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Novoclimat and LEED guidelines maximize energy efficiency

The Québec-based Novoclimat program promotes construction of energy-efficient residences.

To achieve Novoclimat status, a multiple-unit residence must be heated by “electricity, natural gas or residual forest biomass,” according to Transition énergétique Québec (Energy Transition Québec), the agency overseeing the program. “It is estimated that a new Novoclimat home enables its occupants to save 20 percent on energy costs in relation to a house that complies with the Québec Construction Code,” states the agency. 

In addition to structural thermal breaks, Novoclimat features include “better temperature control through the use of electronic thermostats, a mechanical ventilation heat recovery system that draws fresh air into the main rooms,” and “superior insulation and energy-efficient windows that help keep warm air inside in winter and cool air inside in summer.”

Energy-efficient windows at Un Toit Vert feature argon filling, double-glazing and two low-emissivity coatings. The central ERV (Energy Recovery Ventilator) provides fresh air to units while an electric heating system, including baseboard heaters controlled by thermostats, keeps tenants warm. The building exterior is girded by semi-rigid insulation board over 100mm thick to prevent thermal bridging of the steel framing. Un Toit Vert “has a really good envelope with an R-value of 27,” Allard states.

Under LEED Multifamily Midrise (more than four levels) guidelines, builders amass points toward certification for installing energy-saving features.  Certification is granted for reducing annual energy use by at least six percent compared with the baseline building performance set by ASHRAE 90.1

The “vegetated roofing” on top of Un Toit Vert earns LEED points in the “heat island reduction” category. Heat islands develop when urban structures and hardscapes raise localized temperatures on warm days. Plants and greenery impart a cooling effect that diminishes the impact of heat islands.

The central energy recovery ventilation system also gains LEED points.

The Un Toit Vert team aims “for 25 percent in energy cost reductions in comparison with the ASHRAE 90.1 reference, which establishes a benchmark for energy-efficient building design,” states Frédéric Allard.