There is no widespread, systemic product defect or major class-action scandal plaguing modern CertainTeed Landmark shingles. Historically, older generations of CertainTeed organic shingles faced durability scrutiny decades ago, but contemporary fiberglass-based Landmark shingles are exceptionally reliable. The most common "problems" reported today are strictly tied to installation errors—such as incorrect nail placement or lack of proper intake/exhaust ventilation—which can void warranties and trap heat, shortening shingle life.
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