Ideal Washing Machine Drain Standpipe Height
A washing machine drain standpipe should be 18 to 42 inches (457–1,067 mm) above the trap weir, with the trap itself positioned 6 to 18 inches above the finished floor. In practical terms, most installations aim for a standpipe top between 30 and 48 inches from the floor, which balances code compliance with manufacturer specifications. Why Standpipe Height Matters