Soundproof My Floor — Complete UK Solutions Guide
Soundproof My Floor — Complete UK Solutions Guide
Floor noise is one of the most common acoustic problems in UK homes and flats. Whether it's the thud of footsteps overhead, impact noise from children running, or airborne sound travelling through the floor structure, the right soundproofing solution can transform your home. This guide covers every proven method — from simple acoustic underlay to full independent floating floor systems — with real performance data and product recommendations to match your floor type and budget.
Under UK Building Regulations Part E, separating floors between dwellings must achieve a minimum DnT,w + Ctr of 45dB airborne and L'nT,w of 62dB impact. Pre-completion testing (PCT) is required for new builds and conversions. Our products are specified to meet and exceed these requirements.
Understanding Floor Noise: Two Types to Tackle
- Impact noise — footsteps, dropped objects, chair scraping. Travels directly through the floor structure. Requires mass and resilience at the floor level.
- Airborne noise — TV, music, voices. Travels through the air and floor structure. Requires mass and decoupling to block.
Most residential floor noise problems are impact-dominant, which is why acoustic underlay and floating floor systems are so effective — they break the vibration path before it enters the structure.
Choose Your Floor Type
Concrete Slab Floors
Concrete slab floors are common in purpose-built flats and modern ground floors. They have good inherent mass for airborne sound but can transmit impact noise efficiently due to their rigidity. The best solution is a high-performance acoustic underlay laid directly on the slab before your finished floor.
Recommended system for concrete slabs:
- For maximum impact reduction: 6mm Recycled Rubber Acoustic Underlay — industry-leading 74dB impact sound reduction, complies with UK Building Regs Part E. Ideal for laying under screed or directly under engineered wood and LVT.
- For a complete system: AcoustiLay 8 Premium Acoustic Flooring System — 12mm combined system delivering 30dB impact + 58dB airborne reduction. The highest-performing single-product solution available.
Performance data (concrete slab + 6mm rubber underlay):
- Impact sound reduction: 74dB ΔLw
- Compliant with Part E minimum of L'nT,w ≤ 62dB
- Suitable for screed overlay and direct-to-slab installation
Timber Joist Floors
Timber joist floors — common in Victorian, Edwardian, and 1930s–70s UK homes — are the most acoustically challenging. The void beneath the floorboards can act as a resonance cavity, and the lightweight structure allows both impact and airborne sound to pass easily. A multi-layer approach is needed for best results.
Recommended system for timber joist floors:
- Layer 1 (underlay): AcoustiLay 8 System — 12mm system combining impact and airborne performance in one layer
- Layer 2 (if needed): Add SilentCloud 6mm Acoustic Underlay beneath the AcoustiLay for additional mass
- Ceiling below: Resilient bar system + 2 layers plasterboard (see below-floor solutions)
Timber floor systems can achieve DnT,w + Ctr of 50dB+ with a correctly specified multi-layer approach.
Screed Floors
Liquid screed and sand-cement screed floors are found in new builds and refurbished flats. They benefit from inherent mass, but laying an acoustic underlay before the screed is poured (floating screed) is the gold standard for Part E compliance.
Recommended for screed floors:
- 6mm Recycled Rubber Underlay — specifically engineered for under-screed use. Compressive strength supports liquid screed without deformation. Achieves 74dB ΔLw.
- For 3mm variant where floor height is limited: 3mm Recycled Rubber Underlay — achieves 54dB reduction with minimal floor height loss.
Acoustic Underlay Solutions — Comparison Table
Not all acoustic underlays are equal. Here's how our range compares:
| Product | Thickness | Impact Reduction (ΔLw) | Best For | Floor Types |
|---|---|---|---|---|
| 3mm Recycled Rubber | 3mm | 54dB | Budget builds, height-limited spaces | Concrete, screed, timber |
| SilentCloud 6mm | 6mm | ~65dB | Residential, Part E standard | Concrete, timber, screed |
| 6mm Recycled Rubber (Pro) | 6mm | 74dB | Maximum performance, Part E compliance | Concrete, screed, under-screed |
| Cork Rubber Underlay | 3–5mm | ~60dB | Eco-conscious builds, thermal + acoustic | All floor types |
| AcoustiLay 8 System | 12mm | 30dB impact + 58dB airborne | Complete system, maximum all-round performance | Concrete, timber joist |
| SilentMat 15mm | 15mm | Industry-leading | Gym floors, commercial, heavy impact zones | Concrete, subfloor |
Floating Floor Systems
A floating floor system is the highest-performance solution for impact noise. The floor finish (engineered wood, LVT, laminate) is laid over acoustic underlay without being mechanically fixed to the subfloor. This decouples the walking surface from the structure, dramatically reducing the vibration energy that reaches the building fabric.
Key components of a floating floor system:
- Acoustic underlay — the foundation. Use AcoustiLay 8 for the complete package or 6mm rubber underlay as a standalone layer.
- Floor finish — engineered hardwood, LVT, or laminate, all floating (click-lock or glued to underlay only)
- Perimeter isolation — acoustic expansion strips at all walls to prevent flanking transmission
Floating floor systems can achieve ΔLw values of 18–30dB on their own, and when combined with a high-performance underlay, can push combined performance to 74dB+.
