Energy efficiency – buildings
What is the National Energy Code of Canada for Buildings?
Answer to question 1:
The National Energy Code of Canada for Buildings (NECB) is one of several model codes published by the National Research Council of Canada (NRC). The NECB replaces the Model National Energy Code of Canada for Buildings 1997 (MNECB). As with other Codes, it was developed by the Canadian Commission on Building and Fire Codes (CCBFC), an independent committee of volunteers established by NRC, and published by NRC. The NECB is a model for provincial and territorial regulations and must be adopted by an authority having jurisdiction to come into effect. In some cases, it may be amended and/or supplemented to suit regional needs, and then published as a provincial Code.
How was the NECB developed?
Answer to question 2:
The NECB is the result of an extensive consultation process involving stakeholders from multiple levels of government (federal, provincial, territorial and municipal), the construction industry, and the general public. It was developed by the CCBFC, with technical support and funding provided by NRC and Natural Resources Canada (NRCan) as part of its commitment to improving the energy efficiency of Canadian buildings and reducing greenhouse gas emissions.
What’s new in the 2017 NECB?
Answer to question 3:
The NECB 2017 reduces the overall thermal transmittance of roofs, fenestration and doors; reduces losses through thermal bridging in building assemblies; and, reduces the allowable percentage of skylight area. This new edition also introduces more stringent requirements for energy recovery systems and interior and exterior lighting requirements. It requires temperature controls in individual guest rooms in hotels and motels and demand control ventilation systems in commercial kitchens. In Part 4, it clarifies the lighting trade-off path requirements and in Part 8, it makes performance compliance requirements consistent with prescriptive requirements.
What’s new in the 2015 NECB?
Answer to question 4:
The 2015 NECB includes over 90 changes improving the overall energy performance of buildings over the 2011 edition. The 2015 edition broadens the scope to address all service water and introduces requirements for pressure-sensing controls which reduce the short-cycling of booster pumps when demand for water is low. Other HVAC and service water changes include equipment efficiency regulation of heat rejection equipment, such as cooling towers and (standalone) condensers, heating performance requirements for gas-fired outdoor packaged units and updated minimum pipe and duct insulation requirements. Lighting power density values and controls have been updated with more stringent lighting allowances and additional requirements for common spaces and exterior applications. The performance path modeling rules and guidance have been updated to reflect the changes to the prescriptive path as well as more current typical use profiles of buildings. Application of the code for residential and small buildings has also been clarified.
Why is there a 2015 and 2017 edition of the NECB?
Answer to question 5:
NRC and NRCan published an interim edition of the NECB in response to proposals received that improve the overall energy performance of buildings over the 2015 edition. Modelling for these changes indicates a potential energy efficiency improvement of between 10.3 and 14.4 % over the NECB 2011. The 2017 edition is an important step toward Canada’s goal for new buildings, as presented in the Pan-Canadian Framework, of achieving ‘net zero energy ready’ buildings by 2030.
What is the scope of the NECB? Is there going to be an energy code for houses as well as for buildings?
Answer to question 6:
The NECB applies to all buildings in Part 3 of the National Building Code of Canada (NBC). There will no longer be a National Energy Code for Houses. Instead, energy efficiency requirements for housing and small buildings are incorporated into Section 9.36 of the NBC.
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