There is a sweet article about us in our local paper this morning. Hopefully we can keep building and make eco-friendly building the norm.
This year on the Green Home Tour we will be featuring our brand new standalone home Unit #12 as well as showing the soon-to-be occupied Unit #13. Units #6 & #7, a duplex with smaller footprint units, are next on the construction schedule. If you’ve ever contemplated relocating to a new highly efficient home in a close-in creekside community, now is your chance!
During the Green Home Tour, you can look at the creek restoration progress, see the fabulous Mini B (our 300 sq foot passive house) and check out our gardens, solar systems, and electric car charging station – where you can charge on us during your visit.
Unit 12 is our largest unit at 1832 sq ft and has 3 full bedroom and two bonus rooms and overlooks a large wetland area. It is under construction and is a great time to get involved and design your layout and green features. 5 Star Built Green means that it exceed the current energy code by 30% and has many green features – recycled products, LifeBreath Heat Recovery System, and Forest Stewardship Certified wood products.
Unit 6 and 7 overlook our creekside conservation easement and can be designed for a small one bedroom home up to 3 bedrooms. We are designing these now.
The Clearwater Commons is equally 16 miles north of Seattle and Bellevue on North Creek in South Snohomish County. We are five minutes off of I-405 for easy commuting. We have a seven acre site with shared creekside trails, garden, workshop and storage shed.
So if you are looking for a rural oasis in an urban setting; if you want to live in an environmental restoration area with salmon spawning out your front door; and, you are wanting to share some garden, community, and generally friendly folks, Come and Visit!
Check out the pictures of the new construction at the Commons! One is even a time lapse of the framing of the first floor walls and the pin pile foundations.
by Tom Campbell (unit 16/farmhouse)
Although the Clearwater Commons has always exceeded in its green building and site standards, for our next units we are going Built Green. What does this mean?
Built Green homes are designed to provide homeowners with comfortable, durable, environmentally friendly homes that are cost-effective to own and operate. These resource-efficient houses are crafted to exceed building codes and provide homeowners with years of healthy, quality living, while protecting our families and the precious Northwest environment. At Clearwater Commons, Built Green is a way to document our green building techniques and commitment.
The next unit to be built, #13, will follow the Built Green certification process. A local certifier who will document that we meet or exceed standards for every element of the building; all certifications will be verified by a third party. A major challenge is how to achieve a 5-star Built Green level while keeping costs low. We have spent considerable time this spring value engineering the specifications and using energy modeling software to develop trade-offs for how to go high level green inexpensively.
For example, each of our current units have a heat recovery ventilator. At this time we are looking to use other insulation and heating methods to exceed current energy code by 30%. Adding a hybrid hot water system, ductless mini-split energy method, plus a good insulation and sealing package will provide the energy efficiency at a greater savings.
A prospective owner at the Commons can steps in anytime during the construction process to add green components such as solar, heat recovery ventilators and other efficient appliances–go as green as you want. There are many new innovations in building science and our hope is to add ideas and experiments at the Commons. We’ve already demonstrated significant green benefits through our low impact development techniques. As a model low impact project, all of our stormwater is infiltrated, rain gardens support run-off, and paths and parking are pervious. Living along an endangered salmon run has also provided a laboratory for how building and stream restoration can go hand in hand.
We plan to partner with Built Green and other partners in Snohomish County to hold “behind the walls” tours at key stages of the building process. For now, we welcome prospective buyers to come visit us during the Green Home Tour (Sat. April 25, 11am-5pm) and get a close look at the unique property and buildings at the Clearwater Commons.
by Eric Dolven (unit 5)
A couple of years ago, the Clearwater Commons installed a 9.2 kW solar PV array on the roof of a shared building. Since that time, two families have decided to lease Nissan Leaf electric vehicles and use the solar array for charging needs. Of course the PV system is grid tied, so even if the array did not have the capacity to charge the vehicles, the energy would still be pulled from the grid. However, I got curious about how many Leaf miles our array could fully support. So here is the data.
The inverters we installed provide 1 year of on-board data logging, January 1 to Dec 31. We currently do not download this data. As a proxy, I simply looked at the inverters and noted that our 9.2 kW array produced about 9000 kWh of electrical energy in 2014. If we had full, direct sun 24/7, that array would produce 80,592 KWh of electrical energy over the course of one year. Given roughly half the year is night and half is day, the value corrects to more like 40,300 kWh. And since solar intensity is roughly sinusoidal, and the average of a sin function over half a period is 2/pi (= 0.64), we could generate a maximum of roughly 25,800 kWh in a year. So we have about 35% efficiency based on the 9.2kW specification. This reduction is primarily a function of the cloudy weather in the winter months. Functionally, the array is a 3.2kW system.
