The Concrete Lifting Process Explained - North Dakota

Sunken, uneven concrete is more than an eyesore - it is a safety hazard and a liability. If you are researching the concrete lifting process explained in North Dakota, the good news is that modern concrete lifting technology can restore your surfaces for 70-90% less than full replacement. This guide covers everything North Dakota property owners need to know.

Through Global Concrete Lifting, we connect North Dakota property owners with certified concrete lifting contractors who save you 70-90% compared to full replacement - with same-day service and lifetime warranties.

Concrete lifting is a simple, proven process that raises sunken concrete slabs back to their original elevation without demolition or replacement. The concept is straightforward - drill small holes through the settled slab, inject material beneath it to fill the void, and use the pressure of the injected material to lift the slab to grade. The entire process takes 2-4 hours for most residential projects.

Two methods dominate the industry. Mudjacking (also called slabjacking or pressure grouting) pumps a cement-based slurry through 1-2 inch holes to fill the void and lift the slab. It has been used commercially since the 1930s. Polyurethane foam injection (also called polyjacking or foam lifting) pumps a two-part expanding resin through 5/8-inch holes that expands to fill voids and lift the slab. It entered commercial use in the early 2000s. Both methods achieve elevation accuracy within 1/8 inch of the target.

The process follows the same general sequence regardless of method: assessment, preparation, drilling, injection, lifting, patching, and cleanup. Over 90% of residential projects are completed in a single visit with no return trips needed. The slab is usable within minutes to hours depending on the method chosen.

Understanding how the process works - at each step - helps you evaluate contractors, set realistic expectations, and feel confident that the repair is sound. This guide walks through every phase of the process for both mudjacking and polyurethane foam injection.

Through Global Concrete Lifting, Chris Palmer connects you with experienced concrete lifting contractors in North Dakota who use proven techniques and quality materials. Call (800) 555-0213 for a free assessment.

The assessment phase is the most important step in the concrete lifting process. A thorough evaluation determines whether lifting is appropriate, which method to use, where to place injection holes, and what the project will cost.

Slab condition evaluation. The contractor inspects the entire slab surface for structural integrity. They check for cracks (noting whether they are cosmetic hairline cracks or structural through-cracks), surface deterioration (spalling, delamination, scaling), and the overall soundness of the concrete. A slab that is structurally compromised may not be a candidate for lifting - the contractor will tell you honestly if replacement is the better option.

Settlement measurement. Using a straight edge, laser level, or string line, the contractor measures the vertical displacement at multiple points across the slab. This quantifies how far each section has dropped and identifies the settlement pattern - uniform across the slab, concentrated in one area, or progressive from one side to the other. The settlement pattern helps identify the likely cause and determines the injection plan.

Void detection. The contractor taps the slab surface with a tool handle or rubber mallet, listening for hollow versus solid sounds. A hollow or drum-like sound indicates a void beneath the slab - the soil has moved away, leaving a gap. A solid sound means the slab is still in contact with soil. This mapping determines where material needs to be injected and approximately how much volume needs to be filled.

Cause identification. A good contractor identifies the probable cause of settlement - erosion, compaction, tree roots, freeze-thaw, or soil conditions - and recommends corrective measures alongside the lift. As noted in our settlement causes guide, addressing the root cause reduces re-settlement probability by 70% or more.

Method recommendation. Based on the slab condition, application, moisture exposure, and budget, the contractor recommends mudjacking or polyurethane foam injection. A contractor who offers both methods can make an unbiased recommendation. The assessment concludes with a written estimate detailing the scope, method, cost, warranty, and timeline.

Once the assessment is complete and the plan is set, the crew drills injection holes through the concrete slab at predetermined locations. This is a quick, controlled process.

Hole sizing by method. Polyurethane foam injection uses 5/8-inch holes - roughly the diameter of a penny. These small holes are one of polyurethane's advantages over mudjacking, particularly on visible surfaces like driveways, patios, and pool decks. Mudjacking uses larger holes of 1 to 2 inches in diameter to accommodate the thicker cement slurry. Both hole sizes are small relative to the slab surface area and are patched after lifting.

Hole placement strategy. Holes are positioned in a grid pattern across the affected area, typically spaced 3-6 feet apart. The spacing depends on the void depth, the method used, and how the material flows beneath the slab. Experienced operators know that material spreads differently depending on the soil type and void configuration - sandy soil allows more lateral flow, while clay soil may require tighter hole spacing. On decorative surfaces, the contractor places holes in less visible locations - along joint lines, in pattern recesses, or near edges.

