Meeting with colleges of ours to discuss the process of making this project a passive house. There are a lot of really interesting approaches to building a super efficient building envelop. Systems like:
All of these systems result in a wall that is at least 1’ thick.
(Reminds me of the Log Houses my Uncle built in the 1980s with the deep window ledges and reading nooks looking out side.)
The system we are leaning towards is the double stud wall system. Simple, less expensive but harder to air seal. We will implement an Airtight drywall approach to sealing this building (using drywall and paint to create the vapour barrier).