Forklift wheels crossing an unfilled control joint chip the concrete edges thousands of times per year. Within months, the joint becomes a spall crater. Boston Concrete installs semi-rigid polyurea filler that bonds to both edges, supports wheel load, and stops the damage cycle. Fast install, minimal downtime, free written estimate.
Concrete slabs are poured with control joints (saw cuts) to manage cracking. The joint is a weak point by design; it allows the slab to move slightly with temperature swings without cracking randomly elsewhere. But an unfilled joint is also a trap for forklift wheels. Each wheel that crosses the gap drops into the joint, applies pressure to the edge, and chips a small piece of concrete. Multiply that by hundreds of passes per day and the joint becomes a crater within a season.
Semi-rigid polyurea filler bonds to both joint edges and fills the gap completely. The material is stiff enough to support wheel load without compressing, yet flexible enough to move with the slab as temperature changes. The result is a continuous surface that wheels roll across smoothly, with no edge damage. When installed as part of a new forklift-rated epoxy system or as a retrofit on an existing floor, joint filling is the difference between a floor that lasts and one that fails.
Retrofit filling on older floors is one of the highest-ROI maintenance moves available. The work is fast, minimally disruptive, and prevents years of spall repair costs. See warehouse floor repair if joints have already failed, or explore our full warehouse concrete service menu for other options.
Recent work
Installation sequence
The Joint Filling Process in Boston
Saw and clean to depth
Each control joint is cut or cleaned to full depth using a specialty blade, removing all debris, old material, dust and contaminants so the new polyurea can bond directly to clean concrete on both sides.
Apply bonding primer
A concrete primer is applied to both joint edges where the filler will adhere, creating a permanent bond that prevents the polyurea from working loose under repeated forklift wheel impact.
Fill to full depth
Semi-rigid polyurea is injected into the joint to full depth, slightly proud of the slab surface, and allowed to cure to the manufacturer's working window before finishing.
Shave flush and finish
The cured filler is shaved flush with the slab using a specialty blade, creating a smooth, continuous surface so forklift wheels roll across the joint without any bump or transition.
Retrofit vs new install
Why Joint Filling Delivers Fast ROI
Filling control joints on an existing warehouse floor is one of the fastest payback maintenance projects available. The install itself takes one or two visits, operations can resume within hours of each zone being filled, and the prevented spall damage saves thousands in repair costs over the next few years. For a warehouse running daily forklift traffic, the math is simple: fill the joints now or repair spalls repeatedly later.
We install joint filler as a standalone retrofit on existing floors or as part of a larger floor project. Coordinate with warehouse floor coating or forklift-rated epoxy if both are planned. Zone-by-zone scheduling keeps operations moving while the concrete cures.
Semi-rigid polyurea, joint depth, retrofit vs install and forklift wheel impact.
Sealant is for weather barrier; semi-rigid filler is for load support. Joints need the filler to be hard enough to transfer wheel load across the joint without compressing, soft enough to flex slightly with slab movement. Polyurea hits that target; flexible sealants do not.
Yes, and it is one of the best investments any forklift warehouse can make. The retrofit install is fast, minimally disruptive, and prevents the next several years of joint-edge spalling for a fraction of the cost of repair.
Then warehouse floor repair on the spalled edges first, then joint filling to prevent it from happening again. We can do both in one project to address the failures and prevent recurrence.
Zone by zone over a single visit or two, with forklift traffic routed around the work zone for a few hours while each joint cures. The cure is fast (hours, not days) and operations resume in each zone as soon as cure completes.
A properly installed polyurea fill lasts the life of the slab in most warehouses. Re-fill at specific joints may be needed if a joint experiences exceptional movement, but full-floor re-fill is rarely required.
Client reviews
What Boston Operations Say About Their Joint Filling
Retrofit joint fill on our existing floor before opening a new operations zone. The spalling we had been seeing every quarter has completely stopped. Best maintenance dollar we spent.
Z. U4
Warehouse Manager, Boston
★★★★★
They explained the difference between sealant and filler clearly; the wrong material had been used before. Polyurea fill installed properly, forklift wheels roll across joints smoothly now.
Y. U4
Distribution Director, Cambridge
★★★★★
Installed during a single weekend across our entire warehouse. Operations resumed Monday morning, joints have held perfectly through two years of daily forklift traffic.
Q. U4
Logistics Operations, Somerville
★★★★★
Combined joint filling with floor coating in one project. The combined system has held with zero failures. Coordination saved scheduling time and the result is bulletproof.
X. U4
Operations Lead, Quincy
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