No. 4 Newsletter of the straw bale building community in and around Pueblo County, Colorado. Topics included attaching a deck to a straw-bale house, moisture issues in bale walls, and stucco technology. If it isn't a gross leak, like from windows, it's usually interior air moisture that gets into walls.
Testing shows most conventional building materials are permeable to vapor.
But if the wall can dry to the outside, the moisture in the wall won't cause problems. Junction boxes and the like have a lot of air movement with moisture. Concentrate on careful sealing around outlets, doors, and windows. You want a tight interior seal, a looser exterior. Don't vent your clothes dryer indoors.