Joint Fillers & Sealants
Joints fail before floors do. Every unfilled control joint is an edge waiting for a hard wheel — MavJoint JF semi-rigid joint filler supports that edge, protects the shoulders, and seals the slab clean.
The First Place a Floor Fails
A semi-rigid joint filler is a two-component compound installed in the saw-cut control joints of a concrete slab — firm enough (Shore A 91) to support hard forklift wheels crossing the joint, with 242% elongation (ASTM D412) to tolerate the slab's normal working movement. Filled flush and shaved, it protects joint shoulders from chipping and seals out water, fines, and bacteria. Maverick's semi-rigid joint filler is MavJoint JF, offered in six standard colors.
Hard polyurethane forklift wheels concentrate enormous load on a contact patch the size of a coin. When that wheel crosses an open joint, the unsupported edge chips — and every pass makes it worse. MavJoint JF transfers that load across the joint instead of into it.
MavJoint JF is a two-component joint filler — an accessory to every Maverick floor system, not a system of its own. We honor every existing joint: each is marked, the cut is carried through the resinous system only, a backer rod is set, and MavJoint JF goes in over it and is tooled flush. Rigid enough to support wheel loads, flexible enough to tolerate normal slab movement — and every control, expansion, and isolation joint gets filled, without exception.
Why Facilities Specify MavJoint JF
- Protects joint shoulders from hard-wheel impact and progressive spalling.
- Honors every joint — marked, cut through the resinous system only, backer rod set, then filled with MavJoint JF and tooled flush.
- Seals out washdown water, fines, and bacteria in sanitary environments.
- Fast turnaround — shave in under two hours, traffic the same shift.
- Performs in freezers and ambient slabs alike — application rated down to −25 °F per TDS.
- Six standard colors to match the slab, the coating, or the brand.
MavJoint JF Joint Cross-Section
Every existing joint is honored. The slab's original saw-cut layout is marked and chalk-lined and the cut is carried through the resinous system only. A polyethylene backer rod is set in the joint, then MavJoint JF is installed over it and tooled flush with the finished floor — control, expansion and isolation joints alike. Slab saw cutting stays with the concrete contractor.
Every Component, Documented
The products that make up the system, what each one does, and where to get its technical data. Components are supplied as factory-batched kits and installed by Maverick crews per the project specification.
| Application | Product | Function in the System | Documents |
|---|---|---|---|
| Control joint filler | MavJoint JF | Semi-rigid filler protecting joint shoulders from hard-wheel traffic — part of honoring every existing joint through the installed system. | TDS (PDF) |
| Isolation / expansion joints | Elastomeric Sealant + Backer Rod | Polyethylene backer rod set in every joint; movement-rated elastomeric sealant over the rod where the slab is designed to move. | Request TDS |
| Joint edge repair | MavRapidPatch | Rapid-set rebuild of spalled joint edges before filling. | TDS (PDF) |
| Structural edge repair | MavPatch Epoxy | Epoxy mortar for deteriorated joint shoulders and spalls. | TDS (PDF) |
Six Colors. Every Slab Covered.
From bare gray concrete to pigmented MavCoat finishes, one of the six standard MavJoint JF colors will read as part of the floor. Custom colors available on volume orders.
- Black High-traffic aisles, dark slabs
- Concrete Gray Matches cured bare concrete
- Dovetail Mid-tone for sealed slabs
- Gauntlet Gray Deep gray, hides tire marking
- Intellectual Gray Warm gray for light interiors
- Warmstone Pairs with Sandstone finishes
On-screen swatches are CSS approximations. Request a physical color card for final selection — cured color varies with lighting and slab tone.
Hard Wheels, Clean Protocols
- Warehouse & Distribution
- Manufacturing
- Food & Beverage
- Cold Storage & Freezer
- Retail
- Parking Structures
Typical Properties
| Property | Test Method | Typical Value |
|---|---|---|
| Hardness | ASTM D2240, Shore A | 91 |
| Tensile strength | ASTM D412 | 1,642 psi |
| Elongation | ASTM D412 | 242% |
| Tack-free time | 72 °F / 50% RH | 12–15 minutes |
| Shave window | 72 °F | 30 minutes to 4 hours |
| Return to traffic | 72 °F | Light 1 hour; heavy 2 hours |
| Application temperature | Per TDS | Down to −25 °F (freezer applications) |
| Joint treatment | All control, expansion & isolation joints | Marked, cut through the resinous system; polyethylene backer rod set, MavJoint JF installed over it and tooled flush — control, expansion and isolation joints alike |
| Standard colors | — | 6 (see color chart) |
Common Questions
Why do control joints in a concrete floor need to be filled?
Hard polyurethane forklift wheels concentrate enormous load on a contact patch the size of a coin. When a wheel crosses an open joint, the unsupported edge chips — and every pass makes it worse. MavJoint JF semi-rigid filler transfers that load across the joint instead of into it, protecting the joint shoulders from progressive spalling.
How quickly can a filled joint take traffic?
MavJoint JF is tack-free in 12–15 minutes, shaves from 30 minutes to 4 hours, and returns to light traffic in 1 hour and heavy traffic in 2 hours — fast enough to traffic the same shift.
Can MavJoint JF be installed in freezers?
Yes. MavJoint JF performs in freezers and ambient slabs alike, with application rated down to −25 °F per the TDS.
What happens to existing joints when a Maverick floor system is installed?
Every existing joint is honored, never bridged. The slab’s original saw-cut layout is marked and chalk-lined and the cut is carried through the resinous system only. A polyethylene backer rod is then set in the joint — sized over the joint width so it compresses in, which holds the filler depth and breaks the bond at the base of the joint — and MavJoint JF is installed over it and tooled flush with the finished floor. Control, expansion and isolation joints all get this treatment. Every joint gets filled, without exception.
Complete the Joint Program
MavPatch Epoxy
Spalled joint shoulders get rebuilt square with MavPatch Epoxy before filling — the only way a filler can do its job on a damaged joint.
View in Catalog
MavPolyPatch
Quick-setting polyurea crack and spot patch filler for divots and random cracks adjacent to the joint program — repaired and trafficable the same shift.
View in Catalog
MavCoat FC
On fast-track projects, MavJoint JF's same-shift shave window keeps pace with the MavCoat FC rapid-cure basecoat's overnight coating schedule.
View in CatalogDetails & Specifications
The MAV-JT detail series covers control joint fill, expansion joint treatment, isolation joints at equipment pads, and terminations at dissimilar finishes.
Details & Drawings — Joint Systems
Joint fill and treatment details: control joint fill and overlay, expansion joints, isolation joints, and penetration seals. PDF format.
Browse the LibrarySystem Shop Drawing Library
Downloadable isometric shop drawings for 16 standard Maverick floor systems — the build-ups MavJoint JF joint treatments integrate with on a finished slab.
View Shop DrawingsCSI 3-Part Specification
Edited 3-part guide specification for concrete floor joint fillers covering MavJoint JF joint preparation, fill depth, shave requirements, and color selection.
View SpecificationsJoints Honored, Filled, and Sealed
Photographed on our projects — existing control joints filled flush through a sealed concrete floor, flat under wheels with nothing to chip, chatter, or collect debris.
Control joints filled flush through a sealed floor
How Many Linear Feet of Unfilled Joint Are in Your Floor?
Send us a slab plan or a rough joint count. We'll price a fill-and-shave program — including shoulder repair where it's needed — within 48 hours.