Floor Leveling
Professional floor leveling by Carpet Services Incorporated (CSI). Self-leveling compound, concrete grinding, and uneven floor repair for Chicagoland homes and businesses since 1979.
Floor Leveling That Protects Your Investment
An uneven floor is more than a nuisance — it is a threat to every flooring product installed above it. Luxury vinyl planks separate, tiles crack, hardwood cups, and carpet wears unevenly when the substrate beneath is out of flat. Carpet Services Incorporated (CSI) provides professional floor leveling for residential and commercial properties throughout the Chicagoland area, ensuring your new flooring performs exactly as the manufacturer intended.
Chicagoland homes and buildings face unique challenges that contribute to floor unevenness. Expansive clay soils common in DuPage, Cook, Kane, and Will counties shift with seasonal moisture changes, causing foundations to settle unevenly. Freeze-thaw cycles heave concrete slabs, and older homes in communities like Berwyn, Oak Park, and Cicero often have wood subfloors that have warped or sagged over decades of use.
CSI approaches every flooring installation and repair project with a level-first mentality. We measure your substrate during the free estimate, identify problem areas, and prescribe the right leveling method before any new flooring goes down. It is the step most companies skip — and the one that determines whether your floor lasts five years or fifty.
Floor Leveling Techniques for Every Situation
There is no one-size-fits-all approach to floor leveling. The correct method depends on the subfloor material, the severity and type of unevenness, and the flooring product going on top. CSI uses professional-grade materials and proven techniques tailored to each project's specific conditions.
Self-Leveling Compound
Self-leveling compound is a pourable cementitious or gypsum-based material that flows across the floor under gravity, filling low spots and creating a flat, smooth surface. CSI uses professional-grade compounds that achieve manufacturer-required flatness tolerances — typically within 1/8 inch over 6 feet for luxury vinyl and tile. This method is ideal for luxury vinyl and floating floor installations where an ultra-flat substrate is essential.
Concrete Floor Grinding
When a concrete slab has high spots, ridges from poor finishing, or lippage at joints, grinding is the most efficient solution. CSI uses walk-behind planetary grinders with diamond tooling that shave down raised areas to match the surrounding plane. Concrete floor leveling through grinding produces minimal dust with our vacuum-equipped equipment and leaves a surface ready for thin-set tile, epoxy, or adhesive applications.
Wood Subfloor Shimming
Homes with plywood or OSB subfloors often develop sags between joists, particularly in older Chicagoland properties. CSI addresses these low areas with asphalt shingles, roofing felt, or custom-cut shims that build up the surface incrementally until the floor is flat. This method preserves the existing subfloor and avoids the cost and mess of full replacement.
Patch and Skim Coats
Minor irregularities — small depressions, divots, fastener holes, and minor height differences at plywood seams — are addressed with patching compound and skim coats. CSI uses fast-setting polymer-modified patching materials that bond permanently to concrete or wood substrates and can be featheredged to zero for an invisible transition. This is the most common uneven floor repair we perform.
Moisture Barrier Coatings
In the Chicagoland area, basement and ground-level concrete slabs frequently transmit moisture vapor that can undermine leveling compounds and flooring adhesives. CSI applies moisture mitigation coatings before leveling when testing reveals elevated vapor emission rates. This step is critical for moisture-sensitive installations and prevents costly failures down the road.
Complete Subfloor Renewal
When the existing subfloor is severely deteriorated — rotted, delaminated, or structurally compromised — partial repairs and leveling compounds cannot provide a reliable foundation. CSI removes the damaged material and installs new plywood or oriented strand board to current building codes, then levels the new surface to the flatness tolerance your flooring requires. Full subfloor preparation ensures the structural integrity your project demands.
From Inspection to Level Surface
Every successful floor leveling project follows a disciplined process. CSI has refined this workflow over 45 years of Chicagoland installations, ensuring each step is completed correctly before the next begins.
Free On-Site Assessment
A CSI estimator visits your property to measure the floor with a 10-foot straightedge and digital level, identifying every area that falls outside flatness tolerance. We document the subfloor type, moisture conditions, and the flooring product you plan to install, then provide a written estimate on the spot.
Surface Prep and Repair
Before any leveling material is applied, the crew cleans the subfloor of all debris, adhesive residue, paint, and loose material. Cracks are chased and filled, and any necessary repairs to the substrate are completed. If moisture testing indicates elevated vapor levels, a moisture barrier coating is applied at this stage.
Leveling Application
Depending on the method prescribed, the crew applies self-leveling compound, grinds high spots, or installs shims and patches. Self-leveling pours are typically completed in a single day and flow to a flat surface within minutes. Grinding projects vary by square footage but most residential jobs are finished within one working day.
