New municipal building aims for Passive House Plus
By Oscar Flechas
The new Valleyview Town Hall is an 800 m² two-storey plus basement building located in Valleyview, 350Km north of Edmonton in the heart of Alberta’s oil country. Despite the large seasonal fluctuations in temperature and sunlight levels at this latitude, Valleyview Town Hall is aiming to be the first Passive House certified commercial building in Alberta and the first Passive House Plus in North America. This means that on-site renewables meet 100% of the building’s energy demand on an annual basis, a giant leap forward for a town with fewer than 2,000 residents.
The building reuses the footprint of a previous structure, minimizing site disturbance, preserving adjacent community park space and capitalizing on solar orientation. With the latter being a vital strategy in this extreme climate, the program is organized with high-traffic working areas towards the long, naturally-lit south side to ensure energy balancing. In the warmer months, heat gains are controlled with fixed shades that cut out the high angle sun.
In addition to its aggressive energy targets, the Passive House Standard requires excellent indoor air quality through carefully calibrated mechanical ventilation and air recirculation systems. To maintain steady temperatures over all three levels of the building, ventilation specifications included a mix of outdoor variable refrigerant flow (VRF) system for cooling and heating, and a high-efficiency energy recovery ventilator.
To further enhance indoor environmental quality, all interior finishes, paints, adhesives, flooring and composite wood products are specified to contain low amounts of volatile organic compounds (VOCs) and be free of other toxins. Beyond the physiological health of its employees, however, the municipality is also concerned for their psychological wellbeing. Accordingly, all workspaces and other frequently used areas are adjacent to operable windows that connect visually to the park, while a balcony and designated outdoor sitting area ensure that the connection with nature is not only visual but also physical.
Another Passive House requirement is for durability of materials and assemblies. The materials chosen, including glass fibre reinforced concrete (GRC), and high pressure laminate siding and metal siding which are both resilient and long lasting. The highly energy efficient envelope includes Passive House certified windows within a rainscreen system that promotes drying of any moisture that gets behind the cladding. Together with the airtight and vapour open construction this ensures there is no unwanted condensation within the wall assembly and extends the life of the envelope components.
In anticipation of changing needs over the life of the building, an area for future physical expansion is included within the existing Passive House envelope. Accommodating future expansion and reconfiguration meant that the size and spacing of the windows had to be carefully considered to accommodate potential changes to the functional layout.
- Owner/Developer Town of Valleyview
- Architect Flechas Architecture Inc.
- Indicative Design Kobayashi + Zedda Architects Ltd., ReNu Building Science and Williams Engineering
- General Contractor Scott Builders Inc.
- Landscape Architect Kinnikinnick Studio Inc.
- Civil Engineer HELiX Engineering Ltd.
- Electrical/Mechanical Engineer Integral Group
- Structural Engineer Laviolette Engineering Ltd.
- Commissioning Agent Bair Balancing
- Energy Modelling Marken Design+Consult
- Photos Flechas Architecture Inc.
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- The highly energy efficient envelope uses Euroline 4700 Series THERMOPLUS™ PHC Tilt & Turn windows in a rainscreen system that allows drying of any moisture that gets behind the cladding. Tech-Crete CFI® pre-finished exterior insulating wall panels are used on the foundation.
- The building reuses the footprint of a previous structure, minimizing site disturbance, preserving adjacent community park space and capitalizing on solar orientation. The foundation of Quad-Lock® Insulated Concrete Forms was supplied by Airfoam Insulation products which offers Insulation Boards, Insulated Metal Panels, Geofoam and Void-Fill for wall, roof and below-grade applications. www.airfoam.com
- The hallway leading to workspaces which have operable windows that connect visually to the park. The project uses a Tempeff North America ERV system with Dual-Core technology to recover both heat and humidity in winter for continuous fresh air supply and a frost-free operation in extremely cold conditions.
- All interior finishes, paints, adhesives, flooring and composite wood products are specified to contain low amounts of volatile organic compounds. To maintain steady temperatures over all three levels of the building, ventilation specifications included an outdoor variable refrigerant flow (VRF) system by Mitsubishi Electric Heating & Cooling for cooling and heating, and a high-efficiency energy recovery ventilator.
Ōko skin extruded concrete slats by Rieder are made up of glassfibre reinforced concrete, 100% non-combustible, available in a range of colours, requires no maintenance and individual elements can be replaced easily.