Filled control joints for forklift floors
Every sawcut joint in your slab is a little trench, and forklift wheels hit its far edge thousands of times. We fill them with a semi-rigid filler so the wheels roll across instead of dropping in.
What goes in it
- Joint cleaned out to the full sawcut depth, old caulk and debris removed
- Vacuumed, dry joint walls so the filler bonds to both sides
- Semi-rigid polyurea or epoxy joint filler, poured slightly overfilled
- Filler shaved flush with the floor once it sets
- Coating or polish carried over or around the filled joints
We won’t fill joints with soft caulk on a forklift floor, because it looks finished for a week and then does nothing to stop the edges from chipping.
What it is
Repair floors. All repair services
Commercial floor joint filling is the routine fix for sawcut control joints in warehouses, shops, distribution buildings and any slab that sees hard wheels. Those joints are cut into new concrete on purpose, so the slab cracks along straight lines as it shrinks. Left open, they collect dirt and debris, and every forklift or pallet jack wheel drops into the gap and smacks the far edge. Over time that hit chips the edges, the joint widens, and the bump gets worse for the drivers, the equipment and whatever is riding on the forks.
Joint filling assumes the edges are still sound.
The fix is a semi-rigid filler, usually a polyurea or an epoxy made for this exact job. It’s hard enough to carry a wheel across the joint but has a little give, so it moves with the slab instead of cracking. We clean each joint out to full depth with a saw or a joint-cleaning blade, vacuum it dry, fill it slightly proud, and shave it flush once it sets. Polyurea cures fast, so a lane can often go back to work the same day. Soft caulk is the wrong product here. It looks filled, then folds under a wheel and gives the edges no support at all.
If they’re chipped, crumbled or broken off, that’s concrete joint repair, which rebuilds the edges before anything gets filled, and it has its own page. Timing matters too. A slab keeps shrinking for months after it’s poured, so joints filled early can pull away from the sides, and even an older floor can open a hairline gap now and then. That’s normal, and topping off the filler later is a quick job.
Where it belongs
Forklift aisles
The joints that carry the most wheel hits, and the first ones to chip if they’re left open.
Warehouses before coating
Joints get filled as part of the prep, so the new coating isn’t trying to bridge an open gap.
Polished concrete floors
Filled joints keep grit and grime out of the gaps and make the whole floor look finished.
Shops with carts and jacks
Small hard wheels catch open joints badly, and filling them makes rolling smoother and quieter.
How we install it
- 1
Check the joints
We walk the slab and sort joints into sound ones to fill and broken ones that need repair first.
- 2
Clean them out
Each joint gets sawed or routed clean to full depth, then vacuumed dry.
- 3
Pick the filler
Polyurea where you need the lane back fast, epoxy where cure time isn’t an issue, in gray or a matched color.
- 4
Fill and shave
We overfill slightly, let it set, then razor it flush with the slab so wheels roll right over.
- 5
Open the lane
Forklifts come back on the filler’s cure time, often within hours with polyurea.
Built for desert conditions
Heat, sun, wind and sand, as they hit this kind of floor.
Ask about your floorSlabs in the Antelope Valley go through big swings between a cold night and a hot afternoon, and a slab inside a metal building feels most of it. Concrete grows and shrinks with temperature, so control joints open and close a little every single day. That’s why a semi-rigid filler is the right call out here: it can follow small movement without cracking down the middle.
Open joints in a desert building also fill with sand fast. Wind pushes grit across the floor, it settles into every gap, and once it packs down it breaks the joint edges from the inside every time a wheel rolls over. Filling the joints closes that off, and it makes sweeping a big floor a lot easier. It also stops the dust from puffing back out of the joints every time a forklift rolls past an open door.
Living with it
Sweep regularly so sand doesn’t pile up along the joint lines. Watch for filler that has separated from one side or worn low in the busiest lanes, and get it topped off before wheels start chipping the edges. Don’t scrape filled joints with forks or floor scrapers. Avoid aiming a pressure washer straight into a joint.
Related services
Concrete Floor Leveling
Cement-based self-leveling underlayment poured over dips and low spots, so epoxy, tile or plank goes down on a flat slab.
Concrete Floor Flattening
Diamond grinding of high spots and curled joints until a slab meets the flatness spec your racking and forklifts need.
Concrete Joint Repair
Spalled and broken joint edges cut back, rebuilt with epoxy or polyurea mortar and recut, so forklifts cross without the thump.
Concrete Spall Repair
Popped, flaking concrete cut back to sound material and rebuilt with epoxy or patch mortar, ground flush and ready for coating.
From Palmdale we cover the Antelope Valley and beyond, including Desert View Highlands, Quartz Hill, Acton, Lancaster. See finished floors in the gallery.
Questions about commercial floor joint filling
Can’t we use caulk in the joints?
Caulk is soft. Under a forklift wheel it squishes down and gives the joint edges no support, so they chip anyway. Semi-rigid filler is hard enough to carry the wheel across the gap.
How soon can forklifts drive over filled joints?
With polyurea, often within an hour or two. Epoxy fillers take longer, usually overnight. We match the product to how much downtime you can live with.
Our filler is pulling away from the sides. Did it fail?
Usually not. Slabs keep shrinking, especially in their first year, and a thin gap can open between the filler and the concrete. Topping it off with fresh filler takes care of it, and it’s a normal follow-up on newer floors.
Should joints be filled before or after a coating goes down?
It depends on the system and how much the slab still moves. On many coated floors we fill first and coat over the joints, and on others we keep the joint line open through the coating and fill it afterward. We pick the approach after checking the slab’s age and movement.
What if our joint edges are already broken?
Then filling alone won’t hold, because there’s no solid edge for the filler to bond to. Those joints need concrete joint repair first, which rebuilds the edges. We often do both on one visit, repairing where needed and filling the rest.
Can the filler match the color of our floor?
Joint fillers come in gray and a range of other colors, and some can be tinted. On polished or coated floors we either match closely or pick a deliberate contrast line. Plain gray works for most warehouses.
Planning a new
floor?
Send a few photos of the floor and the room. we will tell you whether commercial floor joint filling is the right system for it.
What to send and what happens next. Want proof first? See the floors.