Vinyl flooring can give your home a new look without breaking the bank. Whether it needs a separate underlayment depends on the exact flooring system, the subfloor and any pad already attached to the planks.
Start with the flooring manufacturer’s installation instructions. If an additional acoustic underlayment is permitted, choose one specifically approved for that type of vinyl. QuietWalk LV QW100LV is a vinyl-specific option to consider; it is different from QuietWalk Plus, which the manufacturer does not approve for luxury vinyl.
Underlayment for Vinyl Flooring: QuietWalk LV
QuietWalk LV QW100LV — 100-Square-Foot Roll
QuietWalk LV is designed for compatible luxury vinyl plank and tile, including rigid-core WPC and SPC floors. It supports floating and double-glue-down installations. It is not an underlayment for sheet vinyl or vinyl composition tile (VCT).
QuietWalk LV QW100LV — 100 sq. ft.
- Vinyl-specific recycled-fiber underlayment with an attached vapor barrier.
- Nominal 1.4 mm thickness; 100-square-foot roll, 3 feet wide.
- For compatible floating or double-glue-down vinyl plank/tile systems; not sheet vinyl or VCT.
- Check your flooring’s thickness, attached-pad and installation requirements before use.
The QW100LV roll covers 100 square feet and is 3 feet wide, with a nominal thickness of 1.4 millimeters. Measure your floor area and allow for cuts when deciding how many rolls to order. Coverage is stated in square feet, not square meters.
Its recycled-fiber core and attached vapor barrier combine sound control with moisture management. Acoustic results depend on the complete floor and ceiling assembly; the material does not guarantee that footsteps will be inaudible in another room.
The current product listing specifies flooring 4 millimeters or thicker. The manufacturer’s installation instructions explicitly require at least 4 millimeters for double-glue-down work, and its specification sheet applies that minimum to commercial installations. Confirm the requirements for your exact floor rather than treating a thickness number as universal approval.
MP Global describes QuietWalk LV as compatible with pre-attached-pad flooring. That does not override your flooring brand’s restrictions: if the plank manufacturer prohibits another cushion layer, do not add one. A required moisture barrier is a separate question from an additional acoustic pad.
What to put under hardwood flooring covers a different flooring category; do not assume that a wood-floor underlayment is suitable for vinyl.
Pros
- Designed specifically for compatible vinyl plank and tile applications
- Thin recycled-fiber construction with an attached vapor barrier
- Factory lip-and-tape system for joining floating-installation seams
Limitations
- Not for sheet vinyl or VCT
- Requires approval for the exact floor, including any attached pad
- Does not replace subfloor leveling, moisture testing or repair of a leak
Why QuietWalk Plus and First Step Are Not Vinyl Substitutes
QuietWalk Plus QW100PLUS is sold for laminate and wood flooring. The manufacturer’s current product page explicitly excludes luxury vinyl and directs buyers to QuietWalk LV instead. The similar names do not make these interchangeable products.
ROBERTS First Step is specified for floating laminate and engineered wood flooring. That is not evidence of approval under vinyl. Choose a vinyl-specific product and verify the flooring instructions rather than relying on a general claim that any underlayment will work.
The other previously listed FLOORLOT and STEICO offers could not be confirmed as purchasable in their exact linked variants. They are not included as buying recommendations here. A brand name or a similar-looking roll or panel is not enough to establish the correct vinyl application.
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Prepare the Subfloor and Check Moisture
Underlayment is not a leveling compound. QuietWalk LV requires a flat, clean, smooth and dry subfloor. Repair uneven areas and defects using the methods allowed by the flooring and subfloor manufacturers before installing the pad.
Do not stack an extra fabric or foam layer to hide larger imperfections. Additional cushioning can conflict with the flooring’s support requirements. Use only the layer arrangement approved for the complete flooring system.
The QuietWalk LV specification gives a concrete moisture-emissions allowance of 6 pounds per 1,000 square feet per 24 hours. Higher readings require additional protection specified for the installation. Test the subfloor and resolve moisture sources; a vapor barrier is not a remedy for standing water or an active leak.
Antimicrobial treatment and moisture-management features are not a guarantee against mold. Installation conditions and maintenance still matter. Follow the floor manufacturer’s moisture limits as well as the underlayment requirements.
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Follow the Instructions for Your Installation Method
For a floating installation, QuietWalk LV’s instructions place the film side up and the fiber side down. Butt the underlayment seams together and seal them using the factory lip-and-tape system; do not overlap the cushion itself. Follow the specified seam offsets and perimeter clearance.
Double-glue-down installation has a different procedure and adhesive requirements. Follow the current underlayment, flooring and adhesive instructions together. The hardwood nailing instructions in a multipurpose product guide are not instructions to nail down vinyl planks.
If you have underfloor heating, confirm that the flooring, underlayment and heating system are compatible and observe their temperature limits. An insulating layer does not by itself guarantee a warm floor.
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The following video by Floors by Southern boys shows rigid-sheet underlayment being fastened over an OSB subfloor. It illustrates a different type of underlayment, not a roll-out acoustic pad and not the installation of QuietWalk LV QW100LV. Use the written instructions for your own flooring and underlayment system.
Choose an underlayment by compatibility first, then coverage, moisture requirements and acoustic needs. QuietWalk LV is one vinyl-specific option when your flooring permits it. For the separate topic of laminate emissions, see the EPA’s laminate flooring and formaldehyde guidance; it is not a certification of a vinyl floor or this underlayment.
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