High-performance, Multi-generational Home
The Risebrough Residence employs readily-available construction materials in innovative ways to achieve a future-proof dwelling for a young Toronto family. As extreme weather events occur more and more frequently, our clients wanted a home that would sip energy, endure for generations, and remain comfortable at all times. To achieve these goals, the architecture does the heavy lifting. The staggered rooflines accommodate high windows that admit daylight; while convection currents passively vent warm, stale indoor air through the upper windows and draw in cooler, fresh air from the garden level during the shoulder seasons. To reduce energy demand, the home is wrapped in a thick blanket of insulation; while an air-tight building envelope reduces unwanted air-leakage. Two fully-ducted energy recovery ventilators (ERV’s) handle controlled ventilation, ensuring the fresh incoming air is efficiently preheated and humidified by the outgoing exhaust air. As heating and cooling loads have been reduced passively by 80% over a typical home, the remaining heating requirements are handled by a hydronic in-floor radiant heating system powered by a super-efficient natural gas boiler.
A Blower-Door test was performed to review the building envelope for air leakage and ensure a continuous air barrier was achieved. From a pre-inspection reading of 4.30 ACH50 (Air Change per Hour at 50 Pascals), air leakage was identified, and air-tightness improved to yield a final reading of 1.7 ACH50—which translates to a 35% reduction in energy use from air-tightness alone.
Location: North York, ON
Area: 318 m², 3,425 ft²
Project Lead: Nicholas Discenza
Air-Tightness: 1.7 ACH
Mechanical: Alpha Comfort Control
Contractor: Greenbilt Homes
Total Energy Demand Reduction from Typical: 75%