b9 architects
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b9 architects

Zola Windows
Product specificatie overzicht

ElementBedrijf Product Name
Heating/Cooling systemsMitsubishi Electric Trane HVAC US
Exterior Air Sealant productProsoco
Exterior InsulationThermafiber Inc
windows and doorsZola Windows

Product specificatie overzicht
Exterior Air Sealant product
by Prosoco
Exterior Insulation
by Zehnder
windows and doors


b9 architects als Architecten

VIEW HAUS 5 is Seattle’s first PassivHaus-constructed townhome project. It is an innovative approach to infill development on a typical Seattle 40-foot wide lot. Centrally located in the Madison Valley neighborhood, View Haus 5 was named for its five distinct home designs that share views of the Cascade Mountains while committing to the rigorous German standard for energy efficiency. Featuring one certified PassivHaus unit, all View Haus 5 units comply with the rigorous standards for design and construction set by the Passive House Institute US, requiring high-efficiency doors and windows, increased insulation, continuous air sealing and mechanical ventilation.

The project provides a site-specific thoughtful solution to density on a typical narrow Seattle infill lot. In response to the site, the five homes are organized around a central south-facing courtyard differentiating View Haus 5 from the typical Seattle townhouse project. The structure responds to the site’s topography, stepping the homes down from the street to the alley. Partially raised above the courtyard, the central dwelling frames a shared space for all residents at the center of the site.

Emphasis is placed on increased insulation and air sealing. The result is an 80-90% reduction in energy cost for heating and cooling compared to traditionally built homes. The design incorporates multiple Mitsubishi mini-splits for heating and cooling and a Zehnder heat recovery ventilator (HRV) for mechanical ventilation for each home. These sustainable strategies are accompanied by precisioncrafted air-tight European tilt and turn windows and doors, densely packed fiberglass and Roxul rockwool insulation, creating draft-free, homes that stay at a comfortable 70 degrees year round, and provide healthy, fresh, allergen and toxin-free indoor air.

Comprised with a mix of individually designed 3-story units ranging between 1,100 and 1,400 square feet, View Haus 5 utilizes large windows to bring in abundant natural light even on Seattle’s grayest days. Interiors include zero volatile organic compound (VOC) paints, sealants, adhesives and carpets, durable concrete flooring, water saving plumbing fixtures, locally-made cabinetry, all LED lighting, ENERGY STAR appliances and unit-specific electric car charging. 100 year-old reclaimed barn wood highlights exterior massing elements and interior entry volumes. The central shared courtyard features reclaimed wood siding and a bioretention cell to collect and mitigate roof runoff. The shared ground level courtyard space is complemented with private patios and upper level decks connected to individual living spaces as well as private rooftop decks.

View Haus 5 demonstrates a holistic approach to creating dense ground-related housing, highlighted by a collaborative process throughout its design and execution. Its goals and realization clearly articulates a commitment to promote sustainable, innovative, high quality design and construction. The massing is modulated to create a structure that is well-scaled to its surroundings. Parking is minimized on the site through its location at the rear of the site, adjacent to the alley, located below the structure. To minimize impact on adjacent sites, a single enclosed stair penthouse is located at the center of the site, integrated with the design's approach to interlocking masses of varying materials. The exterior materials include reclaimed wood siding, faux shou sugi ban wood siding and painted cement board panels, all installed over four inches of Thermafiber HD continuous exterior insulation. The ground surfaces include permeable pavers, cedar decking and drivable grass pavers at the parking area.

View Haus 5

Zola Windows als windows and doors

This multi-family development boasts Seattle’s first Passive House-constructed townhomes. Designed by award-winning b9 architects, inc. and constructed by Cascade Built, View Haus 5 has five distinct homes that were designed to appeal to a diverse group of buyers with a few commonalities.

Windows and doors from Zola’s popular, budget-friendly Thermo uPVC line were specified for the project, providing clean lines and striking views of the Cascade Mountains.

Zola Windows interviewed architect Bradley Kouri and builder Sloan Ritchie about the project. Brad Kouri is the principal and and founder of b9 architect. Sloan Ritchie is the founder of Cascade Built and a pioneer in Seattle’s residential green building market. A LEED accredited and Passive House certified builder, Sloan draws upon his understanding of building science and decade of experience as a green builder to construct the city’s most energy-efficient, high performance and long-lasting homes.

What was your design inspiration for this project? Bradley Kouri: “View Haus 5 was designed and developed with a holistic approach and with the intention to promote sustainable, innovative and high quality design and construction. The design process of View Haus 5 clearly demonstrates how architects and clients work together to reach innovative solutions. The site’s potential for adding meaningful density is balanced with a priority on design and building performance. The project includes the first Passivhaus certified townhouse in Washington state. It features locally sourced high quality, sustainable materials and relies heavily on building systems.”

What was the design challenge for this project? Bradley Khouri: “Our primary challenge was applying Passivhaus building performance standards to a multi-unit townhome project on a significantly sloped site. This commitment to the project’s goals required a significant collaboration between the client and architect as well as the consultants. Detailing with the goals of achieving Passivhaus produced a building that far exceeds code requirements and sets an example for how infill development can minimize its footprint and succeed in its market.”

What makes this project outstanding? Bradley Khouri: “The project displays an incredible commitment to design execution balanced with building performance. Thoughtful, simple architectural details and strategic systems are applied consistently throughout the project.”

What are your some of your favorite construction products used on this project? Sloan Ritchie: “Salvaged barnwood from Utah, site-reclaimed Douglas Fir rafters milled into window sills, mini-splits, and Zola tilt-turn windows.”

What product lines did you use from Zola for windows and doors? Sloan Ritchie: “Two of the units used the Zola Thermo uPVC tilt-turn, and 3 units used the double pane Zola Classic uPVC.”

Why did you choose these product lines? Sloan Ritchie: “We certified one unit Passivhaus, so we needed the performance of the Thermo, and wanted the tilt-turn with air tight gaskets for all the rest, even though we didn’t need quite as high a U-value performance.”

What is your favorite Zola product? Sloan Ritchie: “The Thermo uPVC tilt-turn.”

What do you like about Tilt-Turn windows? Why do you think more Americans might consider using them? Sloan Ritchie: “We already knew about tilt-turn windows. They are much better than leaky old sliders, but Americans don’t know until they see it. Because of my familiarity with tilt-turn windows (my wife is German and we visit often) I have been looking for opportunities to use them in our projects for years.”

What is the view you see from the windows or doors from the house? Sloan Ritchie: “Views are of the Valley, and some Cascade mountain range views, Mount Rainier, Mount Baker, and Mount Stuart.”

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Rancate, Switzerland - Gerealiseerd over 2019
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