Pace Buffer Usage with The Remaining Buffer Ratio

Try to Use Buffers in Pace with the Remaining Buffer Ratio

Welcome everybody out to podcast number 1545. In this episode I’m going to talk about try to use buffers in pace with the remaining buffer ratio. If you’re interested in that, please stay with us.

I got to give credit Adam Hoots and Spencer Easton helped me create the KPIs for Takt a long time ago. The roadblock removal average and the remaining buffer ratio and the perfect handoff percentage have continued to be, I think you would say, staples in the Takt Production System. I’m very grateful to have them.

This will be a quick podcast here today, but I want to give you a suggestion that’s super important.

The Pain of Burning Through Buffers Irresponsibly

Here’s what happens when you use buffers irresponsibly. You burn through them too fast. You use multiple buffers all at once. And halfway through the phase, you have no buffers left. And now when a real delay hits, you have no protection. You’re exposed. You rush. You push. You panic. And the schedule collapses.

And there are folks that are afraid, and I’m not saying wrongly so, there are folks that are afraid of using buffers, or that trade partners will use too many buffers, or just all the typical fears. We can’t plan projects anymore nowadays unless we have buffers in the production plan.

But here’s the key: we need to have a balance. We can’t use too many all at once, but we need to use enough to where it works out, meaning we’re not rushing, pushing, panicking. And the way to track this balance is the remaining buffer ratio.

What Is the Remaining Buffer Ratio?

It hit me the other day, and I was like, “Oh my gosh, I have to share this,” that we really should be utilizing buffers in pace with the remaining buffer ratio. Let me see if I can explain the remaining buffer ratio properly here.

The remaining buffer ratio is where you take, let me see if I can get this right, you take the amount of buffers you have remaining divided by how many you still need left. That’s horrible English. There should be over one, and so you should have more than you need above what you actually have left, and that would give you a ratio of over one.

Here’s the formula:

Remaining Buffer Ratio = Buffers Remaining ÷ Buffers Still Needed

The ratio should be over 1.0. That means you have more buffers remaining than you still need. That’s healthy. If the ratio drops below 1.0, you’re burning through buffers too fast. You’re in danger.

Here’s an example:

Phase Start:

• Total buffers: 10 days
• Buffers used: 0 days
• Buffers remaining: 10 days
• Buffers still needed (to end of phase): 10 days
• Remaining buffer ratio: 10 ÷ 10 = 1.0

Midway Through Phase:

• Total buffers: 10 days
• Buffers used: 3 days
• Buffers remaining: 7 days
• Buffers still needed (to end of phase): 5 days
• Remaining buffer ratio: 7 ÷ 5 = 1.4 (healthy!)

Late in Phase (Danger Zone):

• Total buffers: 10 days
• Buffers used: 8 days
• Buffers remaining: 2 days
• Buffers still needed (to end of phase): 5 days
• Remaining buffer ratio: 2 ÷ 5 = 0.4 (danger!)

If the ratio is over 1.0, you’re healthy. If it drops below 1.0, you’re burning through buffers too fast and you need to recover differently instead of using more buffers.

How to Visualize the Remaining Buffer Ratio

Another thing that’s really neat is that we can put this into an actual visual, and in the visual show how many buffers we have remaining inside the overall system, and how many we have left, and show it as a negative or a positive percentage.

Here’s how to visualize it:

Visual Board:

• Show total buffers at the top (e.g., 10 days)
• Show buffers used (e.g., 3 days used)
• Show buffers remaining (e.g., 7 days remaining)
• Show buffers still needed to end of phase (e.g., 5 days needed)
• Show remaining buffer ratio (e.g., 7 ÷ 5 = 1.4)
• Color code: Green if ratio > 1.0, Yellow if ratio 0.8-1.0, Red if ratio < 0.8

This visual makes it easy for the team to see at a glance if they’re using buffers responsibly. If the ratio is green, keep going. If it’s yellow, be careful. If it’s red, stop using buffers and find another way to recover.

Why the Remaining Buffer Ratio Replaces CPM Metrics

This remaining buffer ratio is a really, really, really, really neat thing, and I’m in love with it. It replaces, let me make a key point here, it replaces a number of other things that CPM offers, like slippage reports, the S-curves, the critical path analysis, float trends, EVM, which are all garbage, and actually gives you something that you can use to track to the end of the phase milestone, or for the overall phase up until the overall end of the schedule as the calculated end buffer.

