If you’ve noticed black streaks, moss, or lichen on your roof, you’re not alone. Homeowners across the Lehigh Valley and nearby New Jersey towns see this same problem every year. Our region’s humid summers, shaded yards, and proximity to the Delaware River create the perfect environment for algae and moss to grow, and once they take hold, they won’t go away on their own.

The good news? With the right approach, you can restore your roof’s appearance, extend its lifespan, and protect your home’s value.

What’s Causing Those Black Streaks?

Most of the dark stains you see on asphalt shingles are caused by a type of algae called Gloeocapsa magma. It feeds on the limestone in your shingles, which not only leaves unsightly streaks but can also weaken your roof over time.

In shaded or tree-covered areas, you might also find:

• Moss – Traps moisture and lifts shingles.

• Lichen – A stubborn growth that can damage roofing material if left untreated.

Why Soft Washing Is the Only Safe Method for Roof Cleaning

High-pressure washing might seem like a quick fix, but it can cause permanent damage by removing the protective granules from your shingles. The safest, most effective option is soft washing, a low-pressure application of specialized cleaning solutions designed to:

• Kill algae, moss, and lichen at the root.

• Preserve the integrity of your shingles.

• Keep growth from returning as quickly.

How Often Should You Clean Your Roof?

For most homes in Nazareth, Bethlehem, Allentown, and surrounding areas, we recommend professional roof cleaning every 2–3 years. You may need it more often if your home is:

• Surrounded by large trees.

• In a shaded area that stays damp.

• Near water sources like rivers or lakes.

Can Roof Cleaning Help with Insurance Claims?

Many homeowners don’t realize that roof maintenance plays a role in insurance coverage. If your roof is damaged and it’s clear that neglect or algae growth contributed to the problem, your insurance company could deny your claim.

Professional roof cleaning keeps your shingles in good condition, helps prevent damage, and provides documented proof that you’ve been maintaining your home, which can be valuable if you ever need to file a claim.

Benefits of Professional Roof Cleaning

• Extends Roof Life – Prevents damage that leads to early replacement.

• Boosts Curb Appeal – A clean roof instantly improves your home’s overall look.

• Protects Your Investment – Helps avoid costly repairs.

• Keeps HOA Compliance – Many neighborhoods require well-maintained exteriors.

Why Homeowners Choose Pressure Brothers

We have been serving the Lehigh Valley and western New Jersey for 15 years, and our certified technicians are trained to handle your roof with care. We use only safe, proven methods to protect your shingles while delivering noticeable, long-lasting results.

From the first call to the final rinse, our team is committed to excellent communication, professional service, and results you can see.

Ready to Restore Your Roof?

If your roof is showing signs of algae, moss, or lichen, now is the perfect time to take action. Contact us today for a quote and see why so many homeowners in your area trust Pressure Brothers for their roof cleaning needs.

Request your quote here: Book Your Roof Cleaning

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Nazareth, Bethlehem, Allentown, Easton, Saucon Valley, Center Valley, Williams Township, Forks Township, Palmer Township, Hellertown, Coopersburg, Phillipsburg NJ, Stewartsville NJ, Milford NJ, Harmony Township NJ, Greenwich Township NJ.

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