Black Marks On Painted Wood Siding Shingles

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.

Black marks on painted wood siding shingles.

The black streaks running down roofs are actually a hardy algae called gloeocapsa magma. As the blue green algae accumulate they develop a dark hardened outer coating which results in the black stains you see. 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. Instead use a wood.

Oil based stains actually feed mold. These black streaks are unsightly and can diminish the appearance of the entire exterior of the home. The problem is that for many years the only semi transparent wood stains on the market were oil based. Remove black stains from roof shingles to preserve the appearance of your home s roof.

It is not uncommon for roof shingles to turn black over time. These stains don t respond to oxygen bleach. Black mold we have all seen wood sided homes that turned that death black color. Some tell us it s from spiders.

The iron found in galvanized fasteners as well as some window screens and flashings can cause blue or black stains on cedar. When that happens it is generally caused by mildew algae mold or dirt stains. Others have said it s a. Black stains on vinyl or painted building exterior wall siding may also be mold as our photo shows at above right.

It just looks bad. Lawn garden we have thousands of tiny black spots pin head size all over the siding of our house. 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.

See debris staining and see proximate cause of roof shingle stains.