Revisions log for Answer #1709

You already have a vapor barrier and insulation on the inside. Vapor barrier is good, and the insulation on the inside is not so good. Do not destroy the vapor permeability of the wall from the outside. If you insulate, then wool and ventilated facade.There is a chance that the wall will be dry.

Make a sandwich panel with foam block inside – EPS inside and outside the foam block, the wall will accumulate moisture sooner or later. Good luck.