What is the significance of "secondary water intrusion"?

The significance of "secondary water intrusion" primarily relates to the concept of water entering a structure through unsealed penetrations. This term encompasses various ways that moisture can enter a dwelling, primarily due to improperly sealed areas such as around windows, doors, and exterior walls, as well as through cracks and openings in the building envelope. This type of intrusion often acts as a facilitator for further damage, leading to issues such as mold growth, structural damage, and deterioration of insulation and building materials.

Understanding secondary water intrusion is crucial for home inspectors, as it points to potential vulnerabilities in a building's defenses against moisture. Proper mitigation involves identifying these unsealed or poorly sealed penetrations and ensuring that they are adequately addressed to prevent water-related problems. This concept is broader than just plumbing leaks or roof issues, as it can arise from various points of entry around a home, making it an essential focus for maintenance and inspection practices.