Many slate tile manufacturers offer up to 100 year warranty on their products.
Slate roof lifetime.
These life expectancies are general experience with the material and do not consider installation or environmental factors which vary from one building to the next.
Slate tile manufacturers offer warranties ranging anywhere from 50 years to a lifetime and should a slate tile ever break it can easily be replaced.
Typical life for pennsylvania slate roofs is 40 50 years.
While man made slates are typically cheaper and easier to install they only tend to last for around 20 years.
The biggest downside to slate tile roofs.
Durability and low maintenance.
Life expectancy of ribbon slates.
For fibre cement roof slates the life expectancy is a little shorter at around 50 60 years.