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Virginia Beach Roofing: Article About Are Roof Stains Problematic?

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Many homeowners become dismayed when they notice what appear to be dark colored stains on top of their shingles. These stains can appear suddenly, and may even be present on newer roofs. Are they anything to worry about, or should property owners ignore them? Here are some things anyone who has noticed these stains should know.

Dark stains on asphalt shingles are actually caused by a type of algae known as Gloeocapsa magma. This algae actually thrives on many of the minerals that are used to make modern day shingles. They are especially common on shingles that have a high concentration of limestone, since this is primarily what this algae feeds on.

Gloeocapsa magma can actually grow anywhere, but it is more common in climates that have a great deal of humidity. Virginia Beach roofing contractors often notice it on shaded or north facing roofs that do not receive a great deal of sunlight during the day.

This type of algae is actually harmless to a roof; however, it can cause a rather unsightly appearance. Homeowners who are bothered by its appearance can spray down the affected area with a pump sprayer that contains a mixture of two parts water to one part bleach. Next, scrub the area with a soft brush such as those used in window washing.

A roofing expert from Jayhawk Exteriors of Virginia Beach would be happy to answer any question you have about roofing, siding or gutters.

Never use a pressure washer or stiff bristled brush, as this could actually damage the shingles. Follow this with a rinse of clear water to remove bleach residue.

After removing algae, it's important to take measures to prevent it from reoccurring. The best way to do this is to place copper or zinc strips near the roof's ridge. Copper and zinc both repel algae, so mounting strips on the ridge allows particles to run down the roof's surface, making it difficult for algae to grow. These strips should be installed by a professional, since they must be carefully placed in order to be effective.

When replacing a roof, the type of shingles chosen can affect the likelihood of algae growing. Whenever possible, homeowners should choose shingles that contain copper granules as this type is likely to prevent algae from growing. Choosing shingles with copper granules will also eliminate the need for strips on the roof's ridge.

Black algae stains on a roof are not harmful, but are nonetheless unsightly and affect the home's appearance. Fortunately, eliminating these stains and preventing future ones is something homeowners can do quite easily.

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