🩹 CRACK & JOINT REPAIR
Crack & Joint Repair in Ault, CO
Cracks in Ault-area concrete aren't random — they're the visible result of forces that have been acting on the slab since it was poured. Expansive Weld County soils, decades of freeze-thaw cycling, and the thermal stress of the open plains all direct stress toward the same weak points: control joints, mid-panel stress cracks, and perimeter edges where slabs meet structures. Concrete Doctor's crack and joint repair work goes beyond filling the gap — we diagnose what's driving the crack and choose the repair system that accounts for whether the movement is ongoing or finished.
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Northeastern Colorado's bentonite and clay-heavy soils create one of the most challenging subgrade environments for concrete in the state. When these soils get wet — from spring snowmelt, summer thunderstorms, or irrigation — they can expand significantly, lifting slabs unevenly. When they dry out, often rapidly under Ault's persistent summer wind and sun, they shrink and leave voids under concrete panels. That cycle of uplift and settlement is the primary driver of cracking in residential and commercial flatwork throughout this part of Weld County.
Compounding this is the freeze-thaw reality. Ault averages well over fifty freeze-thaw cycles per winter season. Every cycle that forces water into a crack and then freezes it expands that crack a small amount. Multiply that by fifty cycles per winter and ten or twenty winters, and a hairline crack becomes a structural gap. Joint sealant that has dried out, oxidized, or been pushed out by soil movement provides no protection against this process — it just creates an open channel for water and de-icer salts to enter.
Our Crack & Joint Repair Approach
Concrete Doctor categorizes cracks before deciding on the repair material, because the wrong filler in the wrong crack fails quickly in this climate. Dormant cracks — those that have stopped moving as the soil found equilibrium — are filled with a rigid or semi-rigid epoxy or cementitious material that restores load transfer across the crack plane. Active cracks, where seasonal movement is still occurring, require a flexible polyurethane filler that can accommodate the ongoing thermal and moisture-driven movement without cracking itself. Applying a rigid filler to an active crack is one of the most common reasons crack repairs fail within a season or two.
For control joints — the saw-cut or formed joints built into concrete to direct where cracking occurs — we remove deteriorated or missing joint sealant and replace it with a new flexible polyurethane joint filler. This material bonds to both sides of the joint, compresses and stretches with temperature changes, and prevents water infiltration far better than a cracked or shrunken caulk-type product. On commercial flatwork and heavily trafficked driveways, we use a semi-rigid epoxy joint filler in high-traffic areas to protect joint edges from chipping and wear while still allowing some movement. Every repair is finished flush with the surrounding surface and cleaned up so the result is structurally correct and visually clean.
Reading the Cracks: What Different Fracture Patterns Tell You About Your Slab
Not all cracks are the same, and their pattern reveals the cause. A single straight crack running across a driveway panel often reflects thermal movement or a weak point in the original pour. A crack that follows a diagonal path from a corner typically indicates differential settlement — one side of the slab has moved down relative to the other, usually because the soil support has shifted unevenly. A network of fine surface cracks in a map or mosaic pattern, sometimes called crazing, usually indicates surface shrinkage from rapid drying or poor curing conditions during the original pour. Each of these requires a different repair approach.
In Ault specifically, we see a high proportion of diagonal corner cracks and mid-panel cracks that widen toward one edge — both signatures of the uneven soil movement common in clay-heavy Weld County subgrade. When a corner crack is accompanied by a step — where one panel has settled lower than the adjacent one — it indicates that soil void formation has occurred underneath. That void, if left unfilled, allows the slab to flex under load, and flexible concrete cracks more. A complete repair addresses the crack at the surface and, where practical, stabilizes the subgrade.
We walk every customer through what we see before starting any repair work. Understanding the cause of a crack is as important as fixing it, because it tells you whether the repair is a permanent solution or whether ongoing soil movement may require future attention.
When Joint Sealant Failure Becomes a Concrete Damage Problem
Control joints in concrete flatwork are intentional weak points — they're designed to direct cracking so it happens predictably in a straight line at a sawn groove rather than randomly across a panel. But those joints only function as designed when their sealant is intact. Dried-out, cracked, or missing joint sealant in Ault conditions is an open invitation for winter damage: water enters the joint in liquid form, freezes against the concrete faces, and physically wedges the joint open wider each cycle.
Over time, this process populates joint edges — the concrete along both sides of the joint breaks down in a pattern called spalling, leaving the joint wider and rough-edged. Once joint-edge spalling begins, it accelerates because the rougher edges capture more debris and water. The repair at this stage requires routing and cleaning the joint to remove deteriorated material, sometimes grinding back the edges to expose sound concrete, and then filling with a semi-rigid or flexible joint filler appropriate for the traffic conditions.
Preventing joint-edge spalling is much cheaper than repairing it. If your driveway or commercial parking area has joints where the original sealant has dried and cracked, the right time to reseal is before the Colorado winter delivers its next round of freeze-thaw cycles — not after the edges have started to crumble.
Serving Ault, CO Since 1994
Ault's cracking patterns are familiar to us — we've seen the same clay-soil heaving, the same freeze-thaw crack widening, and the same joint deterioration across Weld County properties for years. Concrete Doctor makes the trip to Ault for crack and joint repair work because catching these issues early prevents the far larger expense of panel replacement down the road. If you're watching a crack in your driveway or garage floor and wondering whether it's getting worse, give us a call at (303) 988-2558 for a free assessment — we'll tell you exactly what's happening and what it will take to stop it.
Frequently Asked Questions
Yes — a dormant crack is still an open channel for water and de-icer salts. Even if the crack isn't growing in width, each winter cycle deposits more chemical residue inside it and risks freezing water. Filling it now costs far less than addressing the scaled and widened crack it becomes after another few winters.
Active cracks — those still moving seasonally due to thermal expansion or soil movement — need a filler that can accommodate that movement without re-cracking. A rigid epoxy filler in an active crack bonds across the gap and then breaks again when the concrete moves. Flexible polyurethane filler stretches and compresses with the movement. We test crack activity before specifying the repair material.
We can fill and seal the crack, which stops water infiltration and further deterioration. Lifting the settled panel to restore level requires a different process — mudjacking or polyurethane foam lifting — which we can discuss as part of a full assessment. In many cases, filling the crack and monitoring the settlement is the practical first step.
Properly installed polyurethane joint sealant typically performs for seven to ten years before reapplication is needed. Crack fills last as long as the underlying conditions are stable — dormant crack repairs often remain intact indefinitely, while active cracks may need attention again if soil movement continues. We give honest guidance on expected longevity for your specific situation.
We repair cracks in any concrete flatwork — driveways, sidewalks, patios, pool surrounds, garage floors, and commercial parking areas. The same principles of crack classification and material selection apply regardless of the surface type. Trip-hazard cracks in walkways are particularly important to address promptly for safety and liability reasons.
Last updated: June 2026
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