Seattle architect Brett Holverstott is putting the finishing touches on the design of a passive house to be built on the shores of Lake Chelan this year.
The home will be located on the north shore of the lake and will face south, which Holverstott says helps make its an ideal candidate for passive design. A passive house incorporates super-insulated floors, walls, and roof; air-tight enclosure; high performance windows primarily oriented to the south; and a heat recovery ventilator (HRV) which uses the outgoing air to precondition the incoming air.
The architect’s sketch of the sustainable, passive house to be built on the north shore of Lake Chelan this summer.
“The combination of these devices, effectively used, produces a house that requires no furnace and almost no ductwork, has fantastic indoor air quality, no annoying drafts, and can be heated with a light bulb,” Holverstott states on his website, cambrian-design.com. A passive home can consume 85 percent less heating/cooling energy than a typical home.
Construction is scheduled to start in late May or June. Brothers Mike and Mark Schramm of Green Gables Construction, Chelan, are the builders.
The home will be 1,150 square feet. The basement/foundation will be buried in the earth. The home will feature a large shed roof that lifts toward the lake view. An entry court between the house and garage will serve as a view deck, providing “a moment of pause” before entering the home, Holverstott said.
The exterior walls will be a foot thick and of double-wall construction, with a 2′ x 6′ wall with structural plywood sheathing on the exterior side, and a 2′ x 4′ wall with the drywall on the interior side. “The resulting cavity can hold a lot of insulation,” Holverstott noted.
Some of the decisions about building materials are still being made, but Holverstott said he would like to use Forest Stewardship Council (FSC) certified lumber and plywood. The insulation in the walls will be densely packed cellulose, a byproduct of newsprint, which contributes to air-tightness. The insulation in the roof cavity will be blown-in fiberglass, because of its lighter weight.
The home is the retirement dream of Rick and Jacque Hyler of Renton. Rick just retired from Boeing and Jacque is a part-time tutor. It will be their permanent home, not a second home, Holverstott said.
He said the home will be a demonstration of affordable green design.
“The cost of the design is targeting $200,000 including all ‘soft costs’ such as utility hook-up fees, permit fees and architect fees,” he said. “This is a difficult target to reach in today’s dollars, and we have had to reduce the square footage of the house from 1,500 to 1,150.
“The super-insulation and air-tightness of the house are not significant up-charges, on the order of less than 10 percent. But passive-house grade windows are easily two to three times the cost of traditional windows. We have done a lot of research to find the best deal on these windows, which are provided by local and international manufacturers. High ceilings also add to the construction complexity and cost.”
The owners have opted to save some money by bargain hunting and installing interior finishes themselves. But they’re committed to acquiring top-of-the-line energy efficient appliances to contribute to energy savings. They’ll take advantage of Chelan PUD rebates where possible.
Holverstott established Cambrian Design last year after working on science laboratories, commercial interiors, single and multi-family housing and even a jazz venue. This is his first independent venture.
You can learn more about this project on the Cambrian Design blog.