Black Marks On Painted Wood Siding Shingles

It is not uncommon for roof shingles to turn black over time.

Black marks on painted wood siding shingles.

Others have said it s a. 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. It just looks bad.

Oil based stains actually feed mold. See debris staining and see proximate cause of roof shingle stains. Instead use a wood. Remove black stains from roof shingles to preserve the appearance of your home s roof.

When that happens it is generally caused by mildew algae mold or dirt stains. Black mold we have all seen wood sided homes that turned that death black color. The algae will worsen and become more noticeable each year trapping moisture and causing premature shingle aging and granule loss. The black streaks running down roofs are actually a hardy algae called gloeocapsa magma.

Lawn garden we have thousands of tiny black spots pin head size all over the siding of our house. Black stains on vinyl or painted building exterior wall siding may also be mold as our photo shows at above right. These stains don t respond to oxygen bleach. Micro black spots on siding tags.

The problem is that for many years the only semi transparent wood stains on the market were oil based. These black streaks are unsightly and can diminish the appearance of the entire exterior of the home. 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. The iron found in galvanized fasteners as well as some window screens and flashings can cause blue or black stains on cedar.

In wooded or shaded areas mold is going to present itself insidiously.