Standard architectural CertainTeed shingles, such as the widely popular Landmark series, typically have a real-world lifespan ranging from 25 to 30 years under normal environmental conditions. Upgraded lines like Landmark PRO or ClimateFlex can achieve an extended lifespan of 30 to 35 years. While the manufacturer offers a lifetime limited warranty covering factory defects, actual longevity depends heavily on proper attic ventilation, climate severity, regional weather events, and routine maintenance.
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