Starting in 2010 I began conducting fairly long-term experiment by installing zinc strips on a moss-covered garage roof, and showed before and after photos after the zinc had 16 months to work its ...

The silver-grey strips on each side of this roof ridge are made of zinc. Small amounts of this non-toxic metal dissolve in rain and wash down the roof, reducing or eliminating moss and lichen growth.

Zinc strips are also supposed to be effective at preventing black stains from showing up on the roof. I'm starting a long-term experiment on my own house; I'll report back with the results in a ...

In the meantime, kill the moss by dousing it with vinegar. In a day or two, wet the moss, then scrape it off with a wood scraper or roof rake (carefully). You can keep the moss (and mold and algae ...

A: A zinc or copper strip that it attached to the roof just below the hip or ridge can be found in the roofing section of most hardware stores or home centers. The product can also be found at ...

When the strips come into contact with rain water, zinc oxide - a fungistatic and drying agent - is released, inhibiting the growth of mildew (fungus), moss and algae. A 3-foot section is $2.95.