Glass Curtain Wall System, also known as glass facade or glass envelope, is a non-structural outer covering to block the weather impacts on residential or commercial installations as well as allowing natural light to pass through. Biggest benefit of having glass curtain wall system is that it can be made from lightweight glass material and reduce the overall construction costs. However, another major benefit of having glass as curtain wall is to allow natural light to penetrate deep within a commercial or residential building and save on artificial energy. In Most cases, curtain wall systems incorporate a lightweight aluminium frame onto which glass panels can be fixed. Curtain wall systems were introduced in 19th century but became more popular in 20th century as part of the modernist movement.