Roof Algae: What It Is & How to Get Rid of It

frankt298
Aug 12
2 min read

If you’ve noticed dark streaks or stains spreading across your shingles, you might assume it’s mold. In reality, most “roof mold” is actually roof algae — and while it may not eat through your shingles like rust or rot, it can still cause serious problems for your home’s curb appeal, efficiency, and lifespan.

The good news? With the right roof mold removal process, you can eliminate the problem safely and keep it from coming back.

What Is Roof Algae?

Roof algae is a type of plant-like organism — most often Gloeocapsa magma — that thrives in warm, humid climates. It feeds on the limestone filler used in many asphalt shingles, leaving behind unsightly dark streaks that grow over time.

Many homeowners confuse roof algae with mold, moss, or mildew because of its appearance. While the organisms are different, the end result is the same: an ugly roof that makes your home look older and poorly maintained.

Why You Shouldn’t Ignore It

Letting roof algae grow unchecked can cause more than cosmetic issues:

Shingle Damage: The algae feed on your shingles’ filler material, reducing their lifespan.
Moisture Retention: Algae holds water on the surface, encouraging moss growth and potential leaks.
Energy Loss: A dark, algae-covered roof absorbs more heat, driving up cooling costs.
Property Value Impact: Curb appeal matters — and a streaky, stained roof can turn away buyers.

Why DIY Methods Fall Short

Some homeowners try to tackle roof mold removal themselves using a pressure washer or harsh chemicals. These methods can cause more harm than good:

High pressure washing strips away shingle granules, voiding warranties.
Bleach-heavy solutions can kill plants, damage siding, and harm pets.
Without treating the root cause, algae will return — often in just a year.

The Professional Approach to Algae Removal

At Certified Softwash Solutions, we use a low-pressure softwashing system designed for safe, effective algae removal.

Our process:

Inspection: We identify the extent of the algae and check for other growths like moss or lichen.
Eco-Friendly Treatment: Our biodegradable cleaning solution kills algae at the root without harming your roof, landscaping, or pets.
Low-Pressure Rinse: Gentle water pressure washes away dead algae without damaging your shingles.
Prevention Plan: We offer maintenance schedules to keep your roof algae-free for years.

Why Softwashing Works Best

Softwashing isn’t just a quick fix — it’s the long-term solution.

Kills at the root: Stops regrowth faster than surface-only cleaning.
Preserves materials: No granule loss, cracking, or shingle damage.
Environmentally safe: Biodegradable solutions protect your plants, pets, and property.
Longer-lasting results: Roofs stay clean up to 4–6 times longer than with pressure washing.

How to Spot Roof Algae Early

Catch algae before it spreads by looking for:

Light brown or greenish stains near the roof peak
Thin, dark streaks on north-facing slopes
Areas shaded by trees or structures that hold moisture longer

The sooner you call for roof mold removal, the easier (and cheaper) it is to restore your roof.

Protect Your Roof and Your Home

A clean roof isn’t just about appearance — it’s about protecting one of your home’s biggest investments. Whether you call it algae, mold, or “those black streaks,” Certified Softwash Solutions can remove it safely and keep it from coming back.

🌐 Learn more at https://www.certifiedsoftwash.ca/roof-cleaning