After a detailed research walsh exposed natural slate including cupa 3 to different weather conditions.
Slate roofing faqs.
Harder slates can conceivably last centuries on a properly maintained roof.
The region where it was quarried determines the life expectancy of roofing slate.
Softer s2 or s3 slates may last about 55 years to 100 years.
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Natural slate is the most durable roofing material.
One of the drawbacks of slate for some homeowners is the heavy weight of slate roofing tiles which can be between 800 1 500 pounds per square 100 square feet.
A quote from the national slate association states for regular slate with a weight of 700 750 lbs.
Over the lifetime of a slate roof a certain amount of weathering will occur which is deemed by many to enhance the beauty of the slate.
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Here are a few more facts about slate.
Walsh highlights that natural slates have a service life of greater than 100 years.
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Consequently not all homes have the structural support necessary to take the weight of a slate roof and often additional reinforcement needs to be installed.
As a result geologist emphasizes natural slate durability to last over a century.