A façade is the front of a building. 

A façade is the front of a building. 

A façade is the front part of a building. 

A façade is the front part or exterior of a building. 

Many buildings use façades to change their look. In the Georgian period, people gave old houses fashionable new fronts. 
Modern high-rise buildings use different ways to build their exteriors. These walls are often suspended from concrete floor slabs. 
Fire safety is a huge job for engineers. 
Not all façades are part of real, permanent buildings. Film sets and theme parks use them for decoration. 
A façade is the exterior face or front part of a building. 
Architects often use façades to update the appearance of older structures. During the Georgian period, many English townhouses received fashionable new fronts. 
Modern high-rise construction utilizes specialized façade systems. In these tall buildings, exterior walls are often suspended from concrete floor slabs. 
Fire safety is a critical consideration in façade engineering. Some façades require a specific fire-resistance rating. This is necessary if two buildings are positioned very close together. A rated façade helps lower the likelihood of fire spreading between structures. Engineers must consider the melting point of materials during a fire. For instance, aluminum typically reaches its melting point within minutes of a fire starting. Building codes may also limit the percentage of window area allowed in exterior walls. If a wall is not rated, the junction where it meets a rated slab becomes a point of concern. To maintain safety, builders may choose rated windows and fire doors.
New materials have changed how fire behaves in high-rise buildings. The extended use of polymers has led to changes in safety data. These polymers are more flammable than traditional building materials. This has resulted in an increase of high-rise building façade fires in recent years. To help manage these risks, engineers use fire stops for building joints. Additionally, installing fire sprinkler systems on each floor has a profoundly positive effect. These systems help protect buildings that utilize curtain walls from spreading flames.
Not all façades are intended to be permanent or functional buildings. Film sets and theme parks use façades for different purposes. 
Understanding the façade requires looking at both art and science. It connects the history of local architecture to modern engineering. Many historical façades are protected by local zoning regulations. These laws can restrict or even forbid any alterations to the exterior. This ensures that the history of a city remains visible. Whether it is a massive cathedral or a movie set, the façade defines how we perceive a space. It acts as the interface between the internal world of a building and the external world of the observer.
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