Using shingles that have been treated with algicide keeps the growth at bay for about 10 years thus the 10 year algae warranty.
How to clean roof shingles from the ground.
One day you may notice that your roof is turning black or fungus is spreading across of it.
After spraying the roof with the mixture allow it to sit on the surface for 15 to 20 minutes before rinsing thoroughly with clean water.
Some of this growth including the stains from algae spores.
This is the best way to clean a roof if you have asphalt shingles.
How to clean roof shingles.
Start at the lower portion of the roof moving up as you clean each lower section.
Spray the cleaner on a section of roof and let it sit for about 15 minutes.
Use the sprayer to saturate a strip 3 feet high x 10 feet wide.
But once the algicide wears off your roof hosts an all you can eat buffet for the neighborhood algae spores.
Proper cleaning is an important step in roof maintenance.
But of course if the roof is really bad i may have to walk the roof with a power washer but set at a very low pressure about 400 psi about 12 inches away.
This can be done either while walking the roof or some hi tech equipment i have i can actually spray it from the ground without ever getting on the roof.
Cleaning roofs is slippery work.
It can also be referred to as low pressure or soft washing.
Do it yourself and save big bucks.
That way you always stand on dry surface and reduce the chance of slipping.