as a result of poor ventilation within the roof space. An important aspect of slate roofs is the use of metal flashing, which will last as long as the slates. Slate shingles may be cut in a variety of decorative patterns and are available in several colors.

Flagstone shingles are a traditional roofing material. Some stone shingles are fastened in place, but some simply are held by gravity, so the roof pitch cannot be too steep, or the stones will slide off the roof. Sandstone has