Do I Need Acoustic Underlay for a Floating Floor?

Written by our acoustic insulation specialist — 15+ years experience supplying soundproofing to UK homeowners, developers and contractors. About our experts.

From our acoustic insulation specialist.

Yes — in almost every case, acoustic underlay is an essential component of a floating floor system, not an optional extra.

What Is a Floating Floor?

A floating floor is a floor finish (laminate, LVT, engineered wood) that is not fixed to the subfloor — it floats on top. This inherently provides some acoustic isolation, but without a proper acoustic underlay layer, it is insufficient for serious noise reduction.

How Acoustic Underlay Improves Floating Floors

The underlay sits between the subfloor and the floating floor finish. It provides: resilience (decoupling the floor from the structure), mass (for airborne noise), and compression resistance (preventing the floor from bottoming out on impact). Our 6mm rubber underlay is the optimal choice for most floating floor applications — it provides 74dB impact reduction and will not compress under heavy furniture.

What Happens Without Acoustic Underlay

A floating floor without acoustic underlay transmits impact noise almost as effectively as a directly bonded floor. The air gap alone provides minimal isolation. For meaningful noise reduction, always use an acoustic underlay. For compliance with Building Regs Part E, see our 12mm acoustic flooring system which includes all required components.