What is the best insulation for soundproofing?

For airborne noise (speech, TV), high-density mineral wool slabs (like Rockwool RWA45) are best because they have the mass required to absorb sound energy. For impact noise (footsteps), you need decoupling materials like acoustic underlay or resilient bars.

How much noise reduction can I expect?

A standard stud wall with 50mm of acoustic mineral wool and a single layer of plasterboard reduces sound by about 35-40dB. Adding a second layer of acoustic plasterboard can increase this to over 50dB, which is the difference between hearing a conversation clearly and hearing nothing at all.

Is acoustic plasterboard better than standard board?

Yes. Acoustic plasterboard (often blue-faced) is significantly denser than standard board. Mass is the most important factor in stopping sound, so the heavier the board, the better it will perform.

Can I soundproof an existing wall without ripping it down?

You can 'overboard' existing walls with acoustic boards or use a slimline 'independent wall' system, though this will reduce your room size slightly. For the best results, filling the cavity with acoustic mineral wool is recommended.

What is the best insulation for soundproofing?

For airborne noise (speech, TV), high-density mineral wool slabs (like Rockwool RWA45) are best because they have the mass required to absorb sound energy. For impact noise (footsteps), you need decoupling materials like acoustic underlay or resilient bars.

How much noise reduction can I expect?

A standard stud wall with 50mm of acoustic mineral wool and a single layer of plasterboard reduces sound by about 35-40dB. Adding a second layer of acoustic plasterboard can increase this to over 50dB, which is the difference between hearing a conversation clearly and hearing nothing at all.

Is acoustic plasterboard better than standard board?

Yes. Acoustic plasterboard (often blue-faced) is significantly denser than standard board. Mass is the most important factor in stopping sound, so the heavier the board, the better it will perform.

Can I soundproof an existing wall without ripping it down?

You can 'overboard' existing walls with acoustic boards or use a slimline 'independent wall' system, though this will reduce your room size slightly. For the best results, filling the cavity with acoustic mineral wool is recommended.

Acoustic Insulation Calculator

Estimate soundproofing materials and noise reduction for your project.

Wall / Floor Area (m²)

Insulation Type

Thickness (mm)

Layers

Soundproofing Estimate

Fitting Tip: Effective soundproofing relies on **mass** and **decoupling**. Using high-density mineral wool (45kg/m³+) between studs and then adding two layers of acoustic plasterboard with staggered joints is the most effective way to block airborne noise like speech and TV.

Soundproofing Science: The UK Guide

Airborne vs Impact Noise

To effectively soundproof a room, you must first identify the type of noise. **Airborne noise** (talking, music) is blocked by mass, while **impact noise** (walking, furniture moving) requires decoupling.

Our **acoustic insulation calculator** helps you estimate the quantity of high-density materials required to create a quiet, peaceful environment in your home.

Typical Noise Levels

Quiet Library~30 dB

Normal Conversation~60 dB

Loud Television~80 dB

The Rule of Three: Mass, Absorption & Decoupling

The most effective soundproofing systems in the UK use a combination of three elements:

1. **Mass:** Using heavy materials like acoustic plasterboard to block sound waves.
2. **Absorption:** Using mineral wool slabs to soak up sound energy within a cavity.
3. **Decoupling:** Using resilient bars or clips to prevent sound vibrations from travelling through the structure.

Density Matters

For internal walls, look for mineral wool with a density of at least **45kg/m³**. Standard 'loft roll' thermal insulation is too light to provide any significant sound reduction.

Fire Rating

Acoustic mineral wool slabs are typically non-combustible (Euroclass A1), providing an excellent fire barrier in addition to soundproofing benefits.

Pro Tip: Seal the Gaps

Sound is like water; it will find the smallest leak. Always use **acoustic mastic sealant** around the perimeter of your plasterboard and around any socket boxes to ensure an airtight (and sound-tight) seal.

Soundproofing & Acoustic FAQ

Technical Disclaimer

The dB reduction estimates provided are for guidance only. Actual performance depends on the existing structure, the quality of installation, and 'flanking' paths (where sound travels around the soundproofed element). For critical projects, consult a qualified acoustic engineer.