Everything you want (and need) to know about acoustic insulation

RS Components

Do you work in construction, audio production, or any other industry where sound is a serious concern? Then you need to know about acoustic insulation. This specialised type of insulation is designed to reduce sound leakage between rooms and improve sound quality. You can buy acoustic insulation from any reputable seller, e.g. RS Components

Before you invest in acoustic insulation technology, there are a few things you should consider. In this article, we’ll walk you through everything you need to know about acoustic insulation—allowing you to make a more informed decision for your business.  

What is acoustic insulation made from?

The two most common materials used to create acoustic insulation are mineral wool and fibreglass.

Mineral wool, also known as rock board, is a fire-resistant and rigid material used to create thermal and acoustic insulation batts. It’s a fantastic choice for commercial and residential buildings.

Fibreglass insulation is great for improving sound quality—so it’s the ideal choice for studios and recording rooms. You’ll also find this material used frequently in theatres, churches, and commercial buildings.

Which kind of acoustic insulation should I choose?

There are a few factors you should consider when selecting your acoustic insulation, including:

  • Fire rating
  • Thickness
  • Density (kg/m³)

For most businesses, it makes sense to choose fireproof or fire-resistant insulation. Fire-rated acoustic insulation is non-flammable and unignitable and should offer temperature resistance of up to 550 degrees celsius.

In terms of thickness, you should select insulation that suits your business’s needs. For example, if you’re soundproofing timber flooring, choose acoustic insulation with a minimum thickness of 100mm.

For soundproofing walls, acoustic insulation thicknesses range from 25mm to 100mm. For stud walls, choose a thickness of at least 50mm—keeping in mind that thicker insulation will provide better soundproofing.

Now, let’s discuss density—the factor that sets acoustic insulation apart from other types. Density is measured in kg/m³, and options range from 45 to 140 kilograms per slab.

The kg/m³ measurement reflects the weight of an acoustic slab manufactured in a one-metre cubed block (1m³ or 1m x 1m x 1m).

Acoustic insulation slabs are available in densities of:

  • 140kg/m³
  • 100kg/m³
  • 80kg/m³
  • 60kg/m³
  • 45kg/m³

Slabs ranging from 100kg/m³ to 140kg/m³ offer the best sound insulation. These are the best options for studio or industrial settings.

If you’re budget-conscious, slabs ranging from 60kg/m³ to 80kg/m³ will provide quality soundproofing at a reduced cost.

Low-density slabs (45kg/m³) are best for separating floors. They’re also fantastic for tight spaces around electrical wiring or pipes.  

How do you install acoustic insulation?

To add soundproofing between your building’s walls, install acoustic insulation batts within the walls themselves. Installation is relatively simple and follows the same process as thermal insulation.

To maximise soundproofing, make sure to fill all gaps when installing your acoustic insulation.


Acoustic insulation is a fantastic option for reducing sound transfer between rooms and improving sound quality within them. With the information you now know, you’ll be able to select and install the correct type of insulation for your business.