[CSDA] residential.

• Position: Colorado Sustainable Design Awards

1st PLACE

Edge House, Boulder

Architect: Rodwin Architecture

SUSTAINABLE FEATURES

* The project introduced Boulder's first legal gray water system, which required lobbying to change the building code, and a ground source heat pump. The design utilized an innovative sleeved technique to allow the hole to be drilled through 100 feet of gravel.

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* The previously piped storm water system was opened up to restore it to its historic configuration as a natural, "seasonal wetland."

* Energy strategies include passive solar design (window size, placement and tuning, paired with large calculated overhangs), natural daylighting (light from two sides of all major rooms, and a giant Kalwall skylight at the core), natural cooling (operable windows on two sides of all major rooms), and thermal mass at the core (three-story stone wall).

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OVERVIEW

Located in a dense 5o-year-old neighborhood, the property has easy bus access and is near shopping and schools. The existing 43-year-otd, 7,000-square-foot house was built substantially over the property lines, had no possibility for passive solar orientation, and contained six stories and lots of asbestos. The project entailed deconstructing it, resulting in a 91 percent landfill diversion. An innovative "replacement value" accounting method for deconstruction tax deductions made the renovation financially competitive with demolition. The new exterior material palette reflects the predominant use of local materials in the existing neighborhood. By preserving the existing vegetation and augmenting it with native xeric plants, almost 30 percent of the site that had been previously built upon was restored to native habitat. The living and dining rooms bend around a large existing tree, creating a beautiful outdoor room.

JUDGES' COMMENTS

THIS LEED PLATINUM-CERTIFIED, ZERO-ENERGY HOME, FEATURING A CLIMATE-APPROPRIATE PASSIVE DESIGN, CAN HELP TEACH THE WORLD ABOUT THE NET-ZERO CONCEPT AND HOW TO BE TRULY SUSTAINABLE. ITS WATER RECLAMATION SYSTEM--THE FIRST LEGALLY PERMITTED GRAY-WATER SYSTEM IN THE CITY OF BOULDER--CAN HELP PROMOTE HOW COLORADO CAN ATTACK ITS ANTIQUATED WATER USE RESTRICTIONS. IN MANY WAYS, THIS HOME IS A LABORATORY FROM WHICH WE CAN ALL LEARN."

2nd PLACE

Ridge View, Nederland

Architect: Weber Architecture

SUSTAINABLE FEATURES

* 24 Ridge View has received the highest level of sustainable building certification by the National Association of Home Builders...