Mold requires moisture to grow, so identifying water vapor intrusion sources is crucial for prevention and remediation. Common sources include roof leaks, plumbing failures, HVAC condensation, poor ventilation, basement seepage, and window condensation. For property managers, understanding that high humidity alone can support mold growth means monitoring building systems year-round. Professional moisture assessment uses advanced detection equipment to find hidden sources like moisture trapped in wall cavities or under flooring. Facility owners should know that even minor plumbing leaks or HVAC issues can create widespread mold problems if not addressed quickly. Professional testing identifies not just existing mold but also moisture conditions that will cause future problems, allowing proactive maintenance that prevents costly remediation.