Grey Roof Shingles Turning Black

If you live in a humid area of the country you ve probably seen unsightly dark streaks on asphalt shingle roofs.

Grey roof shingles turning black.

Although algae can be found on all types of roofing it tends to be most common on asphalt shingles. Gloeocapsa has the ability to form a protective darkly pigmented outer coating that shields the algae from damaging uv rays. As the blue green algae accumulate they develop a dark hardened outer coating which results in the black stains you see. When that happens it is generally caused by mildew algae mold or dirt stains.

See proximate cause roof shingle stains types of roof stain by color location probable cause and. Black roof shingles do an excellent job of absorbing the heat from the sun each day. Black brown or gray stains on roofing products due to debris left on the roof surface such as piles of leaves and organic waste from nearby trees. See debris staining roof debris and.

List of the pros of black roof shingles. Leaves twigs and tree bark roof algae stains are seen in nearly eighty percent of the united states in various degrees. This is what makes those unattractive black streaks on your roof. Thus elimination of roof algae may reduce roof fungus and roof mildew accumulation.

Why does this algae appear to be black. So will removing loose debris from your roof shingle deck and gutters. The most common culprit is actually a blue green algae known as gloeocapsa magmathat is spread by airborne spores. Roof shingles are exposed to a lot of wear and tear as extreme heat sun wind and precipitation come into contact with them.

The algae will worsen and become more noticeable each year trapping moisture and causing premature shingle aging and granule loss. Though often attributed to an accumulation of dirt defective shingles mold or mildew. The color helps to retain more heat in the home.