Articles

Where Building Systems and the Building Envelope Meet: The Risk of Roof Penetrations

November 9, 2026

The building envelope serves a simple yet crucial function: keeping interior conditions in and exterior conditions out. Although roofing systems are typically designed to perform reliably for decades, failures most often occur at interfaces where different building systems intersect, including transitions, joints, and penetrations. Among the most common and consequential of these are mechanical penetrations through the roof. If not properly designed, installed, or maintained, these penetrations can create pathways for moisture and air intrusion, potentially leading to significant property damage. Understanding how these failures occur, the losses they can generate, and the investigative techniques used to identify their root causes, can help insurers better assess risk and support effective claims resolution.