Tip: Always leave a 10–15mm expansion gap at walls and fill with acoustic sealant — not foam filler — to prevent flanking noise paths forming over time.
Below-Floor Solutions
When treating the floor from above isn't sufficient — or where the occupant below needs relief from impact noise — below-floor (ceiling-mounted) solutions on the room below deliver additional performance.
Resilient Bar Systems
Resilient bars (also called resilient channels or RC channels) are metal fixing systems that allow plasterboard to be suspended from joists without rigid contact. The bars flex, absorbing vibration and preventing direct transmission. Combined with 2 layers of dense plasterboard (25kg/m²+) and acoustic mineral wool in the joist void, resilient bar systems can add 8–15dB of additional impact reduction.
Independent Ceiling
An independent ceiling — a completely separate ceiling structure built beneath the existing floor/ceiling — provides the maximum acoustic isolation. By removing all physical contact between the two structures, flanking paths are eliminated. This approach is common in recording studios, home cinemas, and high-specification residential conversions.
Independent ceilings typically achieve an additional 15–25dB of isolation compared to treating the floor alone.
Coverage Calculator Guide
Working out how much acoustic underlay you need is simple:
- Measure your room — length (m) × width (m) = floor area in m²
- Add 10% for wastage — cutting around obstacles, doorways, and fitting to irregular shapes
- Formula: (Length × Width) × 1.1 = m² to order
Common room sizes:
| Room | Typical Size | Area (m²) | Order (with 10%) |
|---|---|---|---|
| Single bedroom | 3m × 3.5m | 10.5m² | 12m² |
| Double bedroom | 3.5m × 4m | 14m² | 16m² |
| Living room | 4m × 5m | 20m² | 22m² |
| Open-plan flat floor | 6m × 7.5m | 45m² | 50m² |
| Whole flat (2-bed) | Multiple rooms | ~65m² | 72m² |
Our rolls and packs cover standard areas — check each product page for exact roll dimensions. Most 6mm underlay rolls cover 10m² or 15m² per roll.
Frequently Asked Questions
1. What is the best acoustic underlay for Part E compliance?
For Part E compliance in new builds and conversions, use our 6mm Recycled Rubber Acoustic Underlay (74dB ΔLw) or the AcoustiLay 8 System (30dB impact + 58dB airborne). Both are engineered to meet or exceed Part E requirements. Always commission pre-completion testing for notifiable works.
2. Can I soundproof an existing floor without lifting the boards?
If your floor finish is laminate or engineered wood, you can lift and re-lay with acoustic underlay underneath — this is the most cost-effective approach. For tile or glued-down LVT, a floating overlay system (new boards over acoustic mat) may be more practical. For timber floorboards, filling joist voids with acoustic mineral wool is possible from below (if the ceiling is accessible).
3. How much impact noise reduction can I realistically expect?
A well-installed 6mm rubber underlay under a floating engineered wood floor on a concrete slab can reduce impact noise by 20–30dB as experienced in the room below — the difference between clearly audible footsteps and barely noticeable ones. The AcoustiLay 8 system can push this further.
4. Does acoustic underlay work under carpet?
Yes — acoustic underlay replaces standard carpet underlay. Use cork rubber underlay or SilentCloud 6mm under carpet for a comfortable and acoustically effective installation.
5. What is ΔLw and what number should I look for?
ΔLw (Delta Lw) is the weighted impact sound improvement index — it measures how much an underlay reduces impact noise compared to a bare concrete reference slab. Higher is better. For Part E compliance in converted flats, look for underlays achieving ΔLw of 17dB or higher as part of a tested floor system. Our 6mm rubber achieves 74dB — well above minimum requirements.
6. Can I install acoustic underlay myself?
Yes — all our acoustic underlays are DIY-friendly. Unroll, butt-join (tape with acoustic tape), and lay your floor finish over the top. No special tools required. Installation guides are available on each product page.
7. What's the difference between impact and airborne noise reduction?
Impact noise reduction (measured in ΔLw or L'nT,w) addresses footsteps and physical impacts. Airborne noise reduction (measured in DnT,w or Rw) addresses voices, music, and TV. Most acoustic underlay products address impact noise primarily. For significant airborne noise, a higher-mass system (AcoustiLay 8 or independent ceiling below) is recommended.
8. How do I know if my floor needs acoustic treatment for Building Regs?
Building Regulations Part E applies to: new builds, conversions (e.g., house to flats), and material changes of use. It does NOT typically apply to like-for-like repairs in existing homes. However, if you're converting a property or adding a new dwelling, acoustic floor treatment is mandatory and pre-completion testing is required. Our acoustic team can advise — contact us with your project details.
Shop All Floor Soundproofing Products
- 6mm Recycled Rubber Acoustic Underlay — 74dB — Best for: screed, concrete, Part E compliance
- AcoustiLay 8 Complete System — 30dB + 58dB — Best for: maximum performance, timber joist floors
- SilentCloud 6mm Premium Underlay — Best for: residential floating floors
- Cork Rubber Underlay 3–5mm — Best for: eco builds, carpet, LVT
- 3mm Recycled Rubber — 54dB — Best for: height-limited spaces, budget installs
- SilentMat 15mm — Best for: gyms, commercial, heavy impact zones