Many slate tile manufacturers offer up to 100 year warranty on their products.
Ribons on slate roofs.
Ribbon slate roofs once they start to fall apart are hopeless.
Ribbon slate is roofing slate with linear colors running in stripes through the slate material.
Slate and tile are so durable that they often outlast the underlayment and fasteners.
Ribbons of color in ribbon slates on roofs may be in the entire shingle or in some applications may be in the upper or covered portion of the slates.
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.
Ribbons typically weather more and were most common in pennsylvania slate quarries.
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A ribbon slate roof is not necessarily a bad thing as the quality of some ribbon slates is better than others.
A above the nail holes b between the nail holes and c beneath the nail holes fig.
In the photo at left a mix of ribbon slates have diagonal colored stripes of mineral inclusion but they do not show the characteristic delamination and wear we see on classic ribbon slates.
The ribbon may appear in one of three places.
For people who do not plan to ever sell their home the incredible longevity of slate is a highly desirable benefit.
This led to the roofing contractor sorting the slate on site and installing the longest and widest slates at the.
Often the ribbons are diagonal depending on how the slate was quarried.
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.
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.
A good penn black slate roof may have a life expectancy of eighty years given the right roof pitch and weather exposure but the ribbons are more likely to disintegrate well in advance.
Building paper or self adhering bituminous membrane copper attachers and copper flashing.
Generally the steeper the roof the better with regard to service life of slate.
So when repairing or replacing these roofs prolong the life of the installation by using heavy underlayment 30 lb.
At a certain point in the life of a ribbon slate roof the slates may start to break at a faster than normal rate.
A slate roof will easily last over 100 years which is at least double of what other roofing materials can offer.
References about slate roof durability at least among home inspectors and some slate books claim that ribbon slates were inferior and likely to have a shorter life due to their mineral inclusions.
