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What is the minimum distance a vent pipe must extend above a roof?

  1. 4 inches

  2. 6 inches

  3. 8 inches

  4. 10 inches

The correct answer is: 6 inches

The minimum distance a vent pipe must extend above a roof is specified in the plumbing code, which typically requires that the vent pipe is at least 6 inches above the roof surface. This distance is important to ensure that vent pipes function effectively without obstruction from roof structures, snow, or other debris. Extending the vent pipe above the roof helps to maintain the proper air flow, preventing sewer gases from entering living spaces. It also safeguards against back-pressure and ensures compliance with local building codes. While other distances might seem plausible, the commonly accepted standard is 6 inches due to the balance it strikes between ventilation effectiveness and practical installation requirements.