Should You Put Underlayment Under Vinyl Flooring? Key Benefits Explained
07.05.2021 ... Both of those are built into vinyl planks already I would advise not installing an underlayment. If there are imperfections in your subfloor, .....
When preparing to install new vinyl flooring, one of the most frequent questions that arises is whether an underlayment is necessary. While vinyl is known for its durability and relative ease of installation, skipping the underlayment is rarely the best move. Underlayment acts as a critical intermediary layer between the subfloor and the finished surface, providing essential benefits that impact the longevity, comfort, and appearance of your floor. Ignoring this step can lead to premature wear, aesthetic issues, and a floor that feels hard underfoot.
Understanding the Role of Underlayment
Underlayment is not merely a layer of cushioning; it serves several specific technical functions that protect your investment. For luxury vinyl plank (LVP) and luxury vinyl tile (LVT), a smooth and stable substrate is essential to prevent the underlying imperfections of the subfloor from telegraphing through the thin surface layer. If the subfloor has minor dips, cracks, or unevenness, the vinyl will often show these flaws as ridges or bumps once installed. A proper underlayment material, such as a thin foam or fiber panel, creates a uniform plane, ensuring a seamless visual finish that looks professional and clean.
Moisture Management and Protection
One of the most vital functions of underlayment is moisture control. Depending on the location of the installation—such as a basement, bathroom, or kitchen—moisture vapor rising from the concrete slab can wreak havoc on dimensional stability. Even materials labeled as moisture-resistant can be compromised over time if subjected to constant dampness without a barrier. A quality underlayment with a moisture barrier acts as a shield, preventing the liquid from seeping up and causing the vinyl to warp, buckle, or develop mold underneath the planks. This is especially critical for glue-down installations where the floor is permanently adhered to the subfloor.
Sound Dampening and Comfort
Another significant advantage of installing underlayment is the reduction of ambient noise. Vinyl floors are naturally dense, which means they can transmit footfall, dropped objects, and music noise to the rooms below. Underlayment adds a layer of mass and absorption that helps to deaden these sounds, making the space more comfortable for residents below. Furthermore, it softens the surface slightly, providing a slight give underfoot that reduces fatigue when standing in the kitchen or laundry area for extended periods. This combination of noise reduction and slight elasticity enhances the overall quality of the living space.
Subfloor Compatibility and Preparation
The necessity and type of underlayment can vary depending on the condition of your subfloor. If you are installing over a concrete slab, you typically need a specific underlayment that addresses moisture vapor transmission (MVTR) rather than just cushioning. For installations over existing resilient flooring or well-prepared plywood, a thinner underlayment focused on smoothing and sound reduction may suffice. Here is a quick reference guide to common scenarios:
| Subfloor Type | Recommended Underlayment Type |
|---|---|
| Concrete Slab | Moisture-blocking foam or membrane |
| Plywood/Oriented Strand Board (OSB) | Thin foam for smoothing and sound reduction |
| Existing Vinyl/Tile | Thin leveling compound or specific smoothing underlayment |
Longevity and Warranty Considerations
From a practical standpoint, adding underlayment extends the lifespan of the flooring. By providing a stable surface, it prevents the planks from flexing excessively when walked on, which reduces the stress on the locking mechanisms. This helps prevent the "popping" or separation of seams that can occur over time. Moreover, many premium vinyl flooring manufacturers require the use of an underlayment to validate the product warranty. Skipping this step might save a small amount of time or material cost initially, but it risks voiding the warranty and necessitating an early, costly redo.
Final Recommendations for Installation
Ultimately, the answer to the question is a resounding yes: you should put underlayment under vinyl flooring in nearly every scenario. The benefits of moisture protection, noise reduction, subfloor leveling, and increased durability far outweigh the minimal additional cost. When selecting the product, ensure it is compatible with your specific vinyl type and follow the manufacturer’s instructions regarding acclimation and installation. Taking this extra step guarantees that your floor looks great, performs well, and stands the test of time.
