Roofing Stains

Old 09-24-06, 11:22 AM
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Question Roofing Stains

We need a new asphalt shingle roof. We have noticed many roofs in our area are streaked with almost a charcoal color. We assume it is from trees, shade, or some combination.

What causes the staining and streaking? Can it be avoided by usining a specially treated shingle? If it occurs, can it be removed?

This will be an architectural tabbed roof with a color of a light red brick or rusty tan color.

This will be an expensive project due to the complexity of the installation, so paying more for shingles is not an issue.


Old 10-23-06, 06:04 PM
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These stains can be caused by a number of reasons . you usually see them under chimneys, pipes ect.

There is no special asphalt shingle that you can buy to prevent this.. Though you could go with other types of roofing made with different materials.

My suggestion would be to go with a darker shingle color to help mask the stains if this should happen.
Old 10-25-06, 08:15 AM
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Is it prevalent on the north/shaded side? Most likely its mildew and mold. Be careful about some of the DIY'ers tips to get up there and power wash with various solutions. It can be removed but there are potential consequences. I've heard of installing a zinc strip along the ridgeline. For some reason mildew/mold will not propogate in the presence of zinc. As rainwater washes over the zinc, it naturally breaks it down and distributes the elements across the slope. It will not eliminate an existing stains, just prevent future growth.

Supposedly, shingle manusfacturers are going to incorporate zinc into their products.

Good Luck,

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