Printed from: https://www.conservationhandbooks.com/dry-stone-walling/rebuilding-a-free-standing-wall/the-use-and-abuse-of-concrete-and-mortar/
In a masonry wall, concrete or mortar is usually essential to bind the stonework together. In contrast, a dry stone wall is designed to settle into a durable structure without any cement. The fact that many miles of completely unmortared wall have stood intact for centuries, often with no maintenance or repair, proves that with...