Black Marks On Painted Wood Siding Shingles

Black mold we have all seen wood sided homes that turned that death black color.

Black marks on painted wood siding shingles. As the blue green algae accumulate they develop a dark hardened outer coating which results in the black stains you see. The algae feed on the limestone in shingles. Some tell us it s from spiders. See debris staining and see proximate cause of roof shingle stains.

Others have said it s a. The black streaks running down roofs are actually a hardy algae called gloeocapsa magma. Black stains on vinyl or painted building exterior wall siding may also be mold as our photo shows at above right. In wooded or shaded areas mold is going to present itself insidiously.

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. Lawn garden we have thousands of tiny black spots pin head size all over the siding of our house. The algae will worsen and become more noticeable each year trapping moisture and causing premature shingle aging and granule loss.

These stains don t respond to oxygen bleach. The iron found in galvanized fasteners as well as some window screens and flashings can cause blue or black stains on cedar. The problem is that for many years the only semi transparent wood stains on the market were oil based. Oil based stains actually feed mold.

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. It just looks bad. When that happens it is generally caused by mildew algae mold or dirt stains. Micro black spots on siding tags.

But now this black algae is termed a roof shingle algae because of the annoying discoloration on a asphalt shingle roof.