Originally Posted by
SAL IACONO
All framing and sheathing appears to be wood.
I would recommend they take two areas, one of the worst areas and one of the best areas, remove the gypsum board from inside, remove the insulation, then check the condition of the wood framing and wood sheathing. There may be significant wood decay going on.
With the sheathing being wood, they may have a stucco problem in that they likely did not use a WRB behind the paper-backed metal lath, if they even used paper-backed metal lath and not 'just metal lath against the wood sheathing'.
With all those exhaust fans they surely have running, they may be depressurizing the interior, which would draw moisture laden air through the walls (if they do not have enough fresh air return to equalize the pressure).
Do you have a manometer to measure pressure differentials? It does not take much pressure differential to create a driving force for that moisture.