What Causes White Spots On Vinyl Siding

Black spots on siding.

What causes white spots on vinyl siding.

Dirt from rain splash up algae lichens mold moss or even smoke or chemical stains have different causes and different preventative measures. We have these small black spots that look like specks of tar all over our white vinyl siding of our house. The spores dotting your house may not fit in with your redecorating plans but they won t cause any structural damage or grow there. The black tar like spots that are all over your vinyl siding are more than likely a fungus called sphaerobolus stellatus better known as artillery or shotgun fungus although it s most often found on the east coast it can grow anywhere and especially thrives in areas that have cool damp springs or rainy fall weather conditions.

They just won t let go. A major cause of vinyl discoloration is the oxidation of the chemicals in the vinyl over time due to exposure to sunlight and acid rain. This article discusses common causes of stains or discoloration found on vinyl building siding. Over time and through repeated changes in weather vinyl siding will attract and develop mold or mildew spots especially in north facing and other shaded areas.

Vinyl siding stain diagnosis. Distinguishing the type of stain found on siding is useful in deciding on the cause and thus the cure or prevention of staining. I am trying to find them now lo. The vinyl siding institute yes there really is such an organization offers some helpful and specific tips for dealing with stubborn moldy spots on your siding.

It s on the porch my windows but it is worse on the siding. If you have new vinyl siding that s still shiny and you know that the spores haven t been stuck on for more than a few days you might be able to power wash them off.