What is a T-Joint in roofing?

A T-Joint in roofing refers specifically to the intersection of three or four membrane sheets. This is a critical aspect of roofing design, particularly in flat or low-slope roofing systems where multiple layers of membrane are used to ensure waterproofing and structural integrity. At the T-Joint, careful overlap and adherence are essential to prevent water leaks and maintain the durability of the roofing system.

In contrast, the other options describe different components or features in roofing but do not define a T-Joint accurately. While a connection point for roofing beams is relevant in structural roofing, it does not pertain to the specific junction created by membrane sheets. Similarly, roof vent designs relate to ventilation systems and do not encompass the concept of a T-Joint, while a joint used in metal roofing refers to a different context relating to fastening and securing sheets of metal, which again does not capture the unique characteristics of a T-Joint in membrane roofing.