Most roofs on historic buildings are made of high quality slate. With proper installation, slate roofing lasts anywhere from 60 to 125 years. Quite a few historic buildings are finally looking at replacement roofing. Too often, these beautiful slate roofs are being replaced or repaired with other roofing materials which affects the historic integrity and appearance of the structure. Efforts should be made to develop a maintenance and repair program to replace worn roofing with new slate. Investment in the proper roofing material will ensure historical accuracy and appearance, and create a beautiful, lasting, and secure roof for the next hundred years.
Read full article here: The Repair, Replacement & Maintenance of Historic Slate Roofs