These kinds of organic growth will degrade cedar roofs much faster than a lot of other roofing issues.
Fungal growth on roof shingles.
Known as black algae or roof mold gloeocapsa magma is usually blamed on dirt accumulation mold and mildew or defective shingles.
Algae resistant shingles or ar shingles for short began when shingle manufacturers looked for ways to gain market share.
It is easily spread and causes those colorful stains on so many roofs.
On an asphalt or possibly some treated wood shingle roofs shingle chemistry is also involved in moss lichens and algae growth or resistance to it.
Scrubbing or power washing the lichen will only do more damage.
They call it the algaeblock system.
It s actually just a blue green algae spread by airborne spores.
Some moss or fungi development you may see are dark brown or black spots that weaken shakes or shingles.
Most of the stains on the average atlanta roof are the result of algae and not fungus.
Once on the roof lichen cannot easily be removed.
Even if it dries out it can come back to life when rain or moisture appears.
You can find more information on these special roofing shingles here.
This unique advance in shingle technology gives long term fungus protection for the entire roof.
It is important that the product you choose to clean the moss growth does not damage or weaken the cedar itself.
However most of the anti algae products also work in fighting fungal growth.
Lichen is a photosynthetic fungus that has roots that wrap around the granules feeding on the nutrients of the gm and the filler in the shingles.