Those black streaks and stains that discolor a home’s roofing shingles certainly are unsightly.
Once you have algae, there are not a lot of good choices to remove it, unfortunately. Power washing does not kill the growth and the high pressure can blast away shingle granules, further weakening the roofing system components whose limestone filler algae feed upon.
One option is low-pressure chemical cleaning, which is done with a small sprayer or sponge. Since this has to be done once or twice a year, however, it is not a permanent solution.
It is not advised that homeowners clean their roof themselves. What’s more, chemicals such as chlorine can be hazardous because they may kill off grass and shrubs below when rinsed from the roofing surface.
So what’s a homeowner to do?
The best offense is always a good defense. That defense can be achieved by installing Atlas roofing shingles featuring Scotchgard™ Protector on your home.
The Atlas roofing shingles prevent algae streaks and stains from appearing in the first place because they use an optimum blend of copper granules that repel algae spores. While competitors use 2-4 percent copper coverage on their shingles, Atlas uses a minimum 10 percent coverage. This allows your shingles to retain their color — and your home its curb appeal.
Each granule starts with a mineral core that is then coated with copper before a ceramic coating is applied over top. They are then evenly dispersed across each shingle.
When homeowners have Atlas shingles with Scotchgard™ Protector installed along with Atlas Pro-Cut® Hip & Ridge shingles featuring Scotchgard™ Protector, they receive the only lifetime limited warranty against algae growth on the market.
The culprit, of course, is a species of cyanobacteria called gloeocapsa magma, commonly known as blue-green algae. Slowly the algae take hold of a roof, typically starting on the north side and other areas where dampness is most present. Feeding on limestone filler, algae then spread and lead to diminished curb appeal and eventually — if left unchecked — potential roof failure.
Think of algae-resistant shingles from Atlas as an investment. Algae can weaken and age shingles prematurely while encouraging the proliferation of other growth such as moss and lichen. The dark pigment from algae also makes one’s home absorb more heat, resulting in potentially higher energy costs.
When your roof is absent of algae, you’re not only protecting your home but you are protecting others’ as well. That’s because algae spores are carried by the wind, bringing infestation from roofing system to roofing system.
Choose Atlas shingles featuring Scotchgard™ Protector and break the cycle of dirty roofs.