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The Truth About Zinc Strips
Many roof cleaning companies will offer to install zinc strips on your roof for a hefty price tag. The question is, are they really worth it? Do they actually work? Many times the zinc strips are sold with a promise that the moss will not come back for 5-7 years. Let's see if this is really true.
Here is a picture of a roof showing the outcome of zinc strips after just a few years. This person in particular was sold the zinc strips claiming that she would be moss free for 7 years. As you can plainly see, it didn't take the moss very long to grow back. Even when the zinc strips are installed correctly, in most cases they are not, the moss killing properties only covers a few feet below the strip (as seen in the picture). After awhile the zinc strips curl and wear, losing their moss killing value.
Not only are zinc strips expensive but application is more detrimental to the roof than helpful. Let me explain. In order to install the zinc strips, a layer of shingles have to be raised, breaking the waterproof seal. Next, nails are driven into the roof to hold the zinc strips in place. These nails are inadvertently creating new holes in your roof. Finally when the strips wear out, which inevitably they will, they have to be torn out so that new strips can be installed. This involves driving more nails into your roof and creating new holes. Repeat this process a few times and you can end up with a roof leak quickly. The purpose of the roof is to keep the elements from getting inside, yet breaking seals and creating holes is what is necessary to install zinc strips in the first place. It just doesn't make sense. There is another viable solution.
We do not recommend the installation of zinc strips. We recommend hand brushing in order to preserve the life of the roof. A professional company can remove the moss without damaging the roof.