Zinc Strips on Mossy Roof, Four Years Later

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

          

Written By

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 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. Sharlene has worked with Structure Tech since 2000 and Reuben has been contributing to her blog since 2008.

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