What is on my roof?

What is on my roof?

Those ugly black streaks and stains on your roof shingles, although appearing to be some sort of roof mold, are actually a hardy species of algae called Gloeocapsa Magma. It’s become more of a problem in the last several years because shingle-makers now use limestone filler in the manufacturing process, which is actually a food source for the algae. So, the algae is quite literally eating the roof shingles, quite possibly resulting in a shortened lifespan of your roof. This type of algae can be extremely difficult to remove if the correct chemicals and methods are not used.

There are other types of organic growth that can form on a roof other than roof algae (or mold). There’s also the possibility of lichen or moss growth. Lichen is usually a whitish color, but it can also have tones of green, yellow, and brown. It often forms in patches of individual circles, each averaging about the size of a dime. It’s also noticeably raised from the surface, unlike the black algae stains.

Roof moss, on the other hand, almost always has a green color and if left untreated for several years will become so thick it will be noticeable from the ground. In severe cases the roof moss can actually look like green carpet on the roof. Roof moss can severely affect the value of your property since the unsightly growth decreases the curb appeal of the property. This is unfortunate because, in most cases, roof moss is very easy to remove.

Whether your roof has roof algae, roof mold, or roof moss it is extremely important to remove it in a timely and safe manner in order to preserve the life of your roof.


What is on my roof?

Sample of Roof Algae — a/k/a Gloeocapsa Magma

What is on my roof?

Sample of Roof Lichen

What is on my roof?

Sample of Roof Moss