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.
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.
Widely used in buildings ranging from retail/office complexes to hospitals, storefront and window wall systems are specified for ground-level fenestration and entrances, and for punched and horizontal bands (or ribbons) of windows.
In the December 2014 issue of The Construction Specifier, Dean Lewis wrote about the North American Fenestration Standard/Specification for Windows, Doors, and Skylights’s (NAFS’) short-form specification. American Architectural Manufacturers Association/Window and Door Manufacturers Association/Canadian Standards Association (AAMA/WDMA/CSA) 101/I.S. 2/A440, serves as the basis for product certification as required by the International Building Code (IBC).