Summary
Highlights
The discussion begins with the difficulty of creating construction drawings and details, especially for firms undertaking their first Passive House project. The speaker highlights the need for a shared database of tested details to avoid re-inventing the wheel for every project. Australian and BC Hydro databases are mentioned as existing, albeit underutilized, resources.
The speaker emphasizes that detail development and PHPP modeling are time-consuming processes that require several rounds of revisions and input from enclosure engineers. Delaying this work until late in the project can lead to significant delays and cost overruns. Panelized construction systems are presented as a way to streamline this process as they come with pre-modeled details.
The discussion covers the timing of PHPP modeling and certifier engagement. While ideal to model as soon as information is available, a formal submission to the certifier is suggested at the end of Design Development (DD) with a 10% buffer. The idea of having an in-house person who understands PHPP modeling to facilitate design feedback is also debated, with a consensus on the value of a 'shepherd' or champion within architectural firms.
The construction document phase is identified as a critical period where architects often accelerate work, leading to frequent changes. Clear communication and agreed-upon milestones for sending PHPP models and plans to the certifier are crucial. The importance of a buffer in PHPP calculations is reiterated to accommodate minor changes during construction documents without derailing the project.
The speaker proposes a structured approach to certifier reviews, including 'pre-submission guidance,' a 'preliminary review' at the end of SD/early DD, a 'design stage review' during mid-to-late CD, and post-construction assessment. The need to adapt these stages based on project-specific deadlines, like funding or city planning, is acknowledged.
While the certifier reviews documents, the local team should pivot to engage with constructors. This includes discussing training for site personnel and identifying key roles like the air barrier supervisor or Passive House coach. Hiring a builder or a builder's representative early is recommended to streamline the process and ensure adequate training and communication.
The importance of establishing clear communication procedures and defining roles on site is highlighted. A specific meeting involving the design team, construction team, and key sub-trades is suggested to go over Passive House documentation and inspection requirements. The 'air boss' or air barrier supervisor's role in flagging issues and maintaining open communication with consultants and architects is emphasized. The speaker stresses that an upfront full-day kickoff meeting, although expensive, saves money by avoiding costly change orders.
The discussion concludes with further key milestones and strategies. Daily site walks by the air supervisor, clear procedures for site visits and reporting, and integrating air barrier testing schedules are crucial. The need to involve mechanical teams for insulation and duct airtightness, particularly commissioning ventilation systems, is identified as a common oversight that can lead to significant problems.