ME-KWA-MOOKS NET-ZERO
Located on a steeply sloped triangular lot in West Seattle adjacent to Me-Kwa-Mooks Park, this transformative Japanese inspired remodel was designed to improved access to the home, connect to views of the greenbelt and frame territorial views over Puget Sound, all while improving interior flow. This house is also on track to achieve net-zero energy efficiency.
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The existing house suffered from three ill-conceived additions and remodels. The design opportunities and issues were plenty. The house was difficult if not dangerous to access via the driveway which was steep and lacked turnaround space. This prompted visitors to climb a street-side circular stair to arrive at either a questionable entry door or continue up another flight of stairs. Once inside, the spaces were fragmented and did not take sufficient advantage of their surroundings views or adjacencies.
The clients were adventurous and willing to explore design solutions rooted in their experiences. Having lived in Japan they enjoyed both traditional and contemporary design elements, from the concept of the tea room to Studio Ghibli to contemporary Japanese architecture. They sought a balance of old and new, crafted and minimal. Both had been professional circus performers, bearing an affinity for open, dynamic spaces. What the clients desired was not more space, but better designed space–to live in rooms engaged with one another and to the outdoors.
The solution was informed by designing around the central hearth and by reducing the jumbled exterior form of the house into two integrally linked volumes. The exterior relationship was carried into the interior, so the form is present both outside and inside the home. The result is a clearly legible exterior while on the inside the space is very dynamic, with volumes linked together through views and circulation.
PERFORMANCE UPGRADES
High performance envelope with ACH of 1.2
Exterior insulation
High Performance windows, GLO Triple Pane Passive House
High efficiency HVAC
Solar panels
Dual electric car chargers
CURRENT HOUSE PERFORMANCE W/ UPGRADES
Total Project Energy Use Index (Total EUI) = 10.3 kBTU/sf-yr
Grid Project Energy Use Index (Total EUI) = 3.9 kBTU/sf-yr (this excludes energy offset by PV)
MECHANICAL
Heating cooling – High Efficiency Epoxy Coated 3 Ton Mitsubishi Electric Heat Pump
Heat Recovery Ventilator (HRV) – Life Breath 205Max
High Efficient Water Heater – Rheem Professional Prestige Hybrid Electric Heat Pump
Low flow plumbing fixtures 1.75 – 1 GPM or less
SOLAR
System Size – 10.95kw
Power Offset – 71.6%
Approximate Cash Positive = 12.2 years (based off typical house and their usage)
(2) Tesla Car Chargers
ENVELOPE
Blower door test – ACH @ 50 Pa = 1.23
Windows/Doors – Average Weighted U-Value = .19
Exterior Wall R-Value = R24+continuous R8 (TOTAL = R32)
Roof R-Value = R65
Floor R-Value = R53++continuous R8 (TOTAL = R61)
PROJECT INFO
Location | Seattle, WA
Project Architect | Aaron Trampush
Architect of Record | SHED Architecture & Design
Contractor | Dowbuilt
Structural Engineer | Todd Perbix
Metal Siding | VSM Sheet Metal
Cabinets | Whidbey Design Works
Concrete | Bayshore Concrete
Interior Steel | Alpine Welding
Solar | Artisan Electric
Enclosure Consultant | RDH Building Science
Windows and Doors | Washington Window and Doors
Photography | Rafael Soldi, Tony Kim (aerial)