Cure Time & Verification
Self-leveling compound requires 4 to 6 hours before foot traffic and 24 hours before full curing, depending on product thickness. After the cure period, CSI re-measures the floor with a straightedge to verify that every area meets the required flatness tolerance. Only then is the surface approved for new flooring installation.
New Floor Installation
With a verified level substrate, your new flooring is installed on a surface that meets or exceeds manufacturer specifications. This step is completed by CSI's in-house installation crews, ensuring a seamless handoff from leveling to finished floor without the coordination gaps that occur when multiple contractors are involved.
The CSI Difference in Floor Leveling
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Measure First, Level Second CSI measures every floor with professional straightedges and digital levels before recommending a leveling approach. We never guess at the severity or skip the assessment — precision measurement drives every decision.
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Manufacturer-Grade Materials We use commercial-grade self-leveling compounds, polymer-modified patches, and moisture barriers that meet or exceed flooring manufacturer requirements. Substandard materials are never an option, regardless of project budget.
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Leveling + Installation Under One Roof Unlike companies that only level or only install, CSI handles both phases with in-house crews. This eliminates the finger-pointing that occurs when a leveling contractor and an installation contractor disagree over substrate readiness.
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Moisture Testing Included Every CSI leveling assessment includes calcium chloride or relative humidity moisture testing on concrete slabs at no additional charge. Hidden moisture is the leading cause of flooring failure, and we will not let it go undetected on our watch.
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45 Years of Chicagoland Experience Since 1979, CSI has leveled floors in homes, offices, retail spaces, and multi-unit buildings across DuPage, Cook, Kane, and Will counties. We understand the local soil conditions, construction methods, and building codes that affect subfloor performance.
What Our Clients Say About Floor Leveling
"We had no idea our basement floor was so uneven until CSI measured it. They showed us the low spots with a laser level, applied self-leveling compound the next day, and our new vinyl plank went down perfectly. No hollow spots, no creaking — just a solid, flat floor."
"Our commercial space had a concrete slab with serious ridges from the original pour. CSI ground down the high spots and skim-coated the lows before installing tile. The floor is perfectly flat now and the tile setter said it was one of the best-prepped substrates he has worked on."
"After three other contractors told us our floors were too wavy for luxury vinyl, CSI came in, leveled the entire first floor with self-leveling compound, and installed our vinyl in under a week. They solved a problem everyone else walked away from."
Related Services & Resources
Preparation Services
Floor Install Options
Repair Services
Resources
Floor Leveling FAQ
Floor leveling costs vary based on the severity of the unevenness, the square footage, and the method required. Self-leveling compound typically ranges from moderate to high per square foot depending on product thickness, while concrete grinding is priced by the hour and area size. Carpet Services Incorporated (CSI) provides free on-site estimates so you receive an accurate, itemized quote with no surprises. Call (708) 222-8200 to schedule your assessment.
Uneven floors can result from several factors including settling foundations, moisture damage to the subfloor, deteriorated joists, improper original construction, or cracked concrete slabs. In the Chicagoland area, freeze-thaw cycles and expansive clay soils are common contributors to foundation movement that leads to floor irregularities. CSI inspects every floor to identify the root cause before recommending a leveling solution.
Most self-leveling compounds are walkable within 4 to 6 hours and fully cured within 24 hours, though cure times vary by product and pour thickness. CSI uses professional-grade compounds that accelerate drying without sacrificing strength, allowing new flooring installation to begin the next day in most cases. Your estimator will provide a specific timeline based on the products selected for your project.
In some cases, yes. If the existing flooring is firmly bonded, structurally sound, and flat enough to accept a leveling compound, CSI may be able to apply the compound directly over it. However, most projects require removing the old flooring first to properly assess and address the subfloor condition. Your CSI estimator will evaluate whether removal is necessary during the free on-site assessment.
Floor leveling is strongly recommended before most new flooring installations. Luxury vinyl plank, laminate, and tile all require a flat substrate within manufacturer tolerances to prevent cracking, buckling, or void warranties. Carpet is more forgiving of minor irregularities but still benefits from a level surface for even wear and proper stretch. CSI measures every floor during the estimate to determine whether leveling is needed.
Self-leveling compound is a cementitious or gypsum-based pourable material that flows across the floor and fills low spots to create a flat surface. Concrete grinding uses specialized equipment to shave down high spots and ridges in concrete slabs. CSI selects the method, or a combination of both, based on whether your floor has low areas that need filling, high areas that need shaving, or both. The right approach depends entirely on the conditions found during inspection.
Uneven Floors? We Level Them.
Whether your subfloor needs self-leveling compound, concrete grinding, or a full repair, Carpet Services Incorporated has the tools, the crew, and 45 years of experience to get your floor flat and ready for new flooring.