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The Building Envelope Thermal Bridging Guide from BC Hydro provides a method for dealing with exposed slab edges and balconies, among other things like roof parapets, etc. The guide itself explains the approach and appendices A and B are where the detailed information is provided for the different architectural components.
Basically, you end up accounting for the thermal bridges (exposed slab edges, etc.) by derating the thickness of the insulation layer of the exterior wall construction to create the effective assembly U-value.