My roof is green. What is that? And can you fix it?”

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My roof is green. What is that? And can you fix it?”

Your green roof is mostly likely caused by a mixture of moss, algae and mildew, and can easily be treated. Washing your roof carefully with bleach and water can usually sweep away most of the moss, but most likely, you will need to trim back some vegetation from your roof to keep it from coming back. In some circumstances where no sun is available, or the weather is perpetually damp, metal strips have been shown to curb the growth of these pests. An extreme measure would be to go with a full metal roof if the periodic roof washings become too much of a chore.

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