Slate is one of the three original, acceptable roofing materials for new homes constructed by the Van Sweringen company. The City urges owners of homes with slate roofs to maintain them and consider carefully before replacing them with any other material.
Longevity of Slate
Slate roofs can last 200 years or longer, depending on the type of slate used, the configuration of the roof and the geographical location of the property, according to a bulletin published by the Technical Preservation Services arm of the National Park Service. By contrast, the average life span of an asphalt roof is about 30 years.
Two additional factors help determine a slate roof's life span: how the roof was installed and how well it has been maintained. In Ohio, well-maintained slate roofs on farmhouses and barns often date to the late 1700's.