The drilling process. A rotary hammer drill bores through the concrete slab in 30-60 seconds per hole. For a 4-inch residential slab, this is quick work. Thicker slabs (garage floors at 5-6 inches, commercial slabs at 6-8 inches) take slightly longer per hole. The process generates some noise (comparable to a heavy drill) and concrete dust. The crew cleans up dust as they drill and moves efficiently from hole to hole.

Number of holes. A typical residential project involves 5-15 injection holes depending on the affected area. A single sidewalk section may need 2-3 holes. A full driveway may need 10-15. Each hole adds drilling time, material, and a patched point on the surface, so efficient hole placement is part of the contractor's expertise.

What about utilities beneath the slab? Before drilling, the contractor considers the location of underground utilities - water lines, gas lines, electrical conduits, and drainage pipes. For known utility routes, holes are placed to avoid them. If utility locations are uncertain, the contractor may use ground-penetrating radar or avoid areas of concern.

The injection and lifting phase is where the actual concrete raising occurs. This is the step that requires the most operator skill and experience, and it happens quickly.

Polyurethane foam injection. The polyurethane system uses a truck-mounted proportioning unit that heats two separate chemical components (the A-side and B-side) and pumps them through heated hoses to the injection gun. At the injection point, the two components mix and immediately begin reacting - expanding 15-20 times their liquid volume within seconds. The expanding foam fills the void beneath the slab and generates enough upward force to lift the concrete. The operator injects material through one hole at a time, monitors the slab elevation with a level, and moves to the next hole as needed. The foam cures to approximately 90% strength within 15 minutes.

Mudjacking injection. The mudjacking system uses a truck-mounted mixer and hydraulic pump. The cement slurry (a mixture of water, cement, sand, and sometimes additite materials like fly ash or limestone) is mixed on-site and pumped through a hose to the injection point. Unlike polyurethane, the slurry does not expand - it fills the void at a 1:1 ratio and the hydraulic pressure of the pumped material generates the lifting force. The operator pumps slurry through each hole while monitoring the slab elevation, stopping injection when the slab reaches the target height.

Operator technique. The skill of the operator determines the quality of the result. An experienced operator reads the slab's response in real time - watching for the first signs of lift, controlling the injection rate to achieve a smooth, even rise, and stopping at precisely the right moment. Over-lifting is the biggest risk - once a slab rises above the target, it cannot be pushed back down without additional work. Experienced operators develop an instinct for how different slab sizes, thicknesses, and void configurations respond to injection.

Multi-point lifting. For large slabs or complex settlement patterns, the operator works across multiple injection holes in a specific sequence. They may partially fill through several holes, lift the slab incrementally, and then make final adjustments through selected holes to achieve a level result. This systematic approach distributes the lifting force evenly and prevents one side from rising faster than the other.

Real-time monitoring. The operator uses a level, laser, or string line to monitor elevation continuously during injection. For slabs adjacent to fixed structures (garage floors meeting foundation walls, driveways meeting sidewalks), the target elevation is defined by the adjacent surface. For isolated slabs, the target is the original grade or a specified level point.

After the slab reaches the target elevation, the finishing phase ensures a clean, professional result.

Hole patching. Each injection hole is filled with non-shrink concrete patch material. The patch is applied flush with the slab surface and smoothed. Where possible, the patch material is color-matched to the existing concrete - some contractors carry tinted patching compounds for this purpose. For polyurethane holes at 5/8 inch, the patches are small enough to be nearly invisible after a few months of weathering. For mudjacking holes at 1-2 inches, the patches are more noticeable up close but blend in from normal viewing distance.

Final elevation check. The crew runs a level or straight edge across all lifted sections, checking that the elevation meets the target within approximately 1/8 inch tolerance. They verify that transitions between lifted sections and adjacent surfaces are smooth and that no new trip hazards have been created. If any section is slightly off, minor adjustments may be made before the material fully cures (polyurethane only - mudjacking adjustments are not possible after the initial set).

Cleanup. The crew cleans up any concrete dust from drilling, excess patch material, equipment marks, and material spills. The work area should look essentially the same as before the project, minus the settled concrete. A professional crew leaves the site cleaner than they found it.

Post-project inspection. Walk the lifted area with the crew leader and confirm you are satisfied with the result. Check each section for level, verify that transitions to adjacent surfaces are smooth, and note the location of patched holes. The crew leader should explain any post-project care instructions (when the surface can be walked on, when vehicles can drive on it, any precautions during the first 24-48 hours).

What it looks like when they leave. Immediately after lifting, the patched holes are visible as fresh spots on the surface. The concrete is level. There may be slight tooling marks around the patch locations that fade over time. Within 3-6 months, the patches weather to more closely match the surrounding concrete color. The overall visual improvement from eliminating sunken, uneven sections far outweighs the minor visibility of patched holes.

