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Power Washing, Roof Cleaning -> National Softwash Alliance -> Safe Soft Wash Shingle and Tile Roof Cleaning -> Re-roof a lichen and algae covered roof?
Post Info TOPIC: Re-roof a lichen and algae covered roof?
Dan Dykstra


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Re-roof a lichen and algae covered roof?
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I have begun to notice more than a few homes in and around my area that are having another layer of shingles applied over the top of shingles that are covered in black streaks, moss and lichen. I would think that this is going to cause the new shingles to degrade at a much quicker pace, not sure why any roofing company would even agree to do this.



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Zach Maynard


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I think the majority of these companies know far less about these issues than we do. The bigger issue may be it spreading to the new roof quicker?

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Patrick G


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I think a new roof would kill the G/M. But new roofs today are getting streaks at 5 years young.

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Fred W


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I don't think there would be an issue with GM and probably not even an issue with lichen. Moss on the other hand would cause the shingles to raise a bit. I would also bet the moss would void the new shingle warranty but I'm not sure about that.

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Zach Maynard


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I took some pictures of this scenario over the weekend I will hop on and post them. It showed the lichen dead and seemingly no affect to the new roof.

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