60 to 90 years.
Ribbons on slate roofs.
According to an identification guide on the slate roof central website some of the hardest heartiest types are.
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So the life of a ribbon slate roof depends on the particular ribbon slates installed and thus on the quarry where they originated.
Some ribbon slates include mineral inclusions that weather out and lead to a short slate roof life.
Graduated length slate roofs the practice of installing slates of varying lengths and widths on a roof came from the days when some quarries produced slate on an as available basis rather than in specified lengths and widths.
How long your slate roof will last depends largely on what type of rock was used.
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When replacement is necessary details contributing to the appearance of the roof should be retained.
Of the interior 1922 famed geologist oliver bowles declared that the ribbons were of no consequence to the longevity of the.
But plenty of ribbon slate roofs like the poughkeepsie home shown at left are very durable lasting many decades.
Slate split from a block are holed and trimmed in such a manner that the ribbon occurs on the top end of the slate thus hidden from view once they are installed on a roof.
Slate roof central how to identify roof slate.
This is a generalization as some of these slates fail sooner some last longer.
4 pennsylvania black slate below from the lehigh northampton slate district tends to be the soft slate with a life expectancy of 75 125 years.
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Above the ribbon slate roof in poughkeepsie new york was about eighty years old when we took the photo in the 1980s.
On a different home in the same city the mansard style slate roof shown below right employs a mix of ribbon slates some of which were quite worn and appeared to.
Other factors in roof longevity.
Slate from different mines has different average slate roof life expectancies with proper installation and regular maintenance.
This led to the roofing contractor sorting the slate on site and installing the longest and widest slates at the.
It remains in good condition and was still on the home in 2018.
Slate roofs are a critical design feature of many historic buildings that cannot be duplicated using substitute materials.
175 years or more.
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125 to 175 years.
100 to 200 years.
Slate roofs can and should be maintained and repaired to effectively extend their serviceable lives.
