Black Marks On Painted Wood Siding Shingles

The iron found in galvanized fasteners as well as some window screens and flashings can cause blue or black stains on cedar.

Black marks on painted wood siding shingles.

Oil based stains actually feed mold. As the blue green algae accumulate they develop a dark hardened outer coating which results in the black stains you see. Some tell us it s from spiders. The algae will worsen and become more noticeable each year trapping moisture and causing premature shingle aging and granule loss.

Micro black spots on siding tags. See debris staining and see proximate cause of roof shingle stains. When that happens it is generally caused by mildew algae mold or dirt stains. But now this black algae is termed a roof shingle algae because of the annoying discoloration on a asphalt shingle roof.

In wooded or shaded areas mold is going to present itself insidiously. Instead use a wood. Remove black stains from roof shingles to preserve the appearance of your home s roof. Black mold we have all seen wood sided homes that turned that death black color.

The algae feed on the limestone in shingles. Black stains on vinyl or painted building exterior wall siding may also be mold as our photo shows at above right. 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. These stains don t respond to oxygen bleach.

The black streaks running down roofs are actually a hardy algae called gloeocapsa magma. The problem is that for many years the only semi transparent wood stains on the market were oil based. The black roof stains are caused by a form of algae that has been around for years typically found in the woods on the north side of trees or on exposed rocks. Others have said it s a.

These black streaks are unsightly and can diminish the appearance of the entire exterior of the home.