If you have visible, non weather-related damage to your roof, you most likely have defective shingles. There are currently thousands of roofs with CertainTeed shingles that are deteriorating at a much quicker pace than the industry standard. This is due to a manufacturer defect. This defect was so widespread that many lawsuits were filed against CertainTeed over the past few years, lawsuits which eventually became one large class-action lawsuit. In February of 2010, CertainTeed entered into an agreement to settle the class-action alleging that their organic asphalt shingles manufactured from July 1, 1987 through 2005 are subject to premature failure. Please be aware that this defective roof shingle issue also looks like the manufacture ATLAS Chalet Shingles and it’s Class Action Law Suite. Here is a link to that Blog ATLAS Defective Shingles.