XPE underlayment is one of the most common materials under laminate and engineered wood floors. It smooths the subfloor, blocks moisture, reduces impact noise and adds a slight cushion underfoot. This guide covers thickness, density and foil-faced options so you can pick the right XPE underlayment for your project.
Why Use XPE Underlayment?
- Moisture barrier — closed-cell XPE stops damp rising from the subfloor, protecting laminate planks.
- Impact sound reduction — absorbs footfall noise, improving acoustic comfort in apartments and offices.
- Surface levelling — fills minor subfloor imperfections so laminate locks together cleanly.
- Thermal insulation — adds a warm layer underfoot.
Which Thickness Should You Choose?
- 2 mm — the standard choice for most laminate floors; low compression, stable joints.
- 3 mm — extra comfort and impact absorption where the subfloor is smooth.
- 5 mm — higher acoustic performance; check manufacturer limits, as very thick underlayment can stress plank joints.
Density Matters
Thickness alone does not define quality. Higher-density XPE (60-100 kg/m³) resists compression so the floor does not sink under furniture, and it recovers better over time. Low-density underlayment is cheaper but can pack down, leaving visible ridges at the seams.
Foil-Faced XPE for Underfloor Heating
XPE laminated with aluminium foil reflects radiant heat upward, making foil-faced underlayment the right choice above underfloor heating. It also gives a low-friction surface that makes laminate easier to lay. See our laminated foam page and underfloor heating insulation foam.
Installation Notes
- Use a single layer at the thickness your flooring manufacturer approves.
- Leave a small gap at the walls so the floor can expand and contract.
- Overlap seams or tape them to keep the moisture barrier continuous.
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Related Reading
See also: Flooring foam hub · Floor damping foam · XPE foam product page · How to choose foam density & thickness