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Wetting of the wall
Storyboard 
Every time it rains, the relative humidity reaches values close to or equal to 100%. This means that the air is saturated with water, and any surface will absorb molecules until it forms a water film. This film will tend to slide due to gravity, starting to "drip" down the wall. Additionally, there is a film of about 120 nm that remains even after the rain stops and must be removed through the drying process to prevent the formation of mold, which can degrade the wall.
ID:(113, 0)