|
Lean construction is all about identifying and eliminating waste in processes. Learn the acronym DOWNTIME to remember the 8 types of waste in construction. See how visual planning methods can help you address or prevent each form of waste. |
In construction, downtime usually refers to a machine sitting idle or a site shut down due to weather. But in the context of Lean construction, DOWNTIME takes on a different meaning. It’s an acronym used to identify the eight types of waste that stall productivity, inflate budgets and erode profit margins.
| D | Defects |
| O | Overproduction |
| W | Waiting |
| N | Non-use of talent |
| T | Transportation |
| I | Inventory |
| M | Motion |
| E | Extra processing |
Lean construction has a simple goal: Find ways to deliver benefits that customers are willing to pay for (value) and remove things from your processes that impede you from doing so (waste).
But to eliminate waste, you first must know where to uncover it. The acronym DOWNTIME helps break down each type of waste in a memorable way. In this blog, we identify the waste categories and reveal how visual planning can help you eliminate them.
Defects are the most visible form of waste. In construction, this means rework. Whether it’s a wall framed in the wrong location or a pipe installed at the wrong pitch, defects require additional time, materials and labor to fix.
How visual planning helps: Using a visual planning tool like Nialli™ Visual Planner means teams have access to the most up-to-date information in real time. When everyone is looking at the same single source of truth, the risk of working from outdated drawings or misinterpreting a plan drops significantly, reducing the likelihood of defects.
Overproduction occurs when a task is completed before it is needed or when more product is created than the next person in the process can handle. While it might feel good to be ahead of schedule, overproduction can result in a cluttered jobsite that requires other trades to work around completed sections that weren’t supposed to be there yet.
How visual planning helps: Lean is about pull, not push. By working backward from the end goal using a process known as pull planning, teams stay better aligned by ensuring tasks are not started until the next trade in the sequence is ready to begin their work.
Waiting is the silent killer of construction productivity. This is the time lost while workers wait for materials, equipment, information (RFIs) or the previous trade to finish their work.
How visual planning helps: A visual schedule makes it clear to everyone on the jobsite who is supposed to be where in the coming weeks. Multiple sets of eyes on the plan allows for bottlenecks to be identified before work grinds to a halt. And if a roadblock can’t be avoided, the process of proactively looking ahead and mapping dependencies between tasks means the impacted trades can be redeployed in advance to other projects or tasks, rather than sitting idle at the jobsite waiting for updates.
Non-use of talent occurs when we fail to leverage the skills, experience, and expertise of everyone involved in a construction project. Sometimes, projects proceed without the input of the senior forepersons and trade partners on the ground, who often have great insights into solving jobsite-level problems, defaulting instead to what’s written in the contractual schedule.
How visual planning helps: Rather than relying solely on a master schedule created long before the project commenced, visual planning gets trades directly involved in forming the short-term, production-focused schedule of the jobsite. Trades provide direct input on the tasks within the current phase of work, adjusting the sequence as necessary based on their expertise in the field and direct involvement in the project. Digital tools take this a step further, capturing data from every step of the process to provide preconstruction and scheduling teams with more accurate estimates for future bids or phases of work.
Transportation waste is the unnecessary movement of materials, tools or equipment. Every time a pallet of drywall is moved from one side of the floor to the other without being installed, you are wasting time and increasing the risk of damage to materials.
How visual planning helps: Visual planning divides work into clear zones, helping teams ensure materials get delivered as close as possible to the point of installation. Visual plans also help crews know exactly what they are supposed to be working on and where in advance, ensuring they show up with the right materials and equipment.
Inventory in excessive quantities is considered frozen capital in Lean construction. Whether it’s piles of lumber sitting outside or stacks of fixtures taking up space, excess inventory creates clutter, requires extra handling (transportation waste) and risks being damaged or stolen.
How visual planning helps: Creating a look-ahead schedule and sharing this plan with your supply chain ensures that deliveries are coordinated to arrive exactly when they are supposed to and in the correct quantities, keeping the jobsite clear and reducing costs associated with storage or wasted supplies.
Motion refers to the unnecessary movement of people. If a carpenter has to walk across a massive jobsite five times a day to find a foreperson or check a set of paper plans, that is wasted motion.
How visual planning helps: Everyone has a clear plan of where they are supposed to be working in advance, reducing unnecessary supply runs or trips taken across the jobsite to ask for updates. Using a digital platform means even fewer trips are necessary, as crews can immediately access the most up-to-date plan from their mobile or tablet device, rather than having to view the plan in the site office.
Extra processing is doing more work than is required by the customer or the specifications. This could be double entry of data into multiple software systems or requiring three signatures for a simple change when one would suffice.
How visual planning helps: This is where digital tools really shine. Rather than having to piece together spreadsheets for reporting or shuffle an entire wall of Post-it® Notes, digital platforms make it easy to capture progress reporting, line up tasks ahead of meetings, jump to different areas of the plan and share live updates with everyone.
Waste isn't an inevitable part of construction — it can be managed and controlled. The DOWNTIME framework makes it easy to identify areas for improvement. Using a visual planning process can help you address many areas of concern, transforming jobsites from chaotic environments into streamlined, value-driven operations.
Ready to tackle DOWNTIME? See how Nialli is aligning trades and keeping projects on track with hands-on, visual construction planning.