Water in liquid form (e.g., rain) will (mostly!) go down with gravity, and so overhangs will help a lot, as will proper grade sloping away from your foundations

Water in liquid form (e.g., rain) will (mostly!) go down with gravity, and so overhangs will help a lot, as will proper grade sloping away from your foundations. Water in vapour form will be more diffuse and be everywhere the air is. Further, your cladding / water control layer (which deals with rain (and UV)) generally needs to be open to air so that it can dry properly: * https://en.wikipedia.org/wiki/Rainscreen https://en.wikipedia.org/wiki/Rainscreen so that can lead to moist air getting places that water may not, and if you don't have insulation between the warm-moist outside and the cool-dry inside: * https://buildingscience.com/documents/insights/bsi-001-the-perfect-wall https://buildingscience.com/documents/insights/bsi-001-the-p... problems can start.