if mason chasing is driving you nuts be prepared! prefab everything in advance. mark floor with crayon, attach boxes with 1 1/4 tile rings with 1st 3' piece and have your nipples ready with coupling already attached. stub outs bent and ready for cut and install. another thing we did was to pre paint the interior of the boxes with a color code such as: red for fire alarm,black for dirty power white for clean power and any color for telecommunications. hope this helps
