A curtain wall is a system of front freestanding, generally light and glazed, independent of the structure resistant building, which is built continuously ahead of her. A curtain wall is designed to withstand the force of the wind, as well as its weight, and transmit it to the forged ones. Generally, curtain walls are constructed by the repetition of a prefabricated modular element that includes the necessary elements of protection, opening, and accessibility according to the needs. The curtain walls are typically designed with extruded aluminum profiles, although the first curtain walls were made of steel. Most of the surface of the wall is usually closed with glass, which gives a pleasant appearance to the building while facilitating natural lighting. However, parameters related to the control of solar gains, such as thermal and visual comfort are more difficult to control when using glazed curtain walls. Other materials used are stone, panels, and metal sheets.