Black Streaks On House Siding

By the growth pattern we think this is almost certainly a dark colored algae.

Black streaks on house siding.

See debris staining and see proximate cause of roof shingle stains. A microscopy lab examination of a sample from this surface would be needed to know for sure. Black stains on vinyl or painted building exterior wall siding may also be mold as our photo shows at above right. Black mold can create dark spots on the surface of siding but often mold growth is not limited to surface areas.

Blacks streaks on roof we will start with black streaks on roof. This algae growth usually begins as small spots and then eventually becomes visible streaks. If you notice lots of tiny black or dark brown spots developing on your siding above a landscaped area of your yard as seen below it is most likely artillery otherwise known as shotgun fungus. 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.

At first you won t see anything for a few years from the time your home or roof is new. They are layers of micro organisms. Contractors drop in the dirt laying on the ground it gets filthy on the backside. You ve never really taken a good look before but yes it s there.

Stains and streaks can show up easily on roofing and siding over time thanks to a whole host of nuisances including mold mildew and plain ol dirt. If black mold is suspected it should be inspected by a mold inspector who is certified. Danny one explanation for this is that a lot of times siding is pretty dirty when it gets on the house. The black stains on the vinyl siding shown at left may be a fungus or a black agae.

The most common type is known as gloeocapsa magma also known as blue green algae. You re outside taking care of some yard work and you suddenly notice streaking on your roof and siding. Use these simple landscaping tips to prevent this from happening. Artillery fungus is a wood dwelling fungus commonly found in mulch.

But testing is probably not justified. Shotgun fungus can shoot black spots on your house here s how to avoid the mess if you re seeing dark specks on your siding the culprit could be hiding in your mulch.