This will prevent the solution from draining in your direction.
How to keep mold from growing on roof.
Continue spraying until you see runoff then let the chemicals sit for 15 20 minutes to soak in and begin attacking the mold.
Spray the entire roof thoroughly.
Make sure to plant trees far enough away.
If you put up a ridge vent a metal ridge vent that s made of nickel or copper what s going to happen is every time it rains some of that metal gets released and runs down the roof and acts as a mildicide and keeps the roof from building up moss.
Prevent roof mold algae.
Trim trees near the home.
But you can prevent growth.
With regular cleanings you can get rid of the algae before it even becomes an issue and definitely before it gives way to rot mold and mildew.
Obviously the best care is preventative care.
Overgrown trees often spread bacteria onto the roof and cause algae growth.
Start on lowest row of shingles and work your way backwards to the upper part of the roof.