Member Knowledge Centre
member Knowledge centre
The Knowledge Centre provides CHBA members with access to information and resources. It is a growing resource that is currently focused on updating members about national building code information. Please note that this information is a benefit of your membership, and should not be shared beyond your company/organization.
You can browse the items below, filter by category, or enter search terms in the "What are you looking for" box below.
National Model Code Committee on Climate Change Mitigation
National Model Code Committee on Climate Change Mitigation
November 18, 2025
One of the key topics discussed at this meeting was the inclusion of on-site renewables in the committee’s terms of reference, following direction from the Canadian Board for Harmonized Construction Codes (CBHCC). The committee decided to defer a deeper discussion on this topic to a future meeting.
Several Proposed Change Forms (PCFs) were reviewed during the meeting:
PCF 2057 - Energy Modelling Software: Proposed to update energy modelling software requirements to ASHRAE 140-2023 for the 2030 code cycle. Concerns raised about residential software compliance, documentation, and cost impacts. Codes Canada staff to revise and consult further.
PCF 2095 - Explanatory Notes on Insulation and Cladding: Proposed Appendix notes on fire performance and cladding support. Committee consensus was that these notes were unnecessary or potentially confusing, and the PCF was withdrawn.
PCF 2105 - Terminology Alignment: Approved a terminology update for “net sensible coefficient of performance” to align with ASHRAE and Canadian regulations.
PCF 1943 - Air Leakage Testing: Approved updating the referenced standard for whole-building air leakage testing to ASTM E3158 for improved accuracy.
PCF 1819 – Removing ACH50 from 9.36: This proposal had previously generated significant negative feedback during public review, largely because ACH50 is a widely used and understood metric in the industry. The committee decided to withdraw the PCF but agreed to refer useful components within the PCF to a relevant task group for further development, rather than discarding them entirely.
PCF 1822 – Thermal Bridging Requirements for 9.36: The proposed calculation methods were seen as too complex for typical residential construction and enforcement. The committee decided to withdraw the PCF.
The committee also reviewed the development of a new Tier 2 prescriptive package for new houses. This package, developed through modelling and cost analysis, sets out incremental improvements in building envelope and mechanical system requirements. The committee agreed to move this package forward for public review.
For more information, please contact alex.bols@chba.ca