Sprinkle a product that contains the main ingredient zinc sulfate over the moss you wish to kill.
Zinc sulfate roof moss.
To use zinc sulfate one can apply powder directly to moss areas.
As rain runs over the strips zinc drips down your roof.
The active ingredient for some moss killers is zinc sulfate monohydrate usually at concentrations of 99.
Zinc strips can be installed at the top of your roof to prevent moss from growing.
One brand name is moss b ware.
Among the products to use with caution are zinc potassium salts of fatty acids and oxidizing bleaching agents that do not contain chlorine.
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According to the manufacturers zinc sulfate will not stain roofs or corrode aluminum and galvanized gutters.
Moss is more than just ugly it can dam and divert water runoff causing water to leak into your home.
The technique most roofing contractors use when putting a zinc sulfate or zinc chloride compound is conducive to killing moss in patches creating a dalmatian like pattern.
It will also corrode all of your fasteners allowing water to get underneath your shingles causing costly roof leak repairs.
However while mixing and spraying a zinc sulfate solution you must be careful to protect the surrounding vegetation and watershed.