Here’s why remaining buffer ratio is better than CPM metrics:

Slippage reports: Show you’re behind. Don’t tell you what to do. Remaining buffer ratio shows if you have enough buffers to absorb delays and still finish on time.

S-curves: Complex and hard to read. Remaining buffer ratio is simple: over 1.0 is good, under 1.0 is bad.

Critical path analysis: Changes constantly. Hard to track. Remaining buffer ratio is stable and easy to track throughout the phase.

Float trends: Show if you’re losing float. Don’t tell you how to recover. Remaining buffer ratio shows if you can use buffers or need another recovery method.

EVM (Earned Value Management): Complex and requires lots of data. Remaining buffer ratio is simple and visual.

The remaining buffer ratio gives you something you can actually use to make decisions in real time. That’s why it’s better. If your project needs superintendent coaching, project support, or leadership development, Elevate Construction can help your field teams stabilize, schedule, and flow.

How to Use Buffers Responsibly

My point here is that if we are responsible with how many buffers we use as we go, then we don’t really have to worry about people being irresponsible with it, or rushing, pushing, or panicking.

Here’s the process:

Step One: Delay Happens

A trade is delayed. Weather hits. Material is late. Something goes wrong.

Step Two: Go to Constraints and Roadblocks Board

Discuss the delay. Identify if it’s a constraint or a roadblock. Look at recovery options.

Step Three: Evaluate Recovery Options

Can you sequence delay (swap trade order)? Can you isolate the delay? Can you re-zone? Can you use workable backlog? Try these first before using buffers.

Step Four: Check Remaining Buffer Ratio

If all options point to using a buffer, bring up the remaining buffer ratio. Is it over 1.0? If yes, you can use a buffer. If no, you need to find another way.

Step Five: Use Buffer (If Appropriate)

Use one buffer day. Update the remaining buffer ratio. Keep tracking.

Every time we discuss using a buffer, according to the delay that we’re experiencing, we go to our constraints and roadblocks board, and then we actually look and see how we might be able to recover, and if all options point to using a buffer, we just bring up the remaining buffer ratio as well, and make sure that we’re not getting ourselves in trouble.

It’s a really good way to visualize that, and I think it can be done really responsibly, and I think that it can allay everybody’s fears. I just had this realization the other day, and I think that it’s pretty brilliant.

A Challenge for Project Teams

Here’s what I want you to do this week. Calculate your remaining buffer ratio. How many buffers do you have remaining? How many do you still need to the end of the phase? Divide remaining by still needed. Is it over 1.0? If yes, you’re healthy. If no, stop using buffers and find another recovery method.

And visualize it. Put it on the board. Show the team. Green if over 1.0. Yellow if 0.8-1.0. Red if under 0.8. That creates accountability. That creates visibility. And that creates responsible buffer usage.

As we say at Elevate, use buffers in pace with remaining buffer ratio. Buffers divided by buffers still needed should be over 1.0. Visualize it, track it, use responsibly. That’s how you finish on time without burning through buffers irresponsibly. Shout out to all of these really cool KPIs, and I hope that this helps you to feel like you can utilize buffers when you need to in a more responsible way.

On we go.

Frequently Asked Questions

What is the remaining buffer ratio?

Buffers remaining divided by buffers still needed to the end of the phase. Should be over 1.0. That means you have more buffers remaining than you still need. Under 1.0 means you’re burning through buffers too fast.

Why is remaining buffer ratio better than CPM metrics?

Because it’s simple and actionable. Over 1.0 is good. Under 1.0 is bad. CPM metrics like slippage reports, S-curves, and EVM are complex and don’t tell you what to do.

How do you visualize the remaining buffer ratio?

Show total buffers, buffers used, buffers remaining, buffers still needed, and the ratio. Color code: Green if over 1.0, Yellow if 0.8-1.0, Red if under 0.8. Easy for the team to see.

When should you use a buffer instead of another recovery method?

Try sequence delay, isolated delay, re-zoning, or workable backlog first. If all options point to using a buffer AND your remaining buffer ratio is over 1.0, then use a buffer.

What happens if the remaining buffer ratio drops below 1.0?

You’re burning through buffers too fast. Stop using buffers. Find another recovery method. You’re in danger of running out of buffers before the end of the phase.