The Press Bay Alley project now has framed interior walls along the western side with spray foam insulation going the full length from floor to ceiling instead of fiberglass insulation. Spray foams have been common in new home construction since the 1970s and are seeing wider use in many insulation applications nowadays due to their superior thermal resistance (R-values) and tax incentives for residential building envelope improvements. A typical home has a significant portion of their thermal loss attributed to barriers with insulation, so improvements in insulation are commonly the “low-hanging fruit” for energy cost reductions. Snug Planet does a lot of insulation work locally, and has some case studies online for those interested in browsing a few thermal-efficiency projects.