The proper height for a washing machine P-trap depends on local plumbing codes and regulations, which can vary by region. However, I can provide some general guidelines that are commonly followed.
In the United States, the Uniform Plumbing Code (UPC) and the International Plumbing Code (IPC) provide standards for plumbing installations, including P-trap heights. According to these codes, the minimum height for a washing machine P-trap should be at least 6 inches above the floor level.
Some additional considerations to keep in mind:
Local codes may require a specific height above the floor or a certain distance from the bottom of the washing machine drain outlet to the top of the P-trap. Always check with your local building department or a licensed plumber for the specific requirements in your area.
Ensure that the P-trap is installed at a proper distance from the wall, allowing enough space for the washing machine drain hose and any necessary adjustments.
The P-trap should be installed with the correct orientation (U-shaped) to prevent sewer gas from entering the washing machine and your living space.
It's essential to have a vent after the P-trap to prevent airlock and ensure proper drainage.
Remember, adhering to local plumbing codes is crucial to ensure the safety and functionality of your plumbing system. If you're unsure about the proper installation of a washing machine P-trap, it's best to consult a licensed plumber who is familiar with your local regulations.