If a roof is used for purposes other than weather protection, how high must the vent stack be above the roof?

When a roof is utilized for purposes beyond simply providing weather protection, such as for maintenance access or as a terrace, it is crucial that the vent stack is adequately elevated to ensure proper ventilation and to prevent any potential interference with the roof's function. The requirement for a vent stack to extend at least 5 feet above the roof in such cases is established to maintain effective air movement and to prevent backflow or obstruction of the venting system. This height also helps to prevent any adverse impacts from snow accumulation or other environmental factors.

Additionally, by having the vent stack at this height, it ensures compliance with building codes that govern plumbing and ventilation systems, which aim to promote safety and efficiency within plumbing installations. The specific 5-foot requirement underscores the importance of maintaining clear and unobstructed airflow, which can be crucial for preventing the buildup of harmful gases within a plumbing system.