Tag Archives: Sustainable Village

UAF Sustainable Village Cuts Energy Use in Half

The Birch House at the UAF Sustainable Village used the equivalent of 367 gallons of heating oil in the first year of occupancy, less than half as much as an average home its size in Fairbanks.

The Birch House at the UAF Sustainable Village used the equivalent of 367 gallons of heating oil in the first year of occupancy, less than half as much as an average home its size in Fairbanks.

The Sustainable Village homes at the University of Alaska Fairbanks are a new model of energy efficient, affordable housing for Interior Alaska. The four 1,600-square-foot homes were built at the university in 2012 to demonstrate that super-efficient, climate-appropriate houses could be built without breaking the bank. University students helped design and build the homes, adding their own ideas about sustainable campus living.

The homes incorporate experimental techniques, like solar hydronic heating and adjustable foundations on permafrost, that should reduce energy costs and improve the durability of the homes. CCHRC, along with student residents, have been monitoring the energy use and indoor air quality at the homes for the past year.

On average, the homes used less than half as much energy as an average new house in Fairbanks. The lowest user was the Willow house, going through the equivalent of 366 gallons of heating oil No. 1, or 48.3 million Btu, for both heating and domestic hot water from September 2012 to September 2013. The average same-size house in Fairbanks uses about 920 gallons, according to the Alaska Housing Finance Corporation’s database. Even the average new energy efficient house uses about 660 gallons per year. That’s more than the biggest energy user at the Village, the Spruce House, which used only 463 gallons of oil equivalent.

How do the homes save energy?

The homes are super-insulated and incorporate energy-saving features like heat recovery ventilation, triple pane windows and Energy Star appliances. The Willow House has a REMOTE wall with 8 inches of exterior foam insulation and 3.5 inches of fiberglass batts inside the wall cavity (for a total of R-51). That’s more than twice the insulation value of a conventional 2×6 wall with 5.5 inches of fiberglass insulation. Space heating and hot water are provided by a propane boiler and three solar thermal collectors.

The Spruce House, on the other hand, has a double wall filled with 18 inches of cellulose insulation (R-64), and a forced air heating system with a small diesel heater that heats fresh ventilation air.

Because each house has roughly the same heating load, the difference in energy use can be largely explained by the differing mechanical systems and the occupants themselves. What’s the set point of the thermostat? How long are the showers in use?

A cost analysis showed the Sustainable Village homes were competitive with other energy efficient building in the Interior — averaging about $185 per square foot, including water and wastewater, electrical, and roads (not including land).

CCHRC also monitored soil temperatures at the homes to study the effects of different foundations on the ground. The two western homes are built on permafrost, or permanently frozen ground, only 2-3 feet deep in the summer. The trick when building on permafrost is to isolate the house from the ground, so heat doesn’t leak into the soil and thaw the frozen ground (which can cause expensive structural problems). These homes used experimental foam raft foundations, steel floor joists with a thick layer of polyurethane spray foam designed to protect the permafrost.  Sensors underneath the house show that the foundations are working so far: the temperature at 4 feet deep has risen less than 5 degrees, and at 24 feet has remained the same.

See the full report on first year performance of the homes here.

Opening of the UAF Sustainable Village Wednesday, Oct. 3

The UAF Sustainable Village is a community for students who are passionate about the environment and reducing their carbon footprint. It is a collaboration between the UAF Office of Sustainability and the  Cold Climate Housing Research Center  to build and research energy efficient housing, renewable energy, and innovative heating and ventilation systems. Students at the Village make a commitment to sustainability through monitoring the systems, conserving energy and water, and helping develop additions like a greenhouse or community center.

On Wednesday we will celebrate the opening of the Village with a ribbon cutting on-site and words by CCHRC President Jack Hebert, UAF Chancellor Brian Rogers, student workers and student residents.

For more info contact Molly Rettig, Communications Coordinator, at molly at cchrc.org.

Wednesday October 3, 2012 at 12 p.m.

