Soundproof Acoustic insulation

Professional acoustic insulation for walls, floors and ceilings. Achieve Building Regulations Approved Document E, BB93 and BS 8233 compliance with our certified UK-stocked range of acoustic insulation materials. From mineral wool and mass loaded vinyl to rubber acoustic mats and cork composites — we stock the complete system, not just individual products.

Shop Timber Floating Floors | Acoustic Rubber Insulation | Airborne & Impact Noise Solutions

What Is Acoustic Insulation?

Acoustic insulation is any material or system used to reduce the transmission of sound between spaces — between floors, through walls, or across ceilings. Unlike thermal insulation (which simply resists heat flow), acoustic insulation must address two fundamentally different types of noise:

• Airborne noise — sound waves that travel through the air before striking a surface (voices, music, television, traffic)
• Impact noise — vibration generated by direct contact with a structure (footsteps, dropped objects, vibrating machinery)

Effective acoustic insulation works through three physical principles: mass (heavy materials resist sound transmission), absorption (porous materials convert sound energy into heat), and decoupling (isolating surfaces so vibration cannot travel directly through the structure). The most effective systems combine all three principles in a layered assembly.

How Acoustic Insulation Works

The Mass Law

The mass law states that sound transmission loss increases by approximately 6dB for every doubling of a material's surface mass. This is why dense materials such as mass loaded vinyl (MLV), concrete, and high-density rubber provide greater airborne sound insulation than lighter alternatives. Adding mass to a floor or wall assembly is the most reliable way to increase airborne sound insulation.

Absorption

Acoustic absorption materials — typically open-cell mineral wool, glass fibre, or foam — convert sound energy into heat through friction as sound waves pass through the material's fibrous structure. Absorption is particularly effective at mid and high frequencies (500Hz–4,000Hz) and is commonly used within wall cavities, ceiling voids, and floating floor systems to reduce reverberation and flanking sound paths.

Decoupling

Decoupling separates a floor finish, wall lining, or ceiling from the structural substrate, preventing impact vibration from transmitting directly through the building fabric. Resilient layers such as acoustic rubber mats, neoprene isolators, and spring mounts are used to introduce decoupling into floor and ceiling assemblies. Without decoupling, even a heavy floor system can fail to meet impact noise targets.

Understanding dB Ratings

Acoustic performance is expressed in decibels (dB). Key metrics include:

• Rw — weighted sound reduction index (laboratory, airborne)
• DnT,w — weighted standardised level difference (field test, airborne)
• ΔLw (Delta Lw) — weighted impact sound improvement index (impact noise reduction)
• L'nT,w — weighted standardised impact sound pressure level (field test, impact)
• STC — Sound Transmission Class (North American equivalent of Rw)
• IIC — Impact Insulation Class (North American equivalent of ΔLw)

Types of Acoustic Insulation

Performance Data

The following performance ranges are based on typical product specifications and independently tested assemblies. Actual in-situ performance may vary depending on substrate, workmanship, and flanking sound paths.

Building Regulations & Compliance

Approved Document E (England & Wales)

Building Regulations Approved Document E sets minimum acoustic performance standards for separating floors and walls in new dwellings, conversions, and rooms for residential purposes. Key requirements:

Failure to achieve Part E performance can result in building control refusal, costly remedial works, and potential liability for developers and contractors. Pre-completion acoustic testing is required for all new separating elements in England and Wales.

BB93 — Schools

Building Bulletin 93 specifies acoustic performance standards for all new and refurbished school buildings in England. Target values are more stringent than Approved Document E in many cases, with specific requirements for reverberation time, background noise levels, and sound insulation between teaching spaces. Our acoustic mineral wool and floating floor systems are suitable for BB93-compliant specifications.

BS 8233:2014 — Commercial Spaces

BS 8233 provides guidance on sound insulation and noise reduction for buildings including offices, hotels, and healthcare facilities. Recommended internal ambient noise levels range from NR 25 (recording studios, auditoria) to NR 45 (factories and industrial spaces). Our range of acoustic insulation products supports compliance with BS 8233 design criteria across all commercial building types.

Application Guide

Residential New Build

For new-build dwellings, Part E compliance is mandatory. Separating floors typically require a combination of structural concrete or timber joists, a resilient acoustic layer (rubber mat or cork underlay), a floating platform (chipboard or screed), and ceiling treatment below (independent ceiling with mineral wool and two layers of plasterboard). Our technical team can provide a full system specification.

Residential Conversion

Converting a house into flats requires acoustic treatment of all separating floors and walls. Timber joist floors typically require an Independent Ceiling Treatment (ICT) below and a floating floor above to achieve the conversion target of L'nT,w ≤ 64dB. Our timber floating floor systems are designed specifically for retrofit conversion projects.

Schools (BB93)

School acoustic specifications require careful selection of products with independently tested performance data. Our acoustic mineral wool insulation and high-performance floating floor systems are suitable for BB93 compliance in primary, secondary, and higher education buildings.

Offices & Commercial (BS 8233)

Open-plan offices, meeting rooms, and private offices each have different acoustic requirements under BS 8233. Our range of acoustic wall and ceiling products enables specifiers to achieve the required sound insulation between offices and the background noise targets set out in BS 8233.

Home Cinema & Recording Studio

Home cinema and recording studio applications require the highest levels of acoustic isolation available. A full room-within-a-room construction — using decoupled walls, floating floors, and independent ceilings — can achieve 50–65dB+ of sound insulation. Our team can assist with full studio acoustic specifications.

