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Sanjay Gangal
Sanjay Gangal
Sanjay Gangal is the President of IBSystems, the parent company of, MCADCafe, EDACafe.Com, GISCafe.Com, and ShareCG.Com.

Dihedral House in Boulder, CO by Arch11

December 25th, 2012 by Sanjay Gangal

Article source: Arch11

Design strategy:

This modern house designed by Arch11 is a place where the domestic life of a young family weaves with the values of two professional athletes and the outdoors. Where this distinction may separate those roles, lines in this structure seeks to bind and integrate. Anchored on a downtown corner site, this Boulder, Colo. home has an all glass living room and Site-cast, board-formed concrete walls. The latter both moors the building to its site and provides thermal mass to control temperature swings.

The house is organized around crossing dihedral lines–one phenomenal and one tectonic—that shear the interior volumes.

Image Courtesy Raul Garcia

  • Architects: Arch11
  • Project: Dihedral House
  • Location: Boulder, CO, USA
  • Photographers name: Raul Garcia
  • Main construction materials: Glass, board-formed concrete, cedar siding

Image Courtesy Raul Garcia

Sustainable features of the design:

  1. Orientation on the east west axis allows solar exposure to the south. We took advantage of the passive gain by opening the south and limiting fenestration on the north sides. The house performs 30% better than the IEC (international energy code) standard.
  2. ” polished floors provide thermal mass to limit temperature swings.
  3.  All concrete in the foundation and walls are 20% fly ash content.
  4.  Heating is 94% efficient condensing boiler with radiant heat
  5.  HRV for air quality control.
  6.  Recycled content structural steel
  7.  Soy-based foam insulation
  8.  All finish lumber is FCS certified
  9.  All interior finishes are no VOC
  10.  Aluminum windows and doors meet NFRC and AAMA ratings and are manufactured using recycled aluminum.
  11.  80% of the lighting is LED source
  12.  White TPO roof reflects heat and lessens the cooling load and does not contribute to the urban heat sink.
  13.  Glazing is high performance
  14.  Turf is low water fescue
  15.  All appliances are energy star rated
  16. High SEER ac condenser

Image Courtesy Raul Garcia

Other information

This was the first house that Arch11 designed under Boulder’s new compatibility guidelines, which really restrict how much square footage you can have on the lot and how you express that square footage. In order to fit the homeowner’s program on the site, the architects incorporated a large basement that stretches under the house but also has abundant natural daylight.

Total square footage is 5,000 sq. ft. -only 2,900 sq. ft. above ground.

Image Courtesy Raul Garcia

Practice name: Arch11

Founded in 1993, Arch11 has gained recognition for projects ranging from exceptional residences to institutional planning, mixed-use development and product design.

With offices in Boulder and Denver, Colo., Arch11 has 30 combined years of green building technology leadership. The staff’s unusual level of hands-on experience ranges from boat building to furniture making, contributing to its reputation for commitment to craft, detailing and design integrity. For additional information visit

Image Courtesy Raul Garcia

Clients brief:

“They wanted a home as modern as their racing bikes,” says Arch11 principal EJ Meade of the 30-something clients that came to him in mid-2010. “That’s exactly what John and Beth told me at our first meeting. And then they had all of these other bike-related needs like a specific room to store them in, a ramp they could ride right down into the basement directly from the outside, a room to store all their PowerBars and gear in…. It was one of the most interesting programs I’ve even been given.”

Image Courtesy Raul Garcia

Image Courtesy Raul Garcia

Image Courtesy Raul Garcia

Image Courtesy Raul Garcia

Image Courtesy Raul Garcia

Contact Arch11

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Category: House

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