Tile & flooring

Vinyl Plank Underlayment on Concrete: Do You Need It?

Check the flooring instructions first: attached-pad LVP may only need a vapor barrier, while glue-down planks need no foam.

Direct answer

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 that exact layer.

check product instructions first: attached pad, installation type, concrete moisture, approved layers

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

Concrete slab with moisture history

Do not install yet

Test moisture and fix the source before covering the slab

Uneven or damp concrete

Do not hide it with soft foam

Repair flatness and moisture problems before installing

Flooring type	Usually add underlayment?	What to check
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
Concrete slab with moisture history	Do not install yet	Test moisture and fix the source before covering the slab
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 separate 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.

Sources & method

We reviewed these references while writing this answer. Figures are estimates — confirm safety-critical work with a professional. Last updated June 7, 2026.