Though apparently effective for a limited time Practical Pressure does not promote the use of zinc strips to prevent roof moss because they seem to lose their effectiveness. As you can see here the moss has actually begun growing on the zinc strip itself. So after the zinc stops preventing moss you are left with rather unattractive and worthless pieces of metal on your roof surrounded by flourishing moss patches. Not a very desirable result to most. The number of roofs with zinc strip previously installed and which we've cleaned moss off of is way to many to feel good about this method of moss prevention.
Practical Pressure does however strongly recommend that moss control take place before it ever grows on your roof. It is much better to prevent moss from ever growing on your roof than to end up needing to clean moss off of your roof later. To see an in-depth discussion of this recommendation please refer to: Prevention is the Key
In this picture and the one below you can see that above the zinc moss is growing unrestrained, directly underneath the strip the growth is hindered and just a couple of feet down it is flourishing. So zinc does make a difference but it is for a short duration and generally is not potent enough to curb the growth to a reasonable extent, at least not enough to merit the trouble and expense. Zinc does work very well at preventing moss but the powdered or granulated form which you can apply annually or as needed is far more effective. It is cheaper, you are spared the unsightly look of old zinc strips running across your roof and you don't put unnecessary holes in your roof by nailing it down.
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Professional Pressure Washing Services
"Keeping the Green State in a Clean State"
We provide cleaning services for western Washington. Practical Pressure is based in Tacoma WA and cleans in the following cities and towns.
Seattle, Tacoma, Lakewood, Steilacoom, Lacey, Tumwater, Olympia, Kent, DuPont, Auburn, Black Diamond, Puyallup, Bellevue, Renton, Federal Way, Milton, Spanaway, Graham, Bremerton and more.
Our services include roof cleaning (tile, shake and composition) maintenance and repairs as well as moss removal and moss prevention. We power wash decks, driveways, siding, gutters (we also do gutter cleaning), and just about anything else that you may want cleaned.
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