Wall caps serve a number of functions when installed on a wall. They help to keep water out of the wall, which minimizes the risk of damage from freezing and thawing over time. The coping also protects the top of the wall from physical impacts or damage. In a wide number of applications, wall coping is chosen for its aesthetic appeal. Different types of coping can give the wall a smooth, polished appearance while helping to conceal mortar or rough stone surfaces from view.