Acoustic Insulation

Choosing the Right Acoustic Insulation for Walls & Floors

At County Building Supplies, we supply acoustic insulation for professional builders, contractors, self-builders and DIY customers. Whether you're improving sound insulation between rooms, constructing internal partitions or upgrading floor assemblies, choosing suitable acoustic insulation can help reduce unwanted noise and improve comfort.

Our range includes Knauf Acoustic Roll, a mineral wool insulation product designed for suitable acoustic insulation applications.

How Does Acoustic Insulation Work?

Acoustic mineral wool helps absorb sound energy within wall and floor cavities, reducing resonance and contributing to improved sound insulation when used as part of a correctly designed construction.

It is commonly installed within timber or metal stud partitions and suitable floor assemblies. However, acoustic insulation alone will not soundproof a room completely. The overall performance depends on the complete system, including plasterboard, framing, cavity depth and airtightness.

Using Acoustic Insulation in Stud Walls

Acoustic insulation is often installed between studs in internal partition walls to help reduce sound transmission between rooms.

For effective installation, choose insulation suitable for the cavity dimensions and fit it without leaving unnecessary gaps. Avoid excessive compression, which can affect the product's intended performance.

Where a particular acoustic rating is required, follow a tested wall system specification rather than relying on insulation thickness alone.

Choosing Acoustic Insulation Thickness

County stocks Knauf Acoustic Roll in 100mm thickness, with approximately 12.36m² coverage per roll.

The correct thickness depends on the wall or floor construction and the available cavity depth. A thicker insulation layer does not automatically guarantee better sound reduction, as the performance of the complete building assembly is equally important.

How Much Acoustic Insulation Do You Need?

Measure the length and height of each wall, or the length and width of a floor area, to calculate the total square metres requiring insulation.

For example, a wall measuring 5m wide by 2.4m high has an area of 12m². One Knauf Acoustic Roll covering 12.36m² may provide sufficient nominal coverage, subject to the installation layout and cutting waste.

Allow additional material for awkward spaces and offcuts, and check the manufacturer's coverage information before ordering.

Need Advice?

Not sure whether acoustic insulation is suitable for your project? Visit your local County Building Supplies branch or contact our team for help with product information, quantities and availability.