 

11:30—Press invited to tour the interior of a student home

12:00—Ribbon cutting & brief words by Chancellor Brian Rogers & Jack Hebert

12:15—Move to CCHRC for brief ceremony—student posters on display

12:30—CCHRC President/CEO Jack Hebert welcoming

12:40—Words from student on design/construction team – Skye Sturm

12:50—Words from student resident

1:00—Time for interviews

1:15-1:30—Optional public tour of a student home

UAF Sustainable Village Week 18: Interior finishing

It’s finishing time at the Sustainable Village! The devil is in the details, and we’re detailing ceilings, floors, corners, railings, trim, and everything else. The time lapse shows workers installing beautiful birch paneling on the upstairs ceiling as well as cabinets and appliances.

UAF Sustainable Village Week 14: Sheetrock, insulation & siding

We continued siding, insulating, and Sheetrocking in Week 14. We began hanging a reclaimed steel siding that came from old dredge pipe in the surrounding area. It will provide an accent to the metal siding, adding a cool aesthetic and historical value to the homes.

http://makinghouseswork.cchrc.org/

UAF Sustainable Village Week 13: roofing & cellulose

The Village now has roofs. Roofers came and installed the green rubber-based shingles on all four homes in a single day. We also blew in roughly 2 feet of cellulose insulation underneath the NW roof, which will have a continuous 2-inch air gap between underneath the roof deck to keep the roof cold and dry.

We continued building REMOTE walls on the NE home, which will have 6 inches of interior fiberglass insulation and 8 inches of EPS foam board for 2/3 of total R-value on the outside.

UAF Sustainable Village Week 11: spray foam, decking & Sheetrock

Week 11 was a productive one at the Sustainable Village. Workers continued to install EPS foam (2 layers of 4-inch sheets) in three of the homes with a REMOTE wall system. We also sprayed polyurethane foam around the rim joist to seal it up.

Each home has a large, south-facing deck on the second floor. We finished the decks with a spray-applied elastomeric coating, the same stuff used for truck-bed liners, a durable, weather-proof material that is less material-intensive than wood and requires no penetrations in the ceiling. We sprayed foam insulation underneath the deck in the first-floor ceiling to create a warm thermal break.

This week we started hanging Sheetrock in the homes where we had already finished plumbing and electric. The interior is starting to look livable! Now it’s time to select 16 lucky students who will make the Village home. If you’re interested, visit http://www.uaf.edu/sustainability/sustainable-village.

 

Sustainable Village Week 9

During Week 9, we installed ceiling vapor barriers, continued plumbing and wiring work, and started working on the electrical hook-up for the homes. After heavy rain over the weekend, and the ground is still frozen a few feet down, the site was temporarily transformed into a mud pit. This made it interesting to navigate heavy equipment and dig a trench for the power line. Nevertheless, we will have electricity by the end of the week!

Student carpenter on her view of the UAF Sustainable Village

Takpaan Weber is a UAF student from Anaktuvuk Pass, a small Iñupiat village in the Alaska Brooks Range. She describes her experience working on the UAF Sustainable Village and other low-energy experimental prototype homes she has helped build in rural Alaska.

Sustainable Village Week 8

Framing is underway on the 4th and final house. Workers began applying ceiling vapor barriers and Grace rain and ice shields (which act as a drainage plane) to the fully framed homes. Now we’re exploring options for siding and interior finishing, looking at a combination of donated, market-value, and reclaimed materials.

Framing, Floors & Slabs

We’ve made a lot of progress on the Sustainable Village this week—framed the first floor of the northwest house, started building the deck for the second floor, and poured concrete slabs for the two east homes.

The first floor of the first house was framed in a day. The 1,500-square-foot home has four bedrooms, a downstairs bathroom, upstairs kitchen, and big south-facing deck on the second story.

The beginning of the week was cold with scattered showers, so the concrete contractors waited until Thursday and Friday to pour slabs. The process took about two hours—the mixing truck and the pumping truck showed up and one of the guys poured the coloring (Santa Fe) into the mix. Then five guys worked together on the floor, spreading the “mud” from a rubber hose, moving it around with “mud sticks,” leveling the slab with a screed (or flat board), and smoothing and sealing it with a bull float (a long-handled tool with an aluminum float). Once the slab set up a bit, they went over it with a trowel (a flat, metal-bladed hand tool), which gets rid of any bumps and gives it a smooth finish. The slab is 1.5 inches with a pretty adobe color.

The crew is currently framing the second story. Next week students begin helping out on site.