What is a stack vent?

A stack vent is an extension of the waste stack that extends above the roofline of a building. Its primary purpose is to allow sewer gases to escape and to maintain proper air pressure in the plumbing system. By ensuring that these gases can vent outside, the system helps prevent potential hazards, such as sewer gas buildup, and contributes to the overall functionality of the plumbing system.

This venting mechanism is crucial for maintaining the proper flow of wastewater and preventing vacuum conditions that could lead to slow drainage or siphoning of traps, which could otherwise allow harmful gases to enter living spaces. Thus, understanding the role of a stack vent is essential in construction and plumbing practices to ensure safe and effective waste management systems.