Leveling With You: How Subfloor Imperfections Ruin Expensive Commercial Vinyl Plank (LVP)
The Floor You See Is Only As Good As The Floor Beneath It
One of the biggest misconceptions about LVP is that the plank itself will hide imperfections in the existing floor. In reality, resilient flooring is designed to be installed over an appropriate, prepared substrate. Shaw’s Commercial Resilient Plank Installation Guide calls for a concrete substrate that is flat and smooth within 1/8’’ over 6’ or 3/16’’ over 10’, and requires the substrate to be structurally sound, clean, and dry. (Shaw Floorté Classic Series Installation Guide & Tips, 2026) Those tolerances demonstrate why simply sweeping a slab and starting installation is not enough for a professional commercial project. (Team, 2026)
Small High Spots Can Become Big Problems
A concrete floor does not have to look dramatically uneven to cause trouble. A relatively small ridge, hump, depression, or transition can cause the planks to sit against the substrate. (Luxury Vinyl Tile Installation, 2024) Floating products rely on the underlying surface to provide consistent support, while glue-down products depend on a properly prepared surface for adhesive contact. (Luxury Vinyl Tile and Plank Installation Methods, 2022) Shaw’s installation requirements specifically call for correcting depressions and cracks with an appropriate cementitious patching or leveling compound when necessary. (PDMS - Commercial Rigid Core InLine Level Edge Direct Glue Installation, 2023)
When Uneven Floors Can Show Through LVP
LVP is resilient, but that does not mean it’s a structural leveling material. When the substrate contains irregularities, the finished flooring can reflect those conditions through visible and tactile changes. Areas with poor support may move differently from properly supported areas, and irregularities can become noticeable under the finished floor as space receives normal foot traffic. (Subfloor Preparation | LVT installation, n.d.) This is one reason manufacturers place specific flatness requirements on the substrate rather than treating floor preparation as an optional cosmetic step.
The “Telegraphing” Problem
Flooring professionals often use the term telegraphing to describe substrate imperfections becoming visible through a finished resilient floor. Cracks, grooves, depressions, ridges, old adhesive residue, seams, and other irregularities can create problems for resilient flooring systems. (Resilient Floor Covering Installation Guidelines, 2022) ASTM F710 specifically identifies cracks, grooves, depressions, control joints, and other irregularities as conditions that should be filled or smoothed before installing resilient flooring. (ASTM F710-26 - Standard Practice for Preparing Concrete Floors to Receive Resilient Flooring, n.d.)
Moisture Is Another Hidden Enemy
Flatness is only part of the equation. Concrete can look completely dry on the surface while still containing moisture that can create problems for resilient flooring systems. (International, n.d.) ASTM F710-26 states that concrete slabs should be tested for moisture regardless of their age or grade level and that concrete floors should also be tested for pH before resilient flooring installation. The standard also requires an effective moisture vapor retarder beneath on- or below-grade concrete floors. (F710 Standard Practice for Preparing Concrete Floors to Receive Resilient Flooring, 2026)
Why Moisture Testing Matters In Commercial Buildings
Commercial projects can involve larger concrete slabs, ground-level floors, renovations over older slabs, and spaces with complicated histories. A slab that has been in a building for years is not automatically exempt from moisture testing. (International, 2019) ASTM’s guidance specifically states that all concrete slabs should be tested for moisture, regardless of age or grade level. (ASTM F710-22 - Standard Practice for Preparing Concrete Floors to Receive Resilient Flooring, 2022) That makes moisture testing part of responsible pre-installation planning, not something to consider only when obvious moisture problems appear.
Old Adhesive Can Be A New Flooring Problem
Renovation projects can bring another challenge: What is already sitting on the floor. Previous adhesives, coatings, curling compound, sealers, paint, dust, grease, and other contaminants can interfere with the new flooring systems. (Gross, 2024) Shaw’s commercial installation guidance requires the substrate to be free of contaminants and other conditions that could prevent or reduce proper adhesion. ASTM F710 similarly calls for resilient flooring substrates to be clean and free of substances that could interfere with adhesive bonding. (ASTM F710-26 - Standard Practice for Preparing Concrete Floors to Receive Resilient Flooring, 2026)(How do I prepare floors and other surfaces for painting with a specialist industrial coating? - Pronto Paints | Pronto Paints https://prontopaints.co.uk/2024/09/09/how-do-i-prepare-floors-and-other-surfaces-for-painting-with-a-specialist-industrial-coating/)
Why “Just Put More Adhesive Down” Doesn’t Fix It
When the substrate is poorly prepared, adding more adhesive doesn’t replace correcting the underlying condition. Adhesive systems are designed around specific substrate requirements, including cleanliness, moisture conditions, flatness, and compatibility. (LVT/LVP Installation: Surface Preparation Guide, 2026) Armstrong’s Professional Installation Guidance includes specific requirements for concrete, underlayment, patches, bond testing, and accepted moisture limits, showing that substrate treatment is treated as its own technical stage of resilient floor installation. (F-5061 Installation Guide, n.d.)
