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Zinc Strips on Mossy Roof, Four Years Later

By In Zinc Strips On July 8, 2014


In November of 2011 I wrote a blog post about using zinc strips to prevent moss from growing on the roof, or possibly to kill moss.  I conducted a fairly long-term experiment by installing zinc strips on a moss-covered garage roof, and showed before and after photos after the zinc had sixteen months to work its magic.

The results were much better than I had expected.  The first photo, showing the untouched roof from July of 2010, showed a lot of moss growth.

Mossy roof before

The next photo, from November of 2011, showed far less moss.  I used a leaf blower to clean the roof off before taking that photo.

Mossy roof after

It’s been about four years since I installed that zinc strip, and the shingles are going to be replaced soon, so I’m showing a final follow-up photo before that happens.

Mossy Roof four years later

As you can see, it looks like there has been some new moss growth.  Why?  I don’t know.  Perhaps the zinc strips lose some of their effectiveness over time?  Maybe the record amount of rainfall we’ve received this year has made the moss growth worse.  I’m not sure.  The bottom line is that zinc strips certainly help, but it’s tough to say whether they’re worth the extra money.

To read the original post, click here: http://www.structuretech1.com/2011/11/zinc-strips-prevent-moss-growth-on-roofs/

Author: Reuben SaltzmanStructure Tech Home Inspections

          


About the Author

Reuben

Reuben is a second generation home inspector with a passion for his work. He grew up remodeling homes and learning about carpentry since he was old enough to hold a hammer. Reuben has worked for Structure Tech since it was purchased by Neil in 1997, and is now co-owner of the company. Reuben’s favorite customers are the ones who have a lot of questions; he grew up thinking he was going to be a school teacher because he enjoyed teaching others so much. In a sense, that’s a lot of what home inspections are about, so Reuben truly does what he loves. Reuben has an A.A. degree in liberal arts and has attended most of the Building Inspection Technology classes at North Hennepin Community College. Reuben and his wife are the proud parents of two young childen, Cy Alexander and Lucy Nicole, and have a German Shepherd named Stanley. With two young children Reuben doesn’t have much free time, but he still tries to play disc golf as often as possible during the summer. Reuben lives in Maple Grove, MN. Professional Qualifications / Memberships: *ASHI Certified Inspector *President, ASHI Heartland Chapter *Member, Minnesota Society of Housing Inspectors (MSHI) *Licensed Minneapolis Truth-in-Sale of Housing Evaluator *Licensed Saint Paul Truth-in-Sale of Housing Evaluator *Licensed Maplewood Truth-in-Sale of Housing Evaluator *Licensed Hopkins Truth-in-Housing Evaluator *Licensed Robbinsdale Point of Sale Evaluator *Affiliate Member, Southern Twin Cities Association of Realtors

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2 Comments

  • Dan 3 MONTHS AGO

    Well, that explains why I have those strips on my roof...we bought a house with architectural shingles on it and I wondered about those. Anyway, the 2014 moss growth may be due to the unseasonably wet AND cool spring/summer we've had. Or, as you said, they may lose their effectiveness due to surface oxidation. I am leaning to the former because I've seen roof vents on shingles 10+ years old still creating the mildew (black stuff) growth-free wake below them.

  • Mohammad 3 MONTHS AGO

    Very useful information.