Is it permissible to extend a shower drain with a dedicated vent beyond 8 feet to the main stack?

Extending a shower drain with a dedicated vent beyond 8 feet to the main stack is generally not recommended due to potential issues with drainage performance and venting effectiveness.


The Uniform Plumbing Code typically limits the distance for horizontal drainage runs between a fixture and the vent to prevent drainage problems and ensure proper venting.


Exceeding this limit may lead to drainage issues such as slow draining or gurgling sounds, as well as potential venting problems like airlock or inadequate venting.


It's advisable to consult local plumbing codes and regulations or seek guidance from a licensed plumber to determine the best course of action for extending the shower drain while maintaining proper drainage and venting functionality.

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