It is incumbent upon any professional roof consultant who claims an expertise in slate roofing to be familiar with all the types of slate and the characteristics of each, including their expected longevity. Roof slate, stated simply, is stone. It is quarried up and down the eastern seaboard of the United States as well as around the world, yielding many different types, colors, and characteristics. Roofing slate can last roughly 55 years to perhaps 400 years, depending on the type, thickness, method of attachment, slope, and other factors.
Skilled roofing contractors in Hampton Roads say that since historic slate roofs contain unique details and craftsmanship, they should be repaired rather than replaced whenever possible. Many historic buildings roofed during the late 19th and early 20th centuries utilized slate, and due to the 60-125 year lifespan of the average historic slate roof, many of these roofing systems are nearing or have experienced the end of their serviceable life. Instead of improper roofing repairs and replacements, sensitive interventions that preserve the original material as well as the building’s historic character remain the best recourse.
http://www.theroofingcompany.com/virginia-beach-roofing-contractors-restoring-historic-slate-roofing/
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