Algae

Published on February 16th, 2016 | by Henri

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Don’t pressure-wash asphalt shingles

Q.  I have two giant trees that flank my house. The front side of my roof gets very little sun. I have tried a Clorox/water mixture to get rid of the little mossy balls that crop up on the asphalt shingles. They can be washed off with a garden hose but that does not kill the moss itself. Would it OK to use a pressure-washer to wash the roof down or would that damage the shingles?

A.  Don’t use a pressure-washer on asphalt shingles; it will dislodge the mineral granules that protect them from the UV-rays of the sun. The solution to get rid of moss and lichen from asphalt shingles is made of three parts white vinegar to one part water. It takes quite a while to see results.

Do keep in mind that moss and lichen do not materially affect the life of asphalt shingles.

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