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To combat this problem most manufacturers now make stain resistant shingles. These products are expected to look good for up to 10 years. You should read the fine print carefully before installing them. *In some cases, these new resistant shingles can damage your gutters, down spouts, valley flashings, etc. Here's why: They contain large amounts of copper. Copper leaches from the shingles, collects in gutters, and corrosion results.
This phenomenon is called electrolysis. Fact: 98% of American homes have gutters made from zinc, aluminum or tin. These metals are incompatible with copper. Unfortunately, corrosion damage is not covered in the shingle warranty. Ask the manufacturer for more information. *(source: the manufactures warranty).
The recent housing boom will add a blizzard of complaints for shingle makers, and unfairly the people who install shingles for a living. Fortunately, the cure for roof staining is affordable, and if caught in time it’s very easy to treat. We wouldn’t dream of replacing vinyl siding, decks, carpet, concrete or fencing just because it got dirty. We clean these surfaces regularly. Now, any roof can be safely cleaned and protected by Affordable Roof Cleaning
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