What is the minimum required depth for a P-trap seal?

The minimum required depth for a P-trap seal is 2 inches. This depth is essential to ensure that there is a sufficient water barrier to prevent sewer gases from escaping into the living space. A P-trap functions by retaining a specific volume of water, thus forming a seal. The 2-inch seal ensures that even if the trap experiences minor fluctuations in water level due to factors such as evaporation or small leaks, there is still enough water in the trap to maintain the seal effectively. This depth is consistent with plumbing codes and standards, which are designed to safeguard health and safety by preventing the ingress of harmful sewer gases. Understanding this requirement is crucial for anyone working with plumbing systems, as it directly affects the performance and safety of drainage systems.