Caulking is mandatory at all joints or contact surfaces between stucco finish and windows, doors, flashings etc in order to entirely prevent moisture from penetrating the stucco system. Life expectancy of caulking bead is around five years. That is why it requires proper inspection, first after is applied to ensure proper application and every five years after. Identifying deteriorated caulking in time will save you a lot of trouble and money. Dymonic ,Tremco, Spectrem Dymeric are just few of the industry’s large used sealants.