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Innovative Passive House: Uber Haus

Posted by Green Builder Staff

Aug 26, 2014 11:19:09 AM

DUBBED "PASSIVE HOUSE IN THE WOODS", this project takes energy efficiency far beyond the experience of most residential builders. It’s a bleeding edge design, a strikingly modern structure that produces 65% more electricity than it needs. It also has an interesting back story.

“The client’s wife was ill with cancer as we were planning this home,” notes architect Tim Delhey Eian.
“She passed away before construction began, and we ended up changing the design to a much more vertical plan.

“We chose ICFs deliberately, as a pretty fail-safe construction method,” he adds. “I had a good grasp of Passivhaus concepts, because I grew up in Germany and completed the training there.”

Deep Science
Although the systems in this home are familiar, this project takes them to a higher level. The ICFs, for example, extend below grade, and are augmented with a commercial-grade EIFS system that includes 11” of EPS foam above grade—making a wall 22” thick with an R-value of 70.

“We tried to get the North American branch (of Sto Corp.) to provide the details we wanted, but the deal fell through,” the architect notes. “They only offered this version of EIFS in Europe. It puts all of the water management on the exterior. They’ve now started offering it in the U.S.”

The flat roof includes 14” of polyisocyanurate foam, achieving R-95, and the windows and doors, imported from Germany, are triple-pane, low-E coated, with insulated frames. They have an installed R-value of 8. By comparison, a typical wood or vinyl-framed, dual-pane, low-E window achieves only about R-2.

The slab also sits on 12” of EPS foam (R-60), and the garage doors are insulated as well, so the overall heating demand for the home is extremely low. In fact, it has no furnace and no fireplace, despite the cold climate. The home, designed for a heating load of just 3,000 W, relies on passive solar plus a modest ground loop geothermal system, with a back up of electrical floor mats from Nuheat. A super-efficient HRV provides ventilation to the whole house, with minimal loss of BTU.

Along with the 4.5 kW PV panels, the house has a 40-sq.-ft. hot water solar collector that provides 90% of the home’s hot water demand. A small electric hot water heater provides the rest.

Ongoing Improvements
The architect notes that by monitoring the home’s performance during the first year, the team was able to identify hidden energy wasters. “For instance,” he says, “we now know that the well pump was using a lot of energy—12% of the home’s consumption for a year. That was easy to improve.

“At the same time,” he adds, “some of the appliances out-performed our original estimates, in part because they weren’t used as much as expected. But we’re now extrapolating from the lifestyle impacts.”

Too often, notes the architect, home owners look at the aspects of a home that are not important—things that “are really going to go down the drain.” Not so, with this house, he says. It’s a project that ultimately gives the owner freedom—so “he won’t owe monthly bills to anyone.”


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Topics: ICFs, solar, solar hot water, 2011 Green Home of the Year Awards, passive house

On the Edge

Posted by Green Builder Staff

Aug 22, 2014 4:56:41 PM

UNDER NORMAL CIRCUMSTANCES, it would be hard to imagine a home on this site, high atop a cliff, surrounded by breathtaking views. But neither this home, known as the Zero Energy Idea House, nor its
architect, are of the average variety.

“It’s self-evident that this design is saying ‘I’m a different kind of house,’” says architect David Clinkston. “That was the intention—that you see the green roofs, PV panels, solar hot water panels and vertical axis windmill. These are all visible from the road. A ‘green wall’ at the main entrance (to reduce afternoon solar gain) is another clue that all is not ‘normal’ with this house.” The wall is a galvanized steel grid that will provide privacy when vines grow over it.

Not every aspect of the home’s infrastructure is obvious, of course. The structural  insulated panel (SIP) structure sits atop concrete grade beams that thrust back into the steep slope, and the below-grade wall at the back of the house was poured into ICFs.

The house is heated with a Warmboard radiant floor system—wood panels coated with reflective aluminum.

“That aluminum skin is thick,” Clinkston says. “with grooves that direct the heat exactly where you want it.”

Advanced Engineering
The architect took the owner’s interest in “seeing the bones” of the home seriously, specifying a steel frame as the carriage for the SIPs.

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Topics: SIPs, solar, green roof, rainwater harvesting, alternative energy, 2011 Green Home of the Year Awards

Gathering Place

Posted by Green Builder Staff

Aug 20, 2014 11:20:00 AM

OUR JUDGES DID NOT select this home lightly during the 2011 Green Home of the Year contest. There was serious debate about whether its grandiose scale should count against its “green” building science. In the end, however, the ecological zeal of its execution won them over.
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Topics: solar, Insulation, AquaPEX, FSC Certified Lumber, rainwater harvesting, salvaged materials, 2011 Green Home of the Year Awards

Smart Style

Posted by Green Builder Staff

Aug 19, 2014 5:05:52 PM

SOLARIA IS THE FIRST “pre-designed” affordable green house in the Puerto Rico housing market. At $130,000, it’s making waves as a cost-effective way to provide high design to the masses.
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Topics: solar, Energy Star, rainwater harvesting, 2011 Green Home of the Year Awards

Historic Lookalike Home in Florida Costs Only $150 a Month to Cool

Posted by Green Builder Staff

Jul 7, 2014 11:34:00 AM

THIS HOUSE IN SARASOTA, FLORIDA, WASN'T supposed to be green. In fact, the owner, who requested an energy-efficient house, cautioned: “I don’t want a green house. They look ugly, like a garage. I want a home that is a traditional design.” After some back and forth, the owner told custom home builder Josh Wynne that he could make it as green as he wanted as long as he didn’t have to make any financial or aesthetic sacrifices.
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Topics: LEED, solar, energy efficiency, salvaged materials


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