Float Isn't Free Time

If you think float is just free time in the schedule, that's exactly why your jobs slip.

I hear it in trailers all the time. "We're fine, we've got float." Said like it's money in the bank. It isn't. Float is not a cushion. It's not a break. And the way most jobs treat it, it's gone before anybody realizes it was ever there.

Here's what float actually is, in plain English.

Float is the amount of time an activity can slip before it causes a problem. That's it. Every activity in your schedule has some amount of room between "when it's planned" and "when it starts hurting somebody." That room is the float.

There are two kinds, and the difference matters.

Total float is how much an activity can slip before it delays the end of the project. That's the big number. When somebody says "we've got ten days of float," they usually mean total float. Ten days before the project itself moves.

Free float is how much an activity can slip before it delays the next activity behind it. The successor. This is the smaller number, and it's the one that actually runs your week. You can have ten days of total float and zero days of free float, which means the moment you slip, you're stepping on the crew behind you, even though the project end date hasn't moved yet.

Most field guys only ever hear the total. That's how you end up burning your successor's week and wondering why the next foreman is mad at you.

Now here's the part nobody explains: float is shared.

Float doesn't belong to an activity. It belongs to a path, a whole chain of activities. Every activity on that chain draws from the same pool. Picture a chain of three activities with ten days of float on the path. The first activity slips four days waiting on material. Now the path has six. The second activity loses three to rework. Now it has three. The third activity did nothing wrong, but it's now working with three days of room instead of ten, and one bad week wipes it out.

Nobody stole anything. That's just how shared float works. Whoever uses it first usually isn't the one who needed it most. The early trades burn it on slow starts and late material, and the finishers at the end of the chain inherit an empty tank.

So float burns, it's shared, and it disappears from the front of the line backward. Treat it like free time and you'll spend it before you ever needed it.

Here's what to do instead. The next time somebody in the trailer says "we've got float," ask three questions.

Whose float? Float lives on a path, not an activity. Find out which chain of work that float belongs to and who's drawing from it.

On what path? Is it the path that drives your scope, or somebody else's? Float on a path you don't control doesn't help you.

What's eating it this week? Float gets consumed by real things: late deliveries, slow starts, rework, weather. Ask what's burning it right now, because whatever it is, it's still burning.

Those three questions turn "we've got float" from a feeling into a fact. And facts are what keep you out of trouble.

One more thing. Go look at your own schedule this week. Find the float column. Look at the activities tied to your scope and read the numbers, total and free. If you can't find the column, ask your scheduler to show you. That's a five-minute conversation that will change how you read the whole job.

Float isn't free time. It's borrowed time, shared with everybody on your path. Spend it like you understand that, and you'll stop being surprised when it's gone.

That's the whole lesson, and it's free. If you want it concentrated, that's what The Plan Room is for: the lessons in order, feedback on your own schedule, and a room full of people working through it alongside you. Free group on LinkedIn: https://www.linkedin.com/groups/40982025/