It's natural to be worried about the condition of a roof if it looks like the photo above. You might reasonably think that the shingles are damaged or defective in some way. But there's good news -- it's likely just algae!
This roof algae, which appears relatively frequently in/around Harrisonburg and Rockingham County grows and thrives by consuming the materials that roof shingles are made of --- for example, calcium carbonate. The algae does not seem to cause the shingles any harm, but it makes for an unattractive roof --- that makes home buyers wonder whether something is wrong with the roof.
How can you get rid of these stains, you might ask?
- Per eHow, some simple cleaning with bleach will do the trick.
- Or you could install zinc strips at the top of the roof to stop new growth.
- Or you could (at some point) replace your shingles with algae block shingles that include copper granules. The copper prevents the algae from growing.
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