We re in washington state where moss is a problem even on a metal roof.
Metal roof moss control.
Thoroughly soak moss but avoid runoff.
Apply by sprinkling can hose end tank sprayer.
I know a sacrificial zinc rod can be used on asphalt shingle roofs to create an unfriendly environment for moss but i suspect the dissimilar metals would cause galvanic problems on a metal roof.
Moss can the moss.
The copper ridge is a unique product that is manufactured to prevent roof moss growth.
Zinc and copper strips.
Use a scrub brush on a pole and push the brush down the roof surface to force the moss from the roof.
With each rain zinc is released from the strip and kills the mosses below the strip.
And all infected areas on the roof such as skylights vents and stop the moss from smothering your lawn grass by learning how to control it.
As it rains the metals leach down on the roof and suppress moss growth.
Scrape off the moss.
Moss does not stick to metal.
The active ingredient is metallic zinc.
A wood saw is ideal for this task.
A light rain on the roof will cause the moss killer to flow downward and cover all areas of the roof.
Dry powder moss killer is activated and dispersed by precipitation.
These operate under the same principal as the moss killers.
Step 3 keeping the moss off.
Lightly spraying the roof with water is another way to accelerate this process.
For best results remove the existing mosses prior to treatment.
Don t brush in an upward motion or you may damage the bond between layers of shingles.
Apply at the rate of 3 gallons of mixture to 100 square feet of moss area.
To remove this moss we then apply the treatment to the roof.
You can also use zinc or copper strips installed on the ridge of the roof.
Zinc chloride zinc as metallic 29 6 percent solution mix 1 pint zinc chloride in 3 gallons of water.
Apply the rolled zinc or galvanized flashing to each side of ridge caps along the roof peaks.
These work well on simple roof lines with sound pitches 4 12 and steeper roofs.
Nail at one foot spacings along the zinc strip.
Zinc chloride is corrosive to metals and injurious to plants.