Roof Cleaning

What Causes Roof Staining?

The dark streaking commonly seen on asphalt roofs is usually caused by a type of algae that spreads gradually across shingles. This organic growth thrives in humid conditions and often appears first on parts of the roof that receive less sunlight.

While the staining often starts as a cosmetic issue, algae and moss can hold moisture against roofing materials over time. Professional roof cleaning helps remove this buildup and restore a cleaner, more uniform appearance.

Why Soft Washing Is the Right Approach

Many homeowners assume roof cleaning involves high-pressure washing.

In reality, pressure washing a roof can damage shingles and shorten the life of the roof.

Water Works uses a soft washing process that applies specialized cleaning solutions and low-pressure rinsing to safely break down algae, moss, and buildup.

This method allows the roof to be cleaned effectively while protecting the integrity of the shingles and surrounding areas of the home.

Signs Your Roof May Need Cleaning

Your roof may benefit from professional cleaning if you notice:

• Dark streaking across shingles

• Green patches or moss growth

• Staining along roof lines or valleys

• Uneven discoloration across different areas of the roof

Roof cleaning can dramatically improve the overall appearance of a home while helping prevent buildup from spreading further.

Roof Cleaning for Homes Across Greater Boston

Water Works provides professional roof cleaning services for homeowners throughout Greater Boston, MetroWest, and the South Shore.

Before beginning any project, we carefully evaluate the roof and surrounding landscaping to determine the safest and most effective cleaning approach.