Algae-Resistant Shingles: What Colorado Homeowners Need to Know

If you’re dealing with dark streaks on your shingle roof, there’s a good chance it’s algae—not dirt. In Colorado’s mix of sun, shade, and moisture, algae growth is common on asphalt roofs, especially on north-facing slopes.

Algae-resistant shingles offer a simple, long-term solution.

What Are Algae-Resistant Shingles?

Algae-resistant (AR) shingles are asphalt shingles with added copper or zinc granules. These metals stop algae from growing on the shingle surface.

• Copper granules are most commonly used.

• These granules release ions when wet, which disrupt algae growth.

• They’re built into the shingle—not applied later—so they last as long as the shingle does.

Why Algae-Resistant Shingles Matter in Colorado

Colorado’s climate is dry—but many neighborhoods still deal with algae problems. The culprits?

• Sprinkler systems spraying roof edges

• Shaded roof areas (especially in Denver, Lakewood, and Fort Collins)

• North-facing slopes with limited sun exposure

Without protection, blue-green algae (Gloeocapsa magma) can leave dark streaks across your roof that:

• Lower curb appeal

• Accelerate aging of shingles

• Trap moisture and increase mold risk

• Potentially impact insurance claims or real estate sales

How Long Do Algae-Resistant Shingles Last?

Algae resistance typically lasts 10 to 15 years, depending on:

• The percentage of copper granules

• Roof pitch and orientation

• Local weather patterns

Some premium shingles include higher concentrations of copper and offer limited lifetime warranties for algae resistance.

Are Algae-Resistant Shingles Worth It?

In most Colorado neighborhoods, yes. While they cost slightly more than standard asphalt shingles, the benefits often outweigh the extra cost:

• No need for repeated roof cleanings

• No risk of damaging your shingles with bleach or pressure washing

• Longer-lasting roof appearance

• Enhanced resale value

For HOAs or commercial properties (like in Arvada or Westminster), algae resistance is a must for maintaining visual standards.

Maintenance Tips for Algae-Resistant Roofs

• Keep gutters clean: Prevent runoff and water accumulation.

• Trim overhanging branches: Sunlight helps dry the roof.

• Avoid power washing: It can void warranties and damage shingles.

• Use zinc or copper strips at the ridge to extend algae protection.

FAQ: Algae-Resistant Shingles

What causes roof algae in Colorado?
Moisture, shade, and organic debris. Sprinklers and tree cover are common triggers.

Can I add algae resistance to an existing roof?
Not reliably. Field-applied treatments don’t last and may void the manufacturer’s warranty.

Do algae-resistant shingles come in all styles?
Yes. Most major brands offer algae-resistant options in architectural and designer styles.

Are these shingles more eco-friendly?
They reduce the need for chemical cleanings and extend roof life, making them a greener choice.

Need help deciding if algae-resistant shingles are right for your home or commercial building in Denver, Colorado Springs, or Pueblo?

Call Roof Nuts today at 303-276-2403
Or request a quote at https://RoofNutsCO.com

We’ll inspect your roof and recommend the best protection based on your exposure and budget.