To knock the moss back now you may consider chemical control.
Pet safe roof moss killer.
Make a 3 percent soap solution by mixing 1 ounce of lemon scented liquid dish soap with 1 quart.
Below is a list of some common household items that are bases.
Easily clean roofs from black streaks and heavy moss wet forget is safe on any type of roof.
To apply dry powder moss killer place an extension ladder against the house and climb to the roof.
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Iron solutions are less toxic though not entirely harmless but they can permanently stain roof shingles decks siding and lawn furniture as well as concrete walkways.
Vinegar is an acid and can damage some surfaces.
Do not allow the vinegar or vinegar mixture to touch any plant growth you wish to keep.
Iron sulfate or ferrous ammonium sulfate may be a good option as long as you follow the label directions closely.
Dispense the moss killer in lines about 2 feet apart parallel to the roof ridge.
Vinegar can be used as an herbicide and pesticide.
After granules or sprays have a chance to break up and penetrate the soil or moss layer there is a lower potential for exposure to the pets.
Moss killers based on zinc or copper create toxic runoff that can harm fish and aquatic life as well as people in high enough concentrations.
Safe on all surfaces roof cleaner ox can also be used as a metal roof cleaner.
Wet and forget is as simple as spraying your outdoor surface and forgetting it.
Non toxic environmentally safe roof fungus shingle cleaner has no harmful by products and will decomposes into water oxygen and soda ash.
Activated by water roof cleaner ox releases oxygen roof cleaning power and roof fungus mold and moss stain removal.
Since moss grows in a ph environment of 5 0 5 5 or 6 0 by changing the environment to a base level it will effectively kill the moss.
Spot treat small patches of moss with common household items that won t negatively affect your pet.
To apply wet moss killer attach the garden hose to the container.
However iron and sulfur are low in toxicity at low doses.
Mix the baking soda and water in a spray bottle and shake until the solution is well mixed.
Apply the moss killer.
Maintain a consistent flow of moss killer down the line.
Run the water for a moment until the moss killer begins to flow out.
You want to soak the moss so apply enough cover it thoroughly.
To prevent moss growth spray an area with vinegar.
Test any surface prior to applying.
This page about chemical control of moss in lawns was written by some osu experts but be aware that glyphosate will kill your grass.
Walk around spraying any moss patches with your natural moss killer for lawns.
To minimize risk to pets follow label directions and minimize their exposure.
Vinegar will kill any plant life.
1 quart of warm water.