In Primavera P6 On 1 activity Total Float = 0, but Free Float = 8 days. Is this possible? In the picture below you see that the sucessor of wiring devices is the Finish Milestone, so it has a Total Float of 8. However its predecessor the roughing-ins has zero free float because in the schedule wiring devices start immediately next day after roughing-ins is finished.
What’s the difference between Free Float and Total Float in Primavera P6? Free Float is counted related to its sucessor only. while Total Float is counted up to the end date. If the sucessor of the activity also have a Free Float, the float of the next activity plus its own free float is its Total Float. That’s why it Free Float is greater than its Total Float. If its successor is in the critical path, Free Float is equal to Total Float.