Should you be concerned about moss growing on an asphalt roofing shingle?


Quick Answer

Moss growing on an asphalt roofing shingle is cause for concern because it can cause shingle wear and premature roof deterioration. A moss covering traps moisture, which causes increased frost damage, cracking and wear.

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Full Answer

Moss can also cause damage to a roof where there is no freezing weather. Over time, moss roots can penetrate and separate roof shingle materials, speeding their decay. Moss can be prevented from growing on asphalt shingles by purchasing chemically-treated shingles and by keeping tree branches trimmed to increase sunlight to the area. Asphalt shingle cleaning and moss removal should be done with extreme caution so the shingles are not further damaged by harsh chemicals and aggressive scrubbing.

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