Grey Roof Shingles Turning Black

Though often attributed to an accumulation of dirt defective shingles mold or mildew.

Grey roof shingles turning black.

See debris staining roof debris and. When that happens it is generally caused by mildew algae mold or dirt stains. 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.

The algae feed on the limestone in shingles. Why does this algae appear to be black. It is not uncommon for roof shingles to turn black over time. Although algae can be found on all types of roofing it tends to be most common on asphalt shingles.

As the blue green algae accumulate they develop a dark hardened outer coating which results in the black stains you see. The algae will worsen and become more noticeable each year trapping moisture and causing premature shingle aging and granule loss. So will removing loose debris from your roof shingle deck and gutters. Roof shingles are exposed to a lot of wear and tear as extreme heat sun wind and precipitation come into contact with them.

If you live in a humid area of the country you ve probably seen unsightly dark streaks on asphalt shingle roofs. The most common culprit is actually a blue green algae known as gloeocapsa magmathat is spread by airborne spores. Even the thermal energy with cloudy skies gets picked up with this installation. 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. Gloeocapsa has the ability to form a protective darkly pigmented outer coating that shields the algae from damaging uv rays. The color helps to retain more heat in the home.