A great discussion of a slew of choices for cathedral roof systems: solid-sawn rafters vs scissor truss, smart vapor retarder vs poly, optimal roof pitch(es), venting topside vs underneath vs unvented. And then the last 10 minutes cover a pesky building science phenomenon: what the heck is 6-sided containment of air-permeable insulation, and how does that connect to attic insulation R-values? PETE'S RESOURCES:
GBA "Five Cathedral Ceilings That Work"
BSD-149: Unvented Roof Assemblies for All Climates
"Convection in Loose-Fill Attic Insulation - Measurements and Numerical Simulations"