Sometimes it can also be caused by an accumulation of mildew mold dirt or defective shingles.
How to clean roof shingles mildew.
While an occasional cleaning might not harm your roof repeated use of harsh chemicals or the erosive effects of pressure washing can damage or shorten the life of asphalt shingles.
Using shingles that have been treated with algicide keeps the growth at bay for about 10 years thus the 10 year algae warranty.
This discoloring can hurt the beauty of your home s curb appeal and the resale value of your home if you have it up for sale.
So it pays to clean your shingles as soon as you spot algae growth.
One day you may notice that your roof is turning black or fungus is spreading across of it.
While an occasional cleaning might not harm your roof repeated use of harsh chemicals or the erosive effects of pressure washing can damage or shorten the life of asphalt shingles.
A few years ago commercial roof cleaning products containing hydrogen peroxide lye were commonly recommended to remove mildew.
Proper cleaning is an important step in roof maintenance.
To clean mold off a roof start by putting on rubber gloves a breathing mask and goggles to protect yourself from the harsh cleaning chemicals.
Some of this growth including the stains from algae spores.
There are several products on the market specifically designed to remove algae stains from roofs such as wet forget outdoor.
Do it yourself and save big bucks.
One way to determine if it s mildew is to put a few drops of chlorine bleach on to the black mark.
Jan 12 2019 how to clean algae or mold off your roof shingles.
They are exposed to wind rain and other weather elements that not only cause dirt to form on the shingles but also mold and mildew.
Mold stains can form on roof shingles that are in permanent shade.
Roof shingles become dirty over time.
These stains will discolor your roof and damage the shingles over a period of time if left alone.
Then use a long handled brush to scour the surface of the shingles and loosen stuck on mold while it s dry and brittle.
Stained shingles take away from the overall neat appearance of the exterior of the home.
If it s dirt the dark stain will remain but if it s mildew the stain will go away.
How to clean roof shingles.
But once the algicide wears off your roof hosts an all you can eat buffet for the neighborhood algae spores.