Professional Roof Cleaning in Stratham, NH – Adding Curb Appeal & Extending Roof Life

What was wrong with this Stratham roof?

There was nothing structurally wrong with this roof — the shingles were still in good shape. The problem was cosmetic, and it had crept up on the homeowner over several years. Dark algae streaks and patches of moss had spread across the surface to the point where the roof looked a decade older than it actually was. From the street, a perfectly serviceable roof was dragging down the look of the whole house.

Why do roofs in the Seacoast get so stained?

The damp, shaded, humid conditions around Stratham and the rest of the New Hampshire Seacoast are close to ideal for roof growth. The black streaks most people notice are a hardy blue-green algae called Gloeocapsa magma, and the green fuzzy spots are moss. Neither is just an eyesore:

• Moss holds moisture against the shingles and can lift and separate the edges over time
• Algae feeds on the shingle filler and slowly contributes to granule loss
• Both shorten the usable life of an otherwise healthy roof

In other words, leaving it alone is not a neutral choice — the growth keeps working on the roof.

How did Compass Exteriors clean the roof?

We cleaned this roof using a soft wash combined with a disc rinse. We do not power wash shingles — high pressure tears off the granules that protect the asphalt and voids most shingle warranties. Instead, the process looked like this:

• A gentle, low-pressure soft-wash application of a cleaning solution that kills moss, algae, and lichen down at the root rather than just rinsing the surface
• A controlled disc rinse to lift and flush the dead growth off the shingles evenly, without the force of a pressure washer
• Care taken around landscaping, gutters, and surrounding surfaces throughout the job

What did the roof look like afterward?

The difference was hard to believe. The streaking and moss were gone, the shingles’ real color came back, and the house looked years newer — all without the cost of a replacement. Just as important, killing the growth at the root stopped the slow damage it had been causing, so the homeowner gets to use the full remaining life of the roof they already paid for.

Why not just power wash it yourself?

This is the question we get most often, and it is worth answering plainly. A pressure washer aimed at a roof will absolutely make it look clean for a day — while blasting off the protective granules that give asphalt shingles their lifespan and their fire and UV resistance. Once those granules are gone, they do not come back, and you have traded a cosmetic problem for a structural one. Beyond that, walking a wet, steep, moss-slick roof is genuinely dangerous, and most shingle manufacturers spell out that high-pressure washing voids the warranty. The soft-wash-and-disc-rinse approach exists precisely so the roof gets clean without any of that downside. It is slower and more deliberate than blasting it, but it is the only method we will put our name on.

Roof cleaning in Stratham, NH

If you are around Stratham or anywhere on the Seacoast and your roof has black streaks or moss building up, a professional soft wash is one of the cheapest ways to protect your investment. It restores curb appeal, buys you more years out of your shingles, and is a smart move before listing a home for sale. Learn more about our roof cleaning services or see other Stratham projects.