<strong>Should I put underlayment down under new lifeproof luxury vinyl ...</strong><p>07.05.2021 ... Both of those are built into vinyl planks already I would advise not installing an underlayment. If there are imperfections in your subfloor, ...</p>
<strong>Why You Should Put Underlayment Under Your Vinyl Plank Flooring</strong><p>Adding an extra underlayment will provide improved sound reduction, insulation, moisture protection, and longevity to the flooring.</p>
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<strong>Is underlayment necessary for 22mil Lifeproof LVP? - Facebook</strong><p>16.05.2025 ... Otherwise, adding an additional underlayment (even the thin plastic) can cause too much flex or cushion underneath the flooring and lead to ...</p>
<strong>Best Underlayment for Vinyl Plank Flooring - Panel Town & Floors</strong><p>You just need to be sure to install it correctly. Foam underlayment is not a moisture barrier and can act as a water trap, leading to mold and must. Felt. Felt ...</p>
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<strong>What is the best underlay for vinyl & LVT flooring - Screwfix</strong><p>Although underlay isn't always necessary for vinyl flooring, it can significantly improve comfort and longevity. Check whether your flooring type requires ...</p>
<strong>Vinyl flooring buying guide at B&Q</strong><p>Most vinyl floors don't need an underlay. If the surface you're laying on is level and smooth, a well-cushioned vinyl floor should be fine on its own. Our ...</p>
<strong>Is underlayment necessary when LVP has pad? - Bogleheads.org</strong><p>20.04.2024 ... In some cases, a plastic underlayment, essentially a vapor barrier, is recommended when installing LVP on a slab, especially in a basement.</p>
<strong>The Complete Guide to Floor Underlayment - Lowe's</strong><p>14.07.2025 ... High-density foam is the best choice for laminate flooring. Foam underlayment allows for the expansion and contraction of laminate floors, which ...</p>
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<strong>How To Prep Wood Subfloor for Luxury Vinyl Plank ... - YouTube</strong><p>25.08.2023 ... Putting underlayment under lvp with a padding attached is not a good idea. The squishy nature of it can break joints. If you have to bring ...</p>
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<strong>Two reasons why you need underlay for vinyl flooring</strong><p>Underlay prevents the vinyl from effectively adhering to the subfloor below. . Floors under 4mm thickness should not be installed with an underlay. Even thin ...</p>
<strong>You Ask We Answer | Flooring Underlayment Options</strong><p>16.02.2021 ... If you have concerns about moisture from your concrete subfloor, it's generally recommended to use a moisture barrier or vapor barrier ...</p>
<strong>Do you need underlayment for laminate flooring over vinyl? - Quora</strong><p>17.02.2022 ... As long as your floor is flat and even, most vinyl planks now do not require underlayment.</p>
<strong>Do I need additional underlay for click lock vinyl flooring and how to ...</strong><p>30.04.2025 ... David A. Mazzacone Jr. No you do not need another underlayment since its not a concrete floor Secondly just remove the baseboards and put back ...</p>
<strong>Tips for Installing Vinyl Plank Over Concrete Floors - Lemon Thistle</strong><p>Moisture will get through, so even if you don't add an additional underlay, you do need to seal the concrete. ... put under the LVP but we have spots that crack ...</p>
<strong>Using underlay for vinyl - MyBuilder</strong><p>15.03.2024 ... Hi Tracey. Vinyl flooring is a product that is designed to go directly onto the floor without another product under it. if you put an underlay ...</p>
<strong>Should I Use Underlayment with Attached Pad Flooring? - floorMuffler</strong><p>13.09.2022 ... Increased wear and tear: Not using underlayment with attached pad flooring can result in a lack of durability. Without this layer, you may face ...</p>
<strong>Do I Need Flooring Underlayment? How To Choose? - Jona Panel</strong><p>The type of underlayment you need depends on your application; tile, wood, vinyl, laminate and so on. Here are a few examples of underlayment and the flooring ...</p>
<strong>What To Put Under Vinyl Flooring: An All-Inclusive Guide</strong><p>12.02.2024 ... Do you need to install underlayment for vinyl plank flooring? ... Installing underlayment for vinyl plank flooring is advisable, especially if the ...</p>
