When the concrete under your feet in Uniondale has been through 60 Long Island winters, it shows. Slabs in Uniondale’s post-WWII housing stock most of it built on the former Mitchel Field site through the 1950s and 1960s were poured before modern moisture barriers and reinforcement were standard. Decades of freeze-thaw cycling have left a lot of those floors cracked, settled, and uneven in ways that no amount of patching will permanently fix.
Self leveling underlayment addresses the actual problem. A properly prepared, polymer-modified cementitious pour bonds to the existing substrate, fills low spots, corrects elevation changes, and gives the next floor covering tile, vinyl plank, hardwood, epoxy a stable, flat surface that won’t shift or crack underneath it. That means no more tiles popping up six months after installation. No more luxury vinyl planks buckling at the seams.
For commercial spaces along Hempstead Turnpike in Uniondale, the timeline matters just as much as the result. Our self leveling systems are walkable within two hours and ready for most floor coverings within 12 hours. If your business can’t afford a multi-day closure, that turnaround changes everything about how you plan a renovation.
We’re based in Bohemia, NY a Long Island contractor, not a regional chain calling in from out of state. Danny Harmer, our president and CEO, has over 40 years of hands-on installation experience, and the crew that works alongside him has mostly been with us for more than a decade. That kind of continuity matters when the work requires real diagnostic judgment, not just someone following a bag’s directions.
We’ve been in business for over 30 years, hold an A+ BBB accreditation, and have completed projects across the country and internationally including a 1996 installation in the White House kitchen. That track record isn’t mentioned to impress. It’s mentioned because if you’re a homeowner in Uniondale with a $550,000 asset or a facilities manager at one of the institutional properties near the Nassau Hub, you deserve to know who’s actually showing up.
Every job is handled in-house moisture testing, surface prep, concrete repair, the self leveling pour, and the final floor system if needed. No handoffs between subcontractors, no gaps in accountability.
The first thing we do is test for moisture. In Nassau County’s humid subtropical climate with Long Island’s elevated water tables and coastal air moisture vapor emission from concrete slabs is one of the most common reasons self leveling jobs fail. ASTM F2170 requires relative humidity in the slab to be below 80% before any underlayment goes down. We test before we pour, every time. Skipping that step in this climate is how you end up with a delaminated floor in 18 months.
Once moisture levels are confirmed, the surface gets ground and cleaned to ensure proper bonding. Any cracks or structural damage in the slab are repaired before the pour not after. The self leveling material we use is a high strength, cement-based, polymer-modified system with high flow characteristics. It can be installed from a quarter inch to over two inches neat, and up to five inches with aggregate added. That range covers everything from a minor skim coat before tile to a significant correction on a heavily settled commercial floor.
Permits for interior flooring work in Uniondale run through the Town of Hempstead Building Department. If your project requires one, we know the process. After the pour, foot traffic is typically safe within two hours, and most floor coverings can go down within 12 hours a timeline that matters whether you’re a homeowner finishing a renovation or a business on the Turnpike trying to reopen quickly.
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Our self leveling underlayment service works across interior concrete, plywood, and other approved substrates. The system handles light residential corrections and heavy commercial applications equally well from a thin skim coat before luxury vinyl installation in a Uniondale South home to a multi-inch correction on a commercial floor in one of the office or retail spaces surrounding RXR Plaza or the Nassau Hub development.
For the institutional and commercial work that defines a lot of Uniondale’s renovation pipeline university facilities at Hofstra, healthcare or biotech spaces, hospitality projects floor flatness is a specification requirement, not a preference. Biotech and life sciences environments in particular demand seamless, flat surfaces before any final floor system goes down. Our crew is OSHA 40-certified, which is a standard procurement requirement for work in those kinds of facilities. You won’t need to chase down safety documentation after the fact.
On the residential side, the self leveling underlayment material we use is not the consumer-grade compound available at a home improvement store. It’s a professional polymer-modified system that flows to level under its own weight, bonds properly to aged concrete, and cures with low shrinkage meaning it won’t pull away from the edges or crack as it dries. For Uniondale homeowners investing in a floor that’s meant to last, that distinction is worth understanding before anyone starts mixing material.
The most obvious signs are visible tiles cracking along grout lines, vinyl planks that won’t stay flat, doors dragging against the floor, or gaps opening up between the baseboard and the flooring. But some unevenness isn’t visible until you put a long level on the floor and see how much it moves. In Uniondale’s older housing stock, where many slabs were poured in the 1950s and 1960s without the reinforcement standards used today, settlement and surface irregularity are extremely common. It’s not a sign that something is catastrophically wrong it’s just what happens to concrete over 60 or 70 years.
