Keep a Slate Roof Alive for Centuries
by Joseph Jenkins

Traditional slate roofs are fabulously successful roofing systems that can easily function as a waterproof covering on a building for a century, and, if properly constructed, for 150 years, or even 200 years. Some slate roofs in Europe are still in good functioning condition after 400 years.

Their longevity, however, is not their only quality. Slate roofs are made of natural materials — primarily stone (slate) with wood boards or battens and metal fasteners (nails). They are simple, low-tech roofing systems that are beautiful to look at. When they do need to be replaced, the slates can be discarded as clean fill as opposed to the toxic waste of petrochemical roofs. As such, slate roofs are sought after by those who are ecologically minded.

Despite their reputation as the finest of roofs, slate roofs are arguably the least expensive roof money can buy when the entire life of the roof is taken into consideration. I recently looked at a beautiful slate roof on a cathedral in Arkansas that is 120 years old. The cost to install this ornate 11,700 square foot roof, with a 220 foot spire, was $765.00 for the labor and $1,166.50 for the materials in 1881. Even adjusted for inflation, it should be obvious that this was money well spent.