Concrete lifting is a low-risk process, but understanding potential complications helps you evaluate contractors and set realistic expectations.

Over-lifting. If the operator injects too much material, the slab rises above the target elevation. Over-lifting occurs in approximately 2-5% of projects and is more common with less experienced operators. With polyurethane, once the foam cures, the slab cannot be pushed back down. The correction requires drilling adjacent sections and lifting them to match. Experienced operators mitigate this by injecting in small increments and monitoring elevation continuously. Ask contractors how they handle over-lifting - their answer reveals their experience level.

Slab cracking. If a slab is lifted too quickly or unevenly, it can crack during the process. This is more likely on thin slabs (under 3 inches), slabs with pre-existing structural cracks, or slabs with deteriorated concrete that has lost tensile strength. Experienced operators control the lift rate to minimize stress on the slab, and they identify at-risk slabs during the assessment phase. If cracking is a concern, the operator lifts in smaller increments with pauses between to distribute stress evenly.

Material migration. Both mudjacking slurry and polyurethane foam can occasionally migrate through large cracks in the slab, gaps at slab edges, or through porous soil to surface at unintended locations. With polyurethane, foam may push up through an open crack and need to be trimmed after curing. With mudjacking, slurry can flow out of slab edges if the void connects to the surface. Experienced contractors anticipate these pathways and seal major cracks before injection.

Incomplete void filling. If the void beneath the slab is connected to a larger underground void or channel (such as an eroded drainage path), injected material may flow into the void rather than building pressure under the slab. The operator may need to inject significantly more material than estimated, or in extreme cases, the void may need to be partially filled in a separate step before the lifting injection.

Choosing an experienced contractor. The risk of complications drops dramatically with operator experience. Contractors with 500+ completed projects have seen every variation and know how to respond. Through Global Concrete Lifting, Chris Palmer connects you with experienced, vetted contractors in North Dakota. Call (800) 555-0213 for a free assessment.

After the crew leaves and your concrete is level again, here is what to expect in the hours, days, and months ahead.

When you can use the surface. Polyurethane foam reaches 90% of its final compressive strength within 15 minutes. Foot traffic is safe immediately. Vehicle traffic is safe within 1 hour. Mudjacking slurry needs 24-48 hours to cure. Keep foot traffic light for the first few hours and vehicle traffic off for the full cure period. Your contractor will provide specific guidance based on the method, scope, and conditions of your project.

First 30 days. During the first month, monitor the lifted sections for any changes. A small amount of settlement (1/16 to 1/8 inch) in the first few weeks is normal as the injected material fully cures and the slab adjusts to its restored position. Settlement beyond 1/4 inch should be reported to your contractor under the warranty.

Protect your investment. Seal all joints and cracks with flexible caulk to prevent water infiltration. Address the drainage conditions that caused the original settlement (extend downspouts, improve grading, fix leaks). These steps cost little but reduce re-settlement probability by 70% or more. Sealing joints after lifting is the single most important maintenance step you can take.

Signs the repair is working. Water drains away from the slab rather than pooling on it. The transitions between sections are smooth and level. No new cracks develop. The slab holds its elevation through seasonal weather changes.

Signs that need attention. The slab settles more than 1/4 inch from the lifted position. New cracks appear that were not present before the lift. Water begins pooling in a previously dry area. Contact your contractor if any of these develop - most are covered under the project warranty.

Warranty activation. Your contractor should provide a written warranty specifying coverage duration, what triggers a warranty claim (typically re-settlement beyond 1/4 inch), and the process for filing a claim. Keep the warranty documentation with your home records. Some contractors include a complimentary 30-60 day follow-up inspection to verify the repair is holding - take advantage of this if offered.

Through Global Concrete Lifting, Chris Palmer connects you with contractors in North Dakota who stand behind their work with documented warranties. Call (800) 555-0213 for a free assessment.

Global Concrete Lifting connects North Dakota property owners with certified concrete lifting contractors who use advanced polyurethane foam technology. Every estimate is free. Here is how it works:

• Step 1: Request your free estimate - Call or submit your information online. We match you with a certified concrete lifting contractor in your area of North Dakota.
• Step 2: On-site assessment - A certified technician inspects your sunken concrete, identifies the cause, and provides a transparent estimate. Typically 70-90% less than replacement.
• Step 3: Same-day lifting - Most jobs are completed in a single day. Small holes are drilled, foam is injected beneath the slab, and your concrete is lifted back to level. Ready to use within hours.

Call Chris Palmer at (800) 555-0213 or get your free estimate online.