The real question is whether the unevenness is a surface issue or a structural one. Surface irregularity low spots, high spots, minor cracking is exactly what self leveling underlayment is designed to correct. If there’s active settlement, a heaving slab, or a drainage issue underneath, that needs to be diagnosed first. A professional assessment before any material gets poured is the right starting point, not a guess based on what the floor looks like from above.
Moisture vapor moves upward through concrete constantly, even in slabs that look and feel completely dry. When self leveling underlayment is installed over a slab with excessive moisture vapor emission, the bond between the underlayment and the concrete weakens over time. Eventually, the material delaminates it lifts, cracks, or separates from the substrate. Whatever floor covering was installed on top of it fails along with it.
On Long Island, this is a real and recurring problem. Uniondale’s climate high humidity in summer, fluctuating temperatures in winter, and water tables that run relatively shallow in many areas means moisture vapor emission is not a hypothetical risk. It’s a baseline condition that has to be measured and managed before any pour. The ASTM F2170 standard sets the threshold at 80% relative humidity in the slab. We test to that standard before every installation. If the slab is above threshold, we address it before the self leveling material goes down not after the floor covering starts failing six months later.
It depends entirely on the depth of the correction needed. For a minor surface irregularity a low spot or a slightly uneven section before installing luxury vinyl plank a quarter-inch application may be all that’s required. For more significant settlement, like what’s common in Uniondale homes built on the former Mitchel Field site where soil conditions and decades of freeze-thaw cycling have caused more substantial movement, corrections of an inch or more are not unusual.
Our system can be installed from a quarter inch to over two inches neat, and up to five inches with the addition of aggregates. That range means one contractor can handle the full spectrum of what a Uniondale floor might need you don’t have to find a different company based on how severe the problem turns out to be. The depth is determined after a proper assessment of the slab, not estimated from a phone call. Getting that measurement right before the pour is what keeps the job from having to be redone.
Fast curing self leveling systems are formulated to reach foot traffic strength within a couple of hours and floor-covering readiness within 12 to 24 hours, depending on the product and the application depth. Standard cementitious products can require 24 to 72 hours or more before the next phase of work can begin. For a homeowner in the middle of a renovation, that difference might mean finishing on schedule. For a commercial tenant on Hempstead Turnpike who needs to reopen, it can be the difference between a one-day closure and a three-day closure.
The fast curing concrete leveler systems we use don’t sacrifice strength for speed. The polymer modification in the material is what allows it to cure quickly without the shrinkage cracking that cheaper fast-set products sometimes produce. Cure time is also affected by ambient temperature and humidity both of which vary significantly in Nassau County across seasons. In winter, unheated commercial spaces can slow cure times considerably, which is something we account for during scheduling and installation planning.
Yes, and it’s one of the most common applications. Retail spaces, restaurants, medical offices, and institutional facilities all use self leveling underlayment commercial systems to prepare concrete subfloors before tile, vinyl, or resinous coating systems are installed. In Uniondale specifically, the volume of commercial and institutional renovation activity driven by properties near RXR Plaza, the Nassau Hub development, and the university and college campuses means this is not a niche application. It’s a standard part of how commercial floors get prepared in this area.
For healthcare and biotech facilities, which are a growing part of what’s being built and renovated in the Nassau Hub corridor, floor flatness tolerances are written into specifications. A self leveling pour that’s done correctly with proper moisture testing, surface preparation, and the right product for the application is what makes those tolerances achievable. Our crew is OSHA 40-certified, which is a standard requirement for work in institutional and commercial environments. That certification is already in place it doesn’t need to be arranged after you’ve already committed to a contractor.
The honest answer is that it depends on the square footage, the depth of correction needed, the condition of the existing slab, and whether moisture mitigation is required before the pour. Nationally, concrete leveling projects typically range from around $750 on the low end to $6,000 or more for larger or more complex jobs. In Nassau County, where the cost of living index runs well above the national average, labor and material costs reflect that reality you’re not going to find Long Island pricing that matches what someone in a lower-cost market pays.
What drives cost more than anything else is the depth of correction and the condition of the substrate. A thin skim coat over a relatively sound slab in a Uniondale home is a straightforward job. A multi-inch correction on a commercial floor with moisture issues and surface damage is a different scope entirely. The way to get an accurate number is to have the slab assessed in person not estimated over the phone based on square footage alone. We’d rather give you a real number after seeing the floor than a low estimate that changes once work begins.
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