Flagstone shingles are a standard roofing material. Some stone shingles are mounted set up but some only are held by gravity Hence the roof pitch can't be also steep or maybe the stones will slide off the roof. Sandstone has also been used to make shingles. Gallery of stone http://donovanklkig.full-design.com/The-Basic-Principles-Of-Residential-roofing-company-29466243