Yes — zinc and copper strips can help slow or prevent moss growth when installed correctly, but they are not a standalone solution. Their effectiveness depends on roof design, rainfall, and overall maintenance.

This guide explains how zinc and copper strips work, what they can (and can’t) do, and whether they’re worth it for Southern Oregon homes.

How Zinc and Copper Strips Work

Zinc and copper strips are typically installed near the roof ridge. When it rains, small amounts of metal ions wash down the roof surface.

These ions:

• Create an environment that inhibits moss, algae, and lichen growth
• Help slow regrowth on clean shingles
• Work gradually over time, not instantly

The National Roofing Contractors Association (NRCA) acknowledges metal strips as a preventive option when used properly.

Zinc vs. Copper (What’s the Difference?)

While both metals work similarly, there are important differences:

Zinc Strips

• More affordable
• Effective in mild to moderate moss conditions
• Typically last 5–10 years
• Less visible from the ground

Copper Strips

• More expensive upfront
• Longer-lasting (often 20+ years)
• Stronger resistance to moss and algae
• More noticeable appearance

Copper tends to perform better in heavy shade and high-moisture areas, which are common in the Rogue Valley.

What Zinc and Copper Strips Can’t Do

It’s important to set realistic expectations.

Zinc and copper strips:

Do not remove existing moss
Do not work well on heavily shaded or debris-covered roofs alone
Do not replace regular inspections or maintenance

They work best after moss has already been removed and as part of a broader prevention plan.

Are the Strips Worth It in Southern Oregon?

For many homes, yes — especially when combined with proper maintenance.

Zinc or copper strips can be especially helpful if:

• Your roof has recurring moss in the same areas
• Mature trees shade your home
• You want to reduce how often moss returns

However, roofs with heavy debris buildup or poor drainage may still experience moss growth without additional care.

Proper Installation Matters

Incorrect installation can reduce effectiveness or cause cosmetic issues.

Best practices include:

• Installing strips near the ridge line
• Allowing proper exposure for rain runoff
• Avoiding cutting or puncturing shingles improperly

Professional installation helps ensure the strips function as intended and don’t interfere with your roof warranty.

Zinc and Copper Strips and Roof Warranties

When installed correctly, these strips typically do not void roof warranties. In fact, they may support warranty compliance by helping control biological growth.

Improper installation, however, can:

• Damage shingles
• Create leak points
• Raise warranty concerns

Moss growth doesn’t just affect how your roof looks—it can also have warranty implications. Many homeowners are surprised to learn that allowing moss to spread may put them at risk of voiding certain roof warranties. To understand how manufacturers view moss buildup and what that means for your coverage, read our guide on whether moss voids a roof warranty.

Best Results Come From a Combined Approach

Zinc and copper strips work best when paired with:

• Proper moss removal
• Tree and debris management
• Regular roof inspections

For homeowners looking to build a long-term plan, these strategies are covered in our roof moss removal and prevention guide.

Should You Install Zinc or Copper Strips?

Zinc and copper strips are a useful tool — not a magic fix. When paired with proper removal and maintenance, they can significantly reduce moss regrowth and extend roof life.

Still Seeing Roof Moss?

Zinc and copper strips can help slow moss growth under the right conditions—but they’re not a complete solution, especially on shaded or moisture-heavy roofs common throughout Southern Oregon. If moss is already established, strips alone won’t remove it or reverse the damage that’s been done.

At BUX Exterior Cleaning, we focus on safe, proven moss removal and roof-friendly treatments designed to protect your shingles—not just delay the problem. Our approach removes existing moss, helps prevent rapid regrowth, and keeps your roof aligned with manufacturer maintenance guidelines.

If you’re unsure whether strips are enough—or want a long-term plan that truly protects your roof—we’re happy to help.

Request a roof moss assessment and get honest guidance tailored to your home.