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Why Do Roofs Turn Black?

A fairly common sight for homeowners, especially in warmer climates, is a roof turning black. This can be seen as a completely black roof or a roof with black streaks. But what exactly causes a roof to turn black?

Roofs usually turn black in the presence of rain and warm weather. It is typically seen in shaded areas of the roof. This can also occur during periods of hot, humid weather because the roof is unable to dry off well.

Blackening of a roof is ultimately caused by the growth of algae on the roof. It is a type of blue-green algae that thrives in warm, wet areas. If you happen to spot this algae on your roof, it doesn’t necessarily mean you need to get a new roof.

Algae growing on your roof is removable. You can get rid of the black streaks with a mix of 50% water and 50% bleach. First, you need to wet the plants on the ground that are below the area you are spraying to protect them from any bleach that falls from the roof. Spray the black areas and then rinse the roof down with water when you are done. Additionally, bleach and water is not the optimal option available. It really is best to call a professional to remove the algae stains.

If you have any further questions regarding your roof turning black, contact our office at (918) 558-ROOF (7663).