What is the primary purpose of branch intervals in plumbing design?

The primary purpose of branch intervals in plumbing design is to connect horizontal branches to a stack. This function is essential for ensuring proper drainage and ventilation within the plumbing system. When horizontal branch lines are installed, they must be adequately tied into the vertical stack, which manages both waste flow and air circulation. This connection facilitates the efficient movement of waste and helps prevent pressure imbalances that can lead to issues such as siphoning or backflow.

Properly designed branch intervals also contribute to the overall organization and function of the plumbing layout, ensuring that each branch effectively communicates with the main waste stack. This is critical for maintaining the integrity of the plumbing system and preventing clogs or blockages. Connecting horizontal branches in this manner aligns with best practices as outlined in plumbing codes, providing a streamlined route for waste to flow toward the main drain and ultimately to the sewer system.