The building envelope’s fundamental purpose is to offer protection from the elements, providing comfort and safety to occupants within. However, in the quest for improved performance and innovation, additional roles and requirements have arisen.
By comparing exterior noise levels with interior requirements, and considering background noise levels, a project’s required level of window or curtain wall acoustic performance can be inferred either in specific frequency bands or by using one of the single-number rating systems described in this article.
When specifying glazing solutions for vision, sound, light, and heat control, design actions often come down to a choice between integrated louvers and integrated blinds. Knowing the difference between the two—and which option may be more suitable for an application— is critical.
With glazed façades dominating urban landscapes, the strides made to improve the energy efficiency of glass are well-documented and generally well-understood. However, the framing members of wall and window systems have also been re-engineered.
Fenestration—such as windows, curtain walls, window walls, sloped glazing, storefronts, and doors—affects building energy use through four basic mechanisms: thermal heat transfer, solar heat gain, visible transmittance, and air leakage.
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