Precast Stone is a man made product that has been used as building material since the early 20th century. Precast Stone tends to erode over time much in the same way concrete does. Once a crack develops, water can infiltrate the interior and cause the stone to explode internally during the freeze/thaw cycle. Open mortar joints can also allow water in, thus bringing the salts to the surface and resulting in a compromised stone. Using the Jahn Restoration Mortar system www.jahnmortars.com, Artisans’ craftsmen cut out the affected areas to a stable depth. Then after building up with the appropriate mortar, the stone is reshaped to its original profile. These procedures can also be used to make repairs to structural concrete buildings as well.