Industrial & Commercial Noise Control

Plant rooms, generator enclosures, and industrial machinery applications require heavy mass barriers and high-density acoustic panels. Our MLV and composite acoustic mat products are suitable for industrial noise control applications requiring Rw 30dB+.

Buying Guide — How to Choose

Step 1: Identify Your Noise Problem

• Airborne noise (voices, music, TV) → prioritise mass: MLV, mineral wool, dense composite mats
• Impact noise (footsteps, dropped objects) → prioritise decoupling: rubber mats, cork underlay, floating floor systems
• Both types → layered system combining mass, absorption, and decoupling

Step 2: Identify Your Substrate

• Concrete floor → acoustic rubber mat or cork underlay + floating platform
• Timber joist floor → resilient bar ceiling below + mineral wool + floating floor above
• Solid masonry wall → independent wall lining with mineral wool + MLV
• Stud wall → mineral wool in cavity + additional mass layer

Step 3: Check Your Performance Requirement

• Part E new build → DnT,w ≥ 45dB / L'nT,w ≤ 62dB → full system required
• Part E conversion → DnT,w ≥ 43dB / L'nT,w ≤ 64dB → system with test data
• General improvement (no regulation) → product-level ΔLw/Rw data sufficient

Installation Overview

Floating Floor Installation

1. Prepare substrate — clean, level, dry
2. Lay acoustic resilient layer (rubber mat or cork underlay) — butt joints, no gaps
3. Turn up at perimeter to form acoustic break at wall junction
4. Lay floating platform (chipboard, screed, or acoustic panels) — staggered joints
5. Ensure no rigid fixings penetrate the resilient layer (this creates a sound bridge)
6. Install expansion gaps at all perimeters and fill with acoustic sealant

Independent Wall Lining

1. Fix resilient channels or independent stud frame — do not allow rigid contact with the existing wall
2. Fill cavity with acoustic mineral wool — full thickness, no voids
3. Fix two layers of plasterboard (staggered joints) to the independent frame
4. Seal all perimeter junctions with acoustic sealant
5. Do not allow pipes or conduits to bridge the cavity

Common Installation Mistakes

• Leaving gaps or voids in the acoustic layer (sound travels through the path of least resistance)
• Rigid fixings that bridge the resilient layer (creates sound bridges that negate the decoupling)
• Unsealed perimeter junctions (flanking transmission bypasses the main acoustic treatment)
• Insufficient mass (a single layer of plasterboard is rarely sufficient for Part E compliance)

Frequently Asked Questions

What acoustic insulation do I need to meet Building Regulations Part E?

To meet Part E for separating floors in new builds (DnT,w ≥ 45dB / L'nT,w ≤ 62dB), you typically need a full system: resilient acoustic layer + floating platform + independent ceiling with mineral wool. No single product achieves Part E in isolation — you need a tested assembly. Contact us for a free system specification.

What is the difference between ΔLw and Rw?

ΔLw (Delta Lw) measures a product's improvement to impact sound insulation — higher is better. Rw measures a product or assembly's airborne sound reduction — again, higher is better. DnT,w and L'nT,w are the in-situ field test equivalents of Rw and Ln,w respectively and are what Building Regulations compliance is assessed against.

How much can acoustic insulation reduce noise?

A well-specified acoustic floor system can reduce impact noise by 20–30dB and airborne noise by 45–55dB (as an assembly). In practical terms, 10dB reduction is perceived as roughly halving the loudness; 20dB makes sounds appear four times quieter. A full floating floor system with independent ceiling can reduce footstep noise from clearly audible to barely perceptible.

Can acoustic insulation be installed under underfloor heating?

Yes, but you must select products with a sufficiently low thermal resistance (tog) value to avoid impeding heat transfer. Many rubber and cork acoustic underlays are UFH-compatible — check the product specification for tog rating. We can advise on compatible products for your specific UFH system.

Is mineral wool acoustic insulation the same as thermal insulation?

Not exactly. Acoustic mineral wool is typically manufactured at higher densities (45–100kg/m³) than standard thermal mineral wool (10–23kg/m³). The higher density improves sound absorption performance at lower frequencies. Standard thermal mineral wool provides some acoustic benefit but is not optimised for acoustic applications.

How thick does acoustic insulation need to be?

Thickness requirements vary by application. For wall cavities, 50–100mm of acoustic mineral wool is typical. For floor underlays, 5–15mm of rubber or cork provides meaningful impact noise improvement. Thicker is generally better, but the limiting factor is usually available floor build-up height or wall cavity depth.

Does acoustic insulation also provide thermal insulation?

Many acoustic insulation materials — particularly mineral wool and cork — provide useful thermal insulation as a secondary benefit. However, acoustic and thermal performance should be specified separately; a product optimised for acoustics may not provide the thermal resistance required for Building Regulations Part L compliance.

Can I fit acoustic insulation myself?

Basic acoustic underlay installation under hard flooring is a straightforward DIY task. Full floating floor systems and independent wall linings require more careful attention to detail — particularly avoiding sound bridges and sealing all junctions. For Part E compliance projects, professional installation is strongly recommended as workmanship significantly affects in-situ acoustic performance.

Why Choose Sound Deadening UK?

• Full system range — we stock every layer of an acoustic system, not just individual products
• Technical expertise — acoustic specialists available for free system specification advice
• UK stock — all products held in UK warehouses for fast despatch
• Certified performance data — all products supplied with independently tested acoustic data
• Trade pricing — competitive bulk pricing for contractors, developers, and specifiers
• Free delivery over £50 on all UK mainland orders

Need a specification? Browse our floating floor systems, acoustic rubber insulation, and airborne and impact noise solutions — or contact our technical team for a free system recommendation.