Black Mold On Slate Roof

Commonly found in climates with warm humid summers it does no damage to the roofing but it certainly does looks bad.

Black mold on slate roof.

It s easy to let a mold problem sneak up on you on in out of the way places like the roof of your home. Those that tend to be the most humid furthermore they will only appear on the north side of the roof. Believe it or not those black streaks only appear on roofs in certain areas of the country. Although these dark spots and ugly black streaks on your roof may look like dirt mildew soot or mold what they really are is algae.

Slate is a sedimentary rock with miniscule layers that easily cleave. Just because you can t see it however doesn t make it any less dangerous. Once turned into roofing material slate absorbs water and can naturally de laminate during the freeze and thaw cycles of winter. At worst they can pose serious health risks.

That s why if. The black streaks are also known as black algae or roof mold. For this reason it works as well on a tiled roof as it does on a bathroom floor. This quality is what distinguishes slate as a suitable roofing material.

Technically the black streaks on roofs are a form of algae known as gloeocapsa magma. The black mold like stains and streaks that appear on roofs particularly light colored asphalt shingles is actually a blue green algae gloeocapsa magma. What are those ugly black streaks on my roof. The most common type is known as gloeocapsa magma also known as blue green algae.