Under real-world conditions, standard CertainTeed Landmark shingles typically last between 25 to 30 years, while upgraded versions like the Landmark PRO or ClimateFlex can achieve an extended lifespan approaching 30 to 35 years. Although the manufacturer provides a "lifetime limited warranty" covering factory defects for as long as you own your home, actual longevity is heavily influenced by local climate severity, severe weather events, proper attic ventilation, and routine maintenance.
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