Should You Put Underlayment Under Vinyl Plank? Expert Guide
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 installing a vinyl plank floor, one of the most frequently asked questions is whether an underlayment is necessary beneath the planks. The short answer is generally yes, but the specifics depend on the type of subfloor you have, the product selection, and the desired outcome for comfort and sound control. Underlayment serves several critical functions that go beyond basic moisture protection, acting as a vital component that ensures the longevity and performance of your finished floor.
Understanding the Role of Underlayment
Underlayment is not merely a layer of plastic; it is a multi-functional system designed to solve specific problems associated with rigid flooring installations. For vinyl plank, which is often installed as a floating floor, the underlayment acts as a cushion that absorbs impact and reduces footfall noise from traveling through the structure. It creates a smooth, stable, and clean surface that minor imperfections in the subfloor, preventing the hard edges of old tile or rough concrete from telegraphing through the new vinyl surface.
Moisture Barrier Protection
One of the most crucial roles of underlayment is to manage moisture. If you are installing over a concrete slab, especially in a basement or a ground-level room, vapor transmission is a significant concern. Water vapor from the concrete can rise and become trapped beneath the vinyl, leading to mold growth, musty odors, and ultimately, the disintegration of the adhesive or the plank itself. A quality underlayment with a built-in moisture barrier acts as a shield, preventing the vapor from reaching the vinyl plank and ensuring a dry, stable environment for the flooring to reside.
Subfloor Type Dictates Underlayment Choice
The condition and material of your existing subfloor are the primary determinants of which underlayment you should choose. If you are laying vinyl over plywood or OSB, a thin foam underlayment is often sufficient to provide comfort and sound damping. However, if the subfloor is old, cracked tile or uneven concrete, you may need a thicker, more robust underlayment that offers significant leveling properties. Skipping this step on an uneven surface will result in a floor that feels unstable and may even cause the planks to pop apart over time.
- Concrete Slabs: Require a moisture barrier and often a foam underlayment to manage texture and provide cushioning.
- Existing Tile: Needs a thin, glue-down underlayment that prevents the hard tile from creating pressure points on the vinyl.
- Wood Subfloors: Can typically use thinner foam underlayments focused on noise reduction and comfort.
The Impact on Comfort and Acoustics
Beyond technical protection, underlayment significantly alters the feel and sound of your vinyl plank floor. Without it, vinyl can feel cold and hard underfoot, similar to tile. A quality foam or cork underlayment adds a slight spring back, making the floor warmer and more comfortable to stand on for extended periods. Acoustically, it absorbs the sound of footsteps and dropped objects, which is particularly important in multi-story homes where noise transfer to lower levels can be a source of friction with family members or neighbors.
Do You Need Underlayment if the Floor Is Glued Down?
This is a common point of confusion. Even if you are opting for a "glue-down" installation rather than a floating floor, underlayment is still highly recommended. In this scenario, it acts primarily as a moisture barrier and a sound deadening layer. It ensures that any minor shifts in the subfloor do not crack the adhesive or the vinyl surface above. Skipping it in a glued application risks voiding warranties and reduces the lifespan of the floor by exposing it directly to the inconsistencies of the substrate.
Ultimately, investing in the right underlayment is an investment in the durability and enjoyment of your flooring. It is the unsung hero that keeps your vinyl looking pristine, feels good underfoot, and protects your home from the damaging effects of moisture. By selecting the correct type—whether it is a simple foam pad or a complex moisture-blocking membrane—you ensure that your vinyl plank installation performs at its best for years to come.
<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>
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