Tag Archives: B2010.40?Fabricated Exterior Wall Assemblies

An Advanced Frame of Mind: The Window-to-wall Ratio Dilemma

Reducing the window-to-wall ratio (WWR) could compromise human views and comfort.

In 2013, the American Society of Heating, Refrigerating, and Air-conditioning Engineers (ASHRAE) proposed an addendum to ASHRAE 189.1, Standard for the Design of High-performance Green Buildings. The proposal seeks to reduce the window-to-wall ratio (WWR) area from 40 to 30 percent in small and medium-sized prescriptive-path buildings (buildings fewer than 23,226 m2 [250,000 sf]). ASHRAE 189.1 would allow building and design professionals using the performance-based approach to increase the glazed area.

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Window and Storefront Thermal Performance: What every specifier needs to know

Photos © Benjamin Benschneider

Energy efficiency is becoming an ever-increasing goal, but it can be difficult with fenestration due to a need to balance performance requirements while remaining economically viable and minimally impacting the environment. Advanced glazing design is evolving to address growing energy management issues, but design professionals must know how to properly employ the right tools to achieve the desired result.

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