Drywalls contain no mortar to keep them intact. Instead they depend on the weight and friction of one stone placed upon another for cohesion and stability.
There is no footing required since the stones are not bonded together and will rise and fall with the frost.
Adam Ross Cut Stone Company, Inc. has one of the largest, most complete stone operations in upstate New York. That's why builders, masons, architects, and knowledgeable homeowners choose Adam Ross for a quality product.