I know the trap should be 6-8 inches from the floor and the stand pipe should be between 18 and 30 inches. I'm helping my sister remodel her laundry room and the drain appears to be installed incorrectly. The trap is too high and the stand pipe is too short all with 1 1/2" abs. It was working fine with her old washer but now she is installing a HE frontloader. The wall is cinderbloack,on a concrete slab, and the drain coming out of the wall is approx 24 up from the floor. Can I turn 90 down and put the trap in the correct location and also lengthen the stand pipe at the same time or do I need to lower the drain in the wall?