Specifying Shades in a Performance Based Design

Interior fabric solutions reach far beyond aesthetic appeal in a space.

09/01/2016 By Colin Blackford

Designer Mieke Gerritzen said, “Design is where science and art break even.” Modern architecture highlights this notion, setting a new bar for innovation that emphasizes optimizing performance and aesthetics. Owner expectations are high and the impact of these considerations on the occupant is critical. For architects and designers, clearly defining design intent and specifying appropriate, technologically advanced building products early in the process is crucial to the success of the project.

Building design often begins with the fenestration system, which includes the glazing and framing system, doors and entryway, curtain walls, skylights, and more. Yet, another component of the fenestration, window treatments, tends to be an afterthought in the A&D community.

A detailed understanding of innovations in solar shading, as well as how they can be used to enhance overall building performance and occupant comfort, is a valuable tool for any architect or designer. With this information, you can better recognize and convey the solutions’ role in helping achieve the balance between science and art for a building, inside and out.

Performance-based Design is about the occupant

Architects in particular have a unique opportunity to demonstrate their commitment to innovation by selecting products that not only look beautiful, but also contribute to energy efficiency and occupant comfort. Don’t make the mistake of specifying fabrics based purely on room-side appearance without at least giving thought to performance-related factors such as shade color and Openness Factor (OF), or the percentage of holes in a solar shade:

  • Shade fabric color plays a significant role in building performance and occupant comfort. For example, light-colored shade fabrics typically reflect a higher percentage of solar energy and reduce interior heat gain better than dark-colored shade fabrics, creating a more comfortable space. However, light-colored fabrics allow higher visible light transmission (Tv) values, which may add to greater visual discomfort and glare. Dark-colored shade fabrics more effectively manage glare and, consequently, create better views to the exterior.
  • In addition to color, architects and designers can select the density of a shade’s weave to achieve optimal levels of daylighting, privacy, and view through. Openness factors of 1, 3, 5, and 10 percent progressively allow more daylight and enhance views to the exterior, which can be valuable based on client desires or occupant needs. Higher openness factors have been popular in many modern buildings as architects strive to create people-centric designs that provide occupants with a connection to the outdoors. In fact, occupants with views of nature are 6 to 12 percent more productive than occupants without such views1. Still, an emerging design trend is toward tighter OFs in order to enhance privacy and minimize solar heat gain within a space.

In many cases, specifying shading fabrics to enhance occupant comfort can be markedly more important to the bottom line than the energy cost savings they help provide. To illustrate that point, consider that companies spend, on average, up to 100 times more on employee compensation than on their building’s energy consumption, according to a study done by the Rocky Mountain Institute.

Balance the Interior and Exterior Design Intent

One of the most important considerations for an architect or designer is whether certain products help to achieve an intended design result. While some still believe shade fabric appearance only affects aesthetics to the interior, the reality is quite different.

In addition to performance, shade fabric color affects a building’s outward appearance when combined with the aesthetic properties of the glazing. Light-colored shades are often more visible from the street-side and can appear slightly green behind clear glass due to the levels of iron content in the glass. When manually lowered to different levels, light-colored shades can create a “snaggletooth” look that is visually distracting during the day. To protect the integrity of the selected glazing’s reflected color, darker shades can provide an aesthetic continuity to the exterior façade no matter how far they are raised or deployed. Dark shades tend to simulate the darker interior cavity of a building when the more dominate light source is on the exterior.  

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