Cladding is the application of one material over another to provide skin or layer intended to control the infiltration of weather elements, or for aesthetic purposes.Cladding does not necessarily have to provide a waterproof condition but is instead a control element.This control element may only serve to safely direct water or wind in order to control run-off and prevent infiltration into the building structure.ladding does not necessarily have to provide a waterproof condition but is instead a control element. This control element may only serve to safely direct water or wind in order to control run-off and prevent infiltration into the building structure.