook for recommendations in the area and about 9 out of 10 people pointed me their w..."
"I had Pressure Brothers come to wash a previous house and roof of mine several years ago, and I’m so happy I had them out to clean my new house recently. After years of neglect and..."
Frequently Asked Questions
Why Choose Pressure Brothers for Roof Washing?
We are a locally owned exterior cleaning company based in Easton, PA, and we genuinely care about doing the job the right way. Roof washing is not something to take shortcuts on. The wrong method can do more harm than good. Our crew is fully trained on low-pressure detergent application, and we never use high pressure on a roof. Every job includes full plant protection, downspout bagging, and a walkthrough to make sure you are happy with the results. We serve the entire Lehigh Valley, the Slate Belt, and Northern New Jersey.
Ready for a Cleaner Home in the Lehigh Valley?
Get a free, no-obligation estimate. Most quotes are returned the same day.
Get Your Free Quote (610) 417-7335Last updated May 2026