So back to the question of how many Leaf-miles the array can support. To answer this, I have started monitoring the energy efficiency of our Leaf. On average, the on-board computer reports our personal driving habits yield about 4 mi/kWh. Based on this, the 9000 kWh annual budget provided by our PV system would allow us to drive 36,000 miles per year. With a 12,000 mile limit stipulated in our lease agreement, this would allow three Leafs to be charged, fully supplied by our PV array.
Of course, there is a hitch. The efficiency value I used is based on the car’s output; into how many miles does the energy stored in the batteries get converted. Behind this is the issue of filling those batteries. Charging is not a 100% efficient process. If we charge the car on the 110V charger that comes with the car, we actually get 2.7 to 3.0 mi/kWh. Using these numbers, the PV array can only provide 24,300 to 27,000 miles. Closer to two Leafs. The balance gets lost in the imperfect battery charging. But the story isn’t over. Charging with a 240V charger is much more efficient than with 110. But right now, I don’t have a good way to measure the charging of the 240V charger. So the true answer is that we could support more than two, but no more than three Leafs on our solar PV system.
An interesting side note is that if we use the solar power to fully charge those three hypothetical Leafs, it would save us 1200 gallons of gasoline each year (assuming cars that get 30 MPG). That converts to roughly 13 tons of CO2 gas that is not being released into the atmosphere.
This Saturday – April 26, 11am-5pm – Clearwater Commons is featured as a site on the NW Green Home Tour. Come by to tour our homes, shop, gardens and creekside acreage. While you’re here, join our free workshops, scheduled throughout the day.
This workshop presents the basics of setting up a photovoltaic solar array on your home to power an electric vehicle (or anything else). Using the Commons’ set up as a model, you’ll everything from getting State approval to prepping the site to maximizing rebates and tax breaks. Charging station available!
Most units at Clearwater Commons are built on pin foundations: a solid pin pile foundation that reaches deep into the ground without digging holes or pouring concrete. Simple to install, these foundations avoid excavation, thus reducing concrete use, saving fuel and precious topsoil, while preserving natural drainage.
Reclaimed Wood Finishes in Unit 5
3:30am at unit 5
Lower your consumer footprint and save money by using reclaimed wood throughout your house. Unit 5 spun stories into their finishes with antique Douglas Fir from a 1894 Poulsbo house, Madrona from a conservation easement on Vashon Island and a variety of species from an “urban sawyer” in Tacoma (to name a few). Come see the result while getting tips, advice and sources of wood.
The warming temperatures, rain and turn of the season has things popping UP all over the place at the Commons. Frogs music’s turned up loud through both day and night.
There’s a lovely spot just west of the shop where we are building an orchard garden. It features fruit trees, a garden path and an arbor. Stay tuned for more posts and pictures. Here’s a little video with some of the action.
by Eric Dolven
We’ve been living at the Commons for almost a year and I’ve been curious how energy efficient our house really is. We spent extra money for a ductless mini-split heat pump, double paned Anderson-100 windows, a heat recovery ventilator, (all pictured here) blown in fiberglass insulation, energy star lighting and appliances, and I’m getting curious how much our energy bills are reduced by these measures. Of course I can’t answer that question because this is a new house, but I can compare how much we are paying now versus how much we were paying at the same time last year in our old, leaky, drafty Seattle house.
Since we don’t have a gas line anymore, all of our energy comes in as electricity. Heat, hot water, cooking, lights. So it’s hard to single out heating costs. But assuming the largest utility cost comes from heat and that we are lighting and using hot water in the same way, it’s probably fairly accurate to compare total energy cost of the old house with total energy cost of the new house. So what
I’ve done is gone back and compared our utility bills from roughly June 1, 2012 (when we moved in) to the present, with the equivalent bills from the same time the previous year.
by Shawna Lee
After many hours of rain, North Creek was overflowing its banks again, although it was not as high as it was a few weeks ago. Bob and I walked down to the creek edge this morning to see it. The power of that much water always feels exciting, and it’s fun to see how the bigger volume of flowing water has changed and shifted the contours of the banks and stream bed, not to mention loose objects beside the creek like the logs of the fire pit.
A cute little American Dipper was bobbing up and down at the flooded edge of the creek. It is such a soft gray and blends so well into the background of gray water that I didn’t see it until I had gotten fairly close to it. I stayed still and with no alarm, it continued to bob and poke into the shallow water for aquatic insects, their larvae, and maybe even tiny fish.