qualified, too. Putting fire sprinkler systems on each floor has a profoundly positive effect on the fire safety of buildings with curtain walls. The extended use of new materials like polymers, resulted in an increase of high-rise building façade fires over the past few years, since they are more flammable than traditional materials. Some building codes also limit the percentage of window area in exterior walls. When the exterior wall is not rated, the perimeter slab edge becomes a junction where rated slabs are abutting an unrated wall. For rated walls, one may also choose rated windows and fire doors, to maintain that wall's rating. Film sets and theme parks On a film set and within most themed attractions, many of the buildings are only façade, which are far cheaper than actual buildings, and not subject to building codes (within film sets). In film sets, they are simply held up with supports from behind, and sometimes have boxes for actors to step in and out of from the front if necessary for a scene. Within theme parks, they are usually decoration for the interior ride or attraction, which is based on a simple building design. Examples See also Curtain wall (architecture) Double-skin facade Façadism Potemkin village References Citations Sources Façades: Principles of Construction. By Ulrich Knaack, Tillmann Klein, Marcel Bilow and Thomas Auer. Boston/Basel/Berlin: Birkhaüser-Verlag, 2007. (German) (English) Giving buildings an illusion of grandeur Facades of Casas Chorizo in Buenos Aires, Argentina Further reading The article outlines the development of the facade in ecclesiastical architecture from the early Christian period to the Renaissance. Architectural elements Building engineering