What term is used for gaps where self-sealing laps did not seal properly?

The term used for gaps where self-sealing laps did not seal properly is "fish-mouths." This term refers to the irregular and unintended openings that can occur in materials like sheeting or flashing when the overlap does not adhere correctly or fully. The appearance of these gaps resembles the shape of a fish's mouth, hence the name. Recognizing and addressing fish-mouths is crucial in plumbing and construction to prevent water intrusion, air leaks, and other potential issues that could compromise the structure's integrity.

In contrast, the other terms represent different concepts. Air pockets can occur in various contexts but do not specifically refer to sealing laps. Seep holes typically refer to small openings that allow liquid to escape or seep through a material, which is not the same as a failure in sealing laps. Ventilation gaps refer to spaces intentionally left for airflow but are unrelated to the sealing process of materials. Knowing the terminology and their correct applications is essential for effective plumbing practices.