Please compare the thermal insulation from the outside with the thermal insulation from the inside in terms of the conditions of water vapor condensation in the wall
Temperature distribution in the cross-section of the wall at the same internal and external temperature values:
When the wall has no thermal insulation, the temperature varies evenly throughout its cross-section. Condensation may occur in the outer wall zone.
When the wall is thermally insulated from the outside, the temperature drops sharply only in the insulation layer, where condensation may occur.
When the wall has thermal insulation on the inside, in the insulation layer the temperature drops sharply. Condensation of water vapor can occur throughout the wall area. Because with thermal insulation from the inside, the dew point is shifted towards the inside, such isolation only makes sense, if at the same time an insulating layer for water vapor is placed on the inside.