Roof algae generally have a black green hue.
Green dots on roofing paper.
Roofing felt prevents the deck from being exposed to the elements before or while the shingles are being applied.
Roofing felt also known as tar paper serves as both an extra layer of protection between the shingles and the plywood and as a temporary moisture barrier until all the shingles are in place.
How to install roofing tar paper.
Green or other colored mosses are a bit easier to remove than lichens on roofing surfaces but both can carry away mineral granules and damage the roof surface.
A 2006 study from the university of michigan compared the expected costs of conventional roofs with the cost of a 21 000 square foot green roof and found that over its lifetime the green roof.
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Algae on a roof surface appears as a thin green coating which is mostly a cosmetic concern.
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It causes the black stains you may see on your roof.
So in our opinion moss is more likely to damage a roof surface than lichens or algae.
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It improves look and uniformity because your roof deck might not lie perfectly straight or flat a layer of roof paper gives an even uniform surface upon which you can install your shingles.
To keep the algae from coming back insert 6 inch wide strips of zinc or copper under the row of shingling closest to the roof peak leaving an inch or two of the lower edge exposed to the weather.
Whether you re building a new house or putting a new roof on your existing house installing tar paper first helps waterproof the roof and prevent leaks.
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Quick run down of the system.
Algae grow most often on wood and asphalt shingles or concrete tiles especially if they do not get a lot of sunlight.
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