Leveling Compound Has A Job To Do
When a commercial slab contains localized depressions or unacceptable variations, an appropriate patching or leveling compound can help create the surface required for flooring installation. The important word is appropriate. ASTM F710 requires filling or smoothing surface irregularities with latex patching or leveling compounds that meet its requirements for the specific flooring system. (ASTM F710-22 - Standard Practice for Preparing Concrete Floors to Receive Resilient Flooring, 2022) The correct material and installation procedure therefore depend on the flooring manufacturer’s specifications and the substrate conditions. (Installation Guides, 2024)
Commercial Spaces Leave Little Room For Mistakes
In a commercial environment, flooring problems can become more than an aesthetic annoyance. (Flooring Beyond Aesthetics: Safety, Compliance & Brand Impact in Commercial Spaces, 2025) A large installation may include offices, corridors, classrooms, healthcare spaces, retail areas, warehouses, or other occupied environments in which repairs could interrupt normal operations. Shaw notes that subfloor preparation can add time to a flooring project but is necessary for a successful installation. (Vinyl Flooring Installation | Shaw Floors, 2023) Planning substrate repairs before installation can help prevent avoidable disruptions after the finished flooring is in place. (Substrate Preparation for Luxury Vinyl Tile and Plank: What the Manufacturer Won’t Tell You, 2026)
The Installation Method Matters
Not every LVP product is installed the same way. Some products use floating lock systems, while others are glued directly to the substrate. Armstrong notes that luxury vinyl products can use different installation methods, including locking systems and glue-down applications, and underlines that because product construction varies, you should always check subfloor requirements against the exact flooring and adhesive system being used. (Luxury Vinyl Flooring Installation, 2024)
A Good Flooring Installation Starts Before The First Blank
Professional flooring installation is as much about preparation as it is about placing the finished materials. (Subfloor Preparation to Receive Finish Flooring, 2019) Before installation begins, evaluate the substrate for flatness, cleanliness, structural conditions, moisture, and other conditions identified by the manufacturer. ASTM F710 supplies a structure for evaluating concrete floors for resilient flooring, while commercial manufacturers such as Shaw provide product-specific substrate requirements and tolerances. (ASTM F710-26 - Standard Practice for Preparing Concrete Floors to Receive Resilient Flooring, 2026)
Protecting The Investment
Owners invest in premium commercial LVP, so the finished floor performs and looks as designed. Proper subfloor preparation assists protect that investment via addressing problems before they become part of the finished installation. (Gross, 2023) It may involve grinding, cleaning, patching, leveling, moisture testing, or other corrective work, but those steps are not simply extra work added to the project; they are part of creating an acceptable substrate for the flooring system.
The Bottom Line
Expensive LVP cannot compensate for an improperly prepared subfloor. A beautiful plank installed over an uneven, contaminated, moisture-compromised substrate can inherit problems from the surface underneath it. For commercial construction, treat subfloor preparation as an important phase of flooring installation, not an afterthought. By identifying irregularities, testing concrete, correcting unacceptable conditions, and following the flooring manufacturers’ requirements, contractors and building owners can give their LVP installation the foundation it needs to perform as intended.
References
ASTM International. ASTM F710-26: Standard Practice for Preparing Concrete Floors to Receive Resilient Flooring. 2026. ASTM International — F710 Standard
Shaw Contract Group. Commercial Resilient Plank & Tile Installation Guidelines. Shaw Contract Installation Guidelines
Shaw Industries. Loose-Lay Vinyl Plank Installation — Substrate Preparation. Shaw Installation Guidance
Armstrong Flooring Pro. Installation Guides and Technical Resources. Armstrong Flooring Pro Installation Guides
Armstrong Flooring. F-5061 Installation Guide — Subfloors and Underlayments. Armstrong F-5061 Installation Guide
Shaw Floors. Vinyl Flooring Installation Guidance and FAQs. Shaw Floors Vinyl Installation