A quote from the national slate association states for regular slate with a weight of 700 750 lbs.
Slate roofing faqs.
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.
Here are a few more facts about slate.
Harder slates can conceivably last centuries on a properly maintained roof.
Softer s2 or s3 slates may last about 55 years to 100 years.
A tiny amount of colour lightening will occur with ceramic tiles but will be imperceptible to the naked eye.
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.
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The region where it was quarried determines the life expectancy of roofing slate.
Natural cleavage allows slate to be split in one direction with the length running in the direction of the grain.
After a detailed research walsh exposed natural slate including cupa 3 to different weather conditions.
Natural slate is the most durable roofing material.
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Any roofing construction that conforms to good engineering practice and is suitable for other roofing material is adequate.