20 Years. That is the life expectancy of the average roof system.
The life span of a roof system is determine by a number of factors, like: roof system design, building structure, material quality, material suitability, proper installation, periodic maintenance, local climate, and much more. Material quality is especially important because some roof system types such as clay tile, slate and (certain) metal can last longer.
When choosing the materials for a new roof (or when hiring a professional, make sure to check the warranties on the materials. Most roofing manufacturers offer warranties on their products and you should be wary of any manufacturer that doesn’t.
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