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.
How to keep mold from growing on roof.
Trim trees near the home.
Roof mold and algae usually grow because of moisture and bacterial growth.
Spray the entire roof thoroughly.
Obviously the best care is preventative care.
Here are a few effective ways to prevent future growth once you have gotten rid of mold and algae.
Continue spraying until you see runoff then let the chemicals sit for 15 20 minutes to soak in and begin attacking the mold.
You can t prevent spores of algae and moss or mildew from landing on your roof.
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.
This will prevent the solution from draining in your direction.
Make sure to plant trees far enough away.
Overgrown trees often spread bacteria onto the roof and cause algae growth.