Einar Halbig of E3 Eco Group presented this webinar on: why airtightness is important for P3 buildings; components of a P3 building’s air barrier and their relative importance in ensuring airtightness; details about the final blower door test and how to prepare for it; and best practices and lessons learned for making P3 buildings airtight. The Township of Langley Green Buildings team also gave an update at the beginning of the presentation on upcoming P3 Non-Residential Step Code adoption and associated consultation, the Township of Langley’s Green Building Rebate Program, and a Compliance Talk by our Building Energy Specialist, Ajeen Surendran.