NW8 105-Year-Old Sustainable House


Puget Sound Solar

808 NW 64th St
Seattle, WA

Sunday Only, 11am - 5pm

Site Description

Water Conservation, Energy Efficiency, Indoor Air Quality, Solar Power, Storm Water Infiltration, Urban Farming, Electric Vehicle Charging

The home is a 1910, single story, 850sf wood frame structure over a bare earth crawl space. Roof ridge orientation is North South.

The main structure air exchange is 0.31 per hour as determined by blower door test. The blower door test was done as part of an energy audit after most upgrades to confirm status of the remodel and direct final projects (solar PV upgrade and floor insulation).

The workshop is a standalone 130sf wood structure with cedar siding built on an existing concrete slab foundation from a previous garage. It is fully insulated (R18). A center section of clear roof panel and high side windows provide natural lighting with a double pane casement window for ventilation. It is fully wired with an 80 amp 240 volt electrical service. Heating is by portable heat pump.

Utilities use is tracked with a spreadsheets showing electric, natural gas, and water use. Records from utility billings go back ten years, giving direct visual reference to changes in utility consumption as projects are completed.

Solar hot water production, PV generation, and house electrical consumption are logged by computer every 15 minutes. The computer provides real time status displays for all systems.

Upgrades include:

• New foundation, earthquake resistance foundation ties, continuous vapor barrier, roof joist gusset bracing at peak
• Use thermal scans to identify attic air leaks and install infiltration blocking material.
• Spray open cell foam insulation between floor joists (R28).
• Increase attic insulation to R50+.
• Install blown cellulose wall insulation plus 1” older cellulose insulation/siding (R20+).
• Install new exterior doors, frames, and sills to stop air infiltration.
• Install continuous plywood sub-floor under engineered bamboo flooring to block air infiltration.
• Replace windows with double pane, fiberglass sash windows in the original house style.
• Install 2 tubular sky lights in north facing kitchen
• Install tubular sky light and greenhouse window in bathroom to increase natural lighting.

• Install on-demand gas hot water heater.
• Install evacuated tube solar hot water heater with 80 gal storage tank and proportional pump control.
• Install 98% efficient modulated gas furnace and increase insulation on supply ducts.

• Upgrade from 1,900 to 3,420 watt of PV panels with transformer-less grid tie inverter.
• 100% of the electricity consumed annually is generated on site.
• Inverter has Secure Power Supply (SPS) giving up to 1,500 watts of daytime AC power during grid outages.
• Replace all major kitchen appliances with Energy Star rated models.
• Use a clothesline for laundry drying in summer to reduce electricity use.
• Install a heat recovery system on the clothes drier.
• 98% of lighting is LED.

Average daily water use is 20 gal per person, 75% less than last published Seattle per person residential average.
• Install standing seam metal roof in a light color to reduce attic heating in summer and improve rainwater quality for collection.
• Install a three tank, 2,300 gal rainwater collection system with filtered pressure water delivery.
• Install a dual flush, low water volume toilet.
• Install a front loading, water efficient washing machine.
• Install aerators on all faucets and low flow shower head.
• Create a low water use yard landscape with attention to eye appeal.
• Unique pervious concrete driveway and walkway using washed river stone eliminating runoff.

• Purchase an all-electric car for use in the majority of local driving.
• Install a Level 2 (6K watt) charging station for the electric car.

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