Black Mold On Slate Roof

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Black mold on slate roof.

Once turned into roofing material slate absorbs water and can naturally de laminate during the freeze and thaw cycles of winter. What are those ugly black streaks on my roof. At worst they can pose serious health risks. The black streaks are also known as black algae or roof mold.

At best slimy black mold deposits are an eyesore. 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. The black mold like stains and streaks that appear on roofs particularly light colored asphalt shingles is actually a blue green algae gloeocapsa magma. Commonly found in climates with warm humid summers it does no damage to the roofing but it certainly does looks bad.

Like all tile however slate can be prone to mildew and mold particularly if it is installed in a high moisture area like a bathroom a basement or a kitchen. For this reason it works as well on a tiled roof as it does on a bathroom floor. Slate is a sedimentary rock with miniscule layers that easily cleave. Slate is one of the most durable and popular materials used in construction.

Those that tend to be the most humid furthermore they will only appear on the north side of the roof. Technically the black streaks on roofs are a form of algae known as gloeocapsa magma. The most common type is known as gloeocapsa magma also known as blue green algae. 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.