Is 3mm Acoustic Underlay Enough? Honest Answer

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

An honest answer from our acoustic team — we will tell you the truth.

Honest answer: 3mm provides genuine improvement, but for serious noise problems — especially in flats — it is rarely enough on its own.

What 3mm Achieves

Our 3mm rubber underlay achieves up to 54dB impact noise reduction. That is a real improvement — but compare it to 74dB from our 6mm version.

When 3mm Is Sufficient

• Detached house — no flat below
• Top floor flat — no neighbours below
• Minor noise problem only
• Budget is the primary constraint
• Floor raise absolutely cannot exceed 3mm

When 3mm Is Not Enough

• Mid-floor flat with noise-sensitive neighbours below
• Part E compliance required
• Severe, constant noise disturbance

For serious problems: 6mm at 74dB or 12mm system. The price difference is modest; the performance difference is not.