The Task Group (TG) Chair reported meeting with other task group chairs and highlighted the need for additional Part 3 expertise on the Overheating TG, given its responsibility for both Part 9 and Part 3 requirements. The primary objective of the meeting was to establish three working groups to advance key issues before year-end.

Staff and the Chair reviewed action items and discussed next steps, including research support required from the National Research Council (NRC). Several actions were removed based on member feedback. Industry members confirmed that single-zone cooling will be included in the next version of CSA F280 and noted that Heat Loss/Gain softwares are now being updated to include modules for designing single-zone cooling systems (permitted in British Columbia). A BC government representative stated there is currently no formal verification process to confirm when mechanical cooling is unnecessary, leaving decisions to designers and authorities having jurisdiction while awaiting a national approach. 

Members volunteered for three working groups to:

1. Review software for developing overheating requirements and supporting performance compliance.
2. Develop alternatives to mechanical cooling, including passive measures.
3. Identify key factors such as heat duration and intensity.

It was confirmed that association members, including CHBA staff, cannot participate in these groups. Codes staff will follow up with absent members and circulate proposed scopes for TG approval. 

CHBA recommended revisiting NRC’s basis for the 27°C threshold, as part of the TG' work on factors, since it's important to know what factors NRC originally took into consideration when determining the safe threshold for overheating.  NRC will present their most recent research findings at an upcoming meeting.

For any questions, please contact Frank.Lohmann@chba.ca