External insulation to be compliant?

I think the language refers to interior or exterior walls...the diagrams in the reference guide provide better guidance. Insulation that is part of the exterior WALL (or floor, etc.) but inside the plane dividing interior and exterior will need to be accounted for.

Deborah, is this still the way we should see it, that only the interior side of exterior walls’ insulation is included? Seems logic, but you never know…   The figures in the v4 guide says where the pane between interior and exterior is, but it says nothing about what to do with that information, that that is the pane to include or exclude things. As this original post says, it says “whether part of building interior or exterior”, and then in the definitions of exterior: “building exterior - a structure’s primary and secondary weatherproofing system, including waterproofing membranes and air- and water-resistant barrier materials, and all building elements outside that system”. Very confusing!