Do I Need Underlayment for Vinyl Plank Flooring on Concrete?
A direct guide to vinyl plank underlayment on concrete, including attached pad, vapor barrier, glue-down planks, and soft-underlayment risks.
Maybe. For vinyl plank flooring on concrete, the product instructions decide. Many click-lock or rigid-core planks with attached pad do not need extra cushion, but may still require a vapor barrier over concrete. Glue-down and peel-and-stick vinyl usually need a smooth, dry, flat concrete surface, not foam underlayment. Do not add soft underlayment unless the flooring maker approves it.
What goes under vinyl plank on concrete
Rigid or click LVP with attached pad
Usually no extra cushion
Whether a 6 mil poly or vapor barrier is required over concrete
Rigid or click LVP without pad
Only an approved LVP underlayment
Thickness, compressive strength, and locking-system approval
Glue-down vinyl plank
No foam underlayment
Concrete flatness, dryness, primer, and adhesive instructions
Peel-and-stick vinyl
No foam underlayment
Smoothness, cleanliness, and whether the concrete needs primer
Uneven or damp concrete
Do not hide it with soft foam
Repair flatness and moisture problems before installing
The risk with extra padding
Extra-soft underlayment can make floating vinyl plank joints flex under foot traffic. That movement can create gaps, broken locks, hollow spots, or warranty problems. A vapor barrier is different from a cushion: it controls moisture vapor and is often much thinner than foam underlayment.
Before buying underlayment
- 1Find the exact brand, collection, thickness, and installation method for your vinyl plank.
- 2Read the installation instructions for concrete, moisture testing, vapor barrier, and approved underlayment.
- 3Check whether the plank already has an attached pad.
- 4Fix high spots, low spots, cracks, dust, paint, adhesive residue, and moisture issues before installation.
- 5Use only an underlayment type that the flooring manufacturer approves in writing.
FAQ
Do I need underlayment for vinyl plank with attached pad on concrete?
Usually you do not add another soft underlayment unless the flooring instructions specifically allow it. Many products with attached pad may still require a vapor barrier over concrete.
Can too much underlayment damage vinyl plank flooring?
Yes. Extra cushioning can let locking joints flex, gap, or break. Use only underlayment types and thicknesses approved by the flooring manufacturer.
Do glue-down vinyl planks need foam underlayment?
No. Glue-down vinyl normally needs a smooth, clean, dry, flat subfloor, not foam underlayment. The adhesive and flooring instructions should specify any primer or moisture-control step.