If you decide to clean the roof yourself never ever use a power washer even on its lowest setting.
How to clean roof shingles stains.
Not only is using a power washer pretty much guaranteed to void any roof warranties it can damage shingles by causing the protective coating or even the shingles themselves to come off.
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I recently noticed black algae stains on my asphalt roof so this would be a good guide to refer to cleaning it off.
One day you may notice that your roof is turning black or fungus is spreading across of it.
Discard any excess oxygen bleach solution after it has set for six hours.
You can choose to clean only the black areas of the shingles but this may leave an uneven color to the roof.
Clean your roof on a cloudy day to prevent the cleaning solution from drying too quickly.
It s great that there s chemical cleaner that can be used to remove black algea from asphalt shingles.
Cleaning the roof yourself.
Do it yourself and save big bucks.
Proper cleaning is an important step in roof maintenance.
Using shingles that have been treated with algicide keeps the growth at bay for about 10 years thus the 10 year algae warranty.
So it pays to clean your shingles as soon as you spot algae growth.
Not to mention the danger of using a pressure washer on a pitched roof.
Some of this growth including the stains from algae spores.
I had to get out the pressure washer to really clean the roof but needed to use caution to not damage it.
Generally you ll need to point the nozzle of the spraying device toward the shingle you wish to clean then depress the handle.
But once the algicide wears off your roof hosts an all you can eat buffet for the neighborhood algae spores.
After applying the cleaning agent allow it to work its magic for about 20 minutes.
Cleaning the entire roof is recommended for an even appearance.
How to clean roof shingles.