Drainage of rainwater, melted
snow, roof water, other bulk water (lack of or improperly installed
flashings)
Capillary
Action
Or Wicking of moisture through
porous materials due to surface tension causing natural
suction
Diffusion - also called
Osmosis
When water passes through a
semi-permeable membrane into an area of lesser concentration thus
equalizing the concentrations on either side of the membrane
Air
Movement
Water carried in the air by air
movement due to pressure differences