Stonemasonry employing dressed stones is called ashlar masonry, While masonry applying irregularly formed stones is recognized as rubble masonry. Cracks can come about as a result of settling, thermal enlargement, or improper guidance. Small cracks can typically be fixed with masonry caulk, whilst larger sized cracks could involve Expert awareness. https://www.citygratis.com/usa/7-services/235122-west-hills-masonry.html