What is the function of a building envelope?

The building envelope serves a critical role in architecture by acting as the barrier that separates the interior environment of a building from the exterior environment. This separation is vital for maintaining indoor comfort, regulating temperature, humidity, and air quality, and ensuring energy efficiency. The envelope includes various components such as walls, roofs, windows, and doors, all of which contribute to the protection of the interior from outside elements such as weather conditions, noise, and pollutants. By effectively creating this boundary, the building envelope helps to create a safe, habitable space for occupants while supporting the overall performance of the building.