Ribbons typically weather more and were most common in pennsylvania slate quarries.
Slate roof ribbons.
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Evaluation of these components does not differ from any other roofing system.
These are called ribbons and are caused by carbon calcite iron or quartz that were present in the sediment from which the slate was formed.
Ribbons are visible as bands on the cleavage face of slate and represent geologic periods during which greater amounts of carbonaceous matter calcite or coarse quartz particles were present in the sediment from which the slate was formed.
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Not only will slate shingles last longer on these steeper slopes but they will be more visible from grade and show off their natural beauty.
Vintage roofing slate early 1800 s with musical art.
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Slates with these ribbons have the shortest service life about 75 to 90 years.
Terne coated sheet iron lead coated copper lead sheet galvanized steel and copper are the most common flashing materials used with historic slate roofs.
Slates with diagonal or striped inclusions of varying colors or ribbon slates include products with a very long life expectancy and other ribbon slates that are or were a low priced slate with soft inclusions short life and leaks.
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Anything above a 8 12 is preferred and slopes in the 12 12 to 18 12 range are probably ideal.
Generally the steeper the roof the better with regard to service life of slate.
For slate roofs flashing is often the weak link.
It remains in good condition and was still on the home in 2018.
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A chain is only as strong as its weakest link.
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