This question about 30-year shingles (and the same for 50-year and lifetime shingles) is a commonly misconstrued concept to most homeowners. In short, most 30-year shingles do not last 30 years in perfect condition. Manufacturers base the life expectancy of a 30-year shingle on a shingle placed in ideal conditions, such as without strong winds and in minimal sun exposure. Also, warranties for 30-year shingles don’t typically last for 30 years, either. You can always ask our experts at ASI Construction for more information on specific shingle brands, material types, and warranties.