Case Study

Vital Stats Location: Kirkland Star Level: 4-Star Checklist: Single-Family Section Points Site and Water 89 Energy Efficiency 105 Indoor Air Quality 109 Material Efficiency 128 Home Size Multiplier: 1.0 Total Score 387

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YS Development
1108 5th St., Kirkland

Located in Kirkland, Kirkland DUO is a modern, architectural beauty developed by YS Development. The 4-Star single-family home features partial green-roofs, drought-tolerant native landscaping, and dual-flush toilets to minimize site runoff and in-home water use. Built with a very tight envelope and a high-efficiency heating and hot water system, the home achieved certification by Northwest Energy Star Homes. YS Development was able to recycle over 90% of their construction waste and featured green finish products such as Forest Stewardship Council (FSC) certified Eucalyptus and Teak flooring. Finally, the home ensures comfort for the occupants through a system of fans, filters and systems intended to balance the tightness of the building envelope.

Site and Water Protection

• Built on infill lot
• Partially vegetated (green) roof system
• Retained trees on the site
• Amended soils to 10-12 inch depths
• Landscaped with drought-tolerant native plants
• Installed dual-flush toilets and faucets with GPM below code
• Minimized building footprint by not constructing garages

Energy-Efficiency

• Energy Star certified
• Tightly sealed envelope, blower door tested to 0.155 ACH
• Used advanced framing practices and airtight drywall approach
• Used gas water heater with an efficiency rating of 0.90
• Installed a heat-recovery ventilator
• Installed Energy Star appliances

Indoor Air Quality

• Designed shoe removal vestibule in home entryway
• Installed whole-home ventilation system with high-efficiency filter
• Garage detached or air sealed from the house
• Chose cabinetry with no added urea formaldehyde
• Selected low-VOC paints for major surface areas

Material Use

• Recycled over 90 percent of construction waste
• Eliminated materials that required finishes on 500 sq. ft. of area
• Used Forest Stewardship Council (FSC) certified Eucalyptus and Teak flooring
• Used recycledcontent hard-surface tile flooring
• Used wood composite and fiberglass-framed windows as opposed to vinyl
• Insulation contained a minimum of 40 percent recycled content
• Provided built-in kitchen recycling center
• Installed metal roof

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