N8 Herndon House (Sun only)

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

The home is a 1910, single story, 850sf wood frame structure over a bare earth crawl space. Roof ridge orientation is North South. Includes a detached 130sf finished workshop.

Upgrades include:
• New foundation, earthquake resistance foundation ties, continuous vapor barrier, roof joist gusset bracing at peak
• Spray open cell foam insulation between floor joists (R28).
• Install continuous plywood sub-floor under engineered bamboo flooring to block air infiltration.
• Install blown cellulose wall insulation plus 1” older cellulose insulation/siding (R20+).
• Install new exterior doors, frames, and sills to stop air infiltration.
• Replace windows with double pane, fiberglass sash windows in the original house style.
• Use thermal scans to identify attic air leaks and install infiltration blocking material.
• Increase attic insulation to R50+.
• 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.
• Install standing seam metal roof in a light color to reduce attic heating in summer and improve rainwater quality for collection.
• Upgrade from 1,900 to 3,420 watt of PV panels with transformer-less grid tie inverter.
• Generate 97% of the electricity consumed annually 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.
• 96% of lighting using T8 fluorescent, CFL, and LED.
• Computer database of solar hot water conditions, PV generation, and house electrical use logging with real time system status display.
• 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.
• Use a clothes line for laundry drying in summer to reduce electricity use.
• 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.

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 heat pump.

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). Average daily water use is 20 gal per person, 75% less than last published Seattle per person residential average. Utilities use is tracked with a spreadsheet. Records go back ten years, giving direct visual reference to changes in utility consumption as projects are completed.

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