Masonry is the art of building a construction by assembling elementary materials, linked or not by a mortar. It is the art of the mason by definition, but also the result of his work. By extension, one also associates under the term "masonry" the work of dressing of the sets (laying of plasters, tiling, etc.), which, in addition to their aesthetic purpose, participate in the holding of the set in the face of external aggression. (humidity, frost, etc.)