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|Vital Stats |
|Location: Ballard |
|Star Level: 4-Star |
|Checklist: Single Family and Built Green Refit |
|Verifier: Tadashi Shiga, Evergreen Certified |
|Section ||Points |
|Site and Water ||91 |
|Energy Efficiency ||92 |
|Indoor Air Quality ||56 |
|Material Efficiency ||87 |
|House Size Multiplier ||1.05 |
|Total Score ||342 |
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On this Ballard site, Greenleaf Construction saved and completed a Built Green Refit on the existing home on the property, while adding two new 4-Star units in a great example of combining density with historic preservation. The green refit of the existing home started with improving the homes energy efficiency with an energy retrofit. The home was air sealed and leakage tested, and the attic was insulated to R-44. The existing single-pane windows were replaced with double pane windows with a U-value of 0.29. A new tankless gas water heater was installed, along with an Energy Star refrigerator and high efficiency light bulbs for at least 50 percent of the homes lighting. Water pipes were insulated, ducts were sealed with low-toxic mastic and programmable thermostats were installed.
As a measure to reduce both water use and energy efficiency, low flow showerheads were installed in each of the showers, as well as a water-wise dishwasher and low flow toilets. Outside of the home, a rain garden was installed to improve infiltration on the site. To improve indoor air quality, existing carpeting in the home was removed and replaced with hardwood. Formaldehyde-free insulation was installed, and a shoe removal area was designed at the home's entry. On the materials efficiency side, at least 85 percent of the construction waste was recycled, and removed materials were re-used or donated. Finally, rapidly renewable flooring and salvaged materials were installed.
Similar strategies were employed on the two units that were added to the site to bring them to the Built Green 4-Star level. Blown-in recycled content and formaldehyde-free insulation were used to bring the walls to a true R-23. A 95-percent efficiency gas boiler provides the radiant heating and on-demand hot water for the home, and a full suite of Energy Star appliances were used. As a result, the energy model showed a 15-percent improvement over the current energy code.
Indoor air quality was addressed through material selection and a focus on limiting toxins in the interior. Ceramic tile, pre-finished wood flooring, whole home radiant heating and limited use of carpet all help to limit the amount of dust in the home. Low-VOC paints, formaldehyde-free insulation and ventilation after application of new finishes helped limit chemicals in the home. Finally a rainscreen siding system limits the likelihood that water will get trapped behind the siding and cause mold.
The infill site is centrally located within walking distance to restaurants, bars, shops, public transportation and other amenities. Site landscaping features pervious patios and walkways along with drought tolerant plants to promote effective infiltration of water and low watering requirements. Dual-flush toilets and high efficiency showerheads and faucets were installed to reduce in-home water use.
Finally, on the materials side, extensive use of recycled materials were used including recycled content ceramic and glass tile and recycled-content countertops. The Hardie plank and metal siding also feature recycled content, as does the insulation and carpet pad. CDL Recycle provided a 90% recycling rate for the construction waste.
Merely a list of features does not do justice to the complete project though. While most builders choose to scrape the site and start fresh with a new project, a lot of effort went in to preserving the existing home on the site, providing a balance between the old and new, between the historical character of the neighborhood and the acknowledgment of the fact that that character is changing, along with the demographics. This project is Ballard in a microcosm, a bit old and a bit new, urban amenities with a suburban feel - and definitively green.
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|Photos courtesy of Vicaso |