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Conference_programme: 17.1 - Façade Insulation and protection against outdoor noise

Lecture: Acoustical Performance of Aluminum Framed Facade Systems

Author(s): Bielefeld Hans-Walter , Deganyar Tejav

With the recent environmental noise pollution concerns and the growth in the construction of residential dwellings in noisy urban areas, prescribed acoustic requirements have become more prevalent in the design of building envelops. Aluminum framed window systems are the leading choice for modern facades construction. These systems provide a high degree of weathering reliability, installation ease, and overall economy while maintaining transparency and environmental efficiency. \nIn typical facades, glass covers the bulk of the exposed surface. Therefore, it is the primary source of sound energy transmission from exterior to interior. Traditionally the acoustical requirements have been dictated through the specification of the sound transmission characteristics of glass. The Recent availability of the double cavity insulated glass products, as well as the development of acoustical laminates, has significantly increased the acoustical performance of the glazing systems. Double-layer glazing strategies have also been employed to create a greater degree of sound isolation, by creating large air pockets in-between the exterior wall and an auxiliary interior glass barrier. \nAluminum and glass have comparable stiffness and density properties, which gives them roughly matching acoustical characteristics. However, with the advent of the new higher performing glass solutions, the framing elements becomes more critical for limiting of the sound transfer. This study investigates the noise transmission characteristics of aluminum and glass facade systems. It concentrates on the contribution of framing system to the acoustical performance of glass. It demonstrates through a series of laboratory tests and parametric analysis the sensitivity of sound transmission loss of the framing elements, size, and configuration. Also, it introduces new mullion designs that mitigate sound using improved detailing and supplementary material. The interaction of these new concepts with other façade characteristics, such as thermal attributes is examined. Enhancement of ancillary components such as spandrels and shadow boxes are also examined to explore their effect on the overall system performance. \n

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Corresponding author

Name: Dr Tejav DeGanyar

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Country: United States