How to Reduce Impact Noise Between Floors — Complete UK Guide

Apr 7, 2026

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

Impact noise between floors — the thud of footsteps, the scrape of chairs, the clatter of objects dropped — is the most common source of neighbour noise complaints in UK flats and multi-storey properties. This guide covers the complete approach to reducing it, from the physics to the products.

Understanding Impact Noise

Impact noise is structure-borne. When a foot strikes the floor, it creates mechanical energy that propagates through the floor-ceiling assembly as a vibration wave, then radiates as airborne sound in the room below. Unlike airborne noise (voices, music), which attenuates with mass and density, impact noise requires resilience — a material that absorbs and dissipates mechanical energy before it enters the structure.

This is measured as ΔLw (weighted impact improvement) in laboratory conditions. Higher values mean more energy absorbed:

The Complete System Approach

Maximum impact noise reduction requires treating both ends of the transmission path: the floor above and the ceiling below.

Step 1: Floor Treatment (Above)

The acoustic underlay under the floor covering is the primary impact attenuator. Specify the highest ΔLw underlay that the floor height constraints allow:

Step 2: Ceiling Treatment (Below)

A decoupled ceiling dramatically increases both impact and airborne performance. Resilient bars — metal channels fixed to existing ceiling joists with acoustic fixings, onto which plasterboard is attached — create a mechanically isolated ceiling surface. Our resilient bar systems provide the decoupling needed for maximum performance in timber joist floor configurations.

The combination of acoustic underlay above and a resilient bar ceiling below achieves the best possible impact noise reduction without structural intervention.

Step 3: Joist Void Treatment

For timber joist floors, filling the void between joists with acoustic mineral wool quilt (typically 100mm deep) significantly reduces the airborne resonance that amplifies both impact and airborne noise. This does not affect impact performance directly, but it addresses the low-frequency 'boom' that characterises poor acoustic performance in timber-framed buildings.

Flanking: The Hidden Culprit

Even a perfectly isolated floor can fail to achieve the expected performance if flanking paths are left untreated. Common flanking routes for impact noise include:

  • The wall-floor junction — sound travels through the base of the wall, bypassing the floor assembly
  • Service pipes running vertically through the structure
  • Rigid fixing of the floor to the wall (skirting boards screwed through the floor)

Mitigate flanking by turning the underlay up walls at all perimeters, using flexible acoustic mastic at thresholds, and never fixing skirting through the floor to the subfloor.

Real-World Performance Expectations

With our 6mm Rubber Underlay (74 dB ΔLw) on a concrete subfloor under a floating LVT or laminate floor, the practical result is:

  • Normal walking: barely audible below
  • Running children: noticeably reduced but still detectable
  • Dropped heavy objects: significantly attenuated

Adding a resilient bar ceiling below reduces even these residual impacts further. The 12mm Acoustic System combined with ceiling treatment represents the best achievable performance without structural modifications.

Shop impact noise solutions: 6mm Rubber (74 dB) | 3mm Rubber (54 dB) | 12mm System | Resilient Bar | Full Range
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