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Knauf RS60 25mm

Performance: Will vary due to featuring in acoustic systems.

Dimensions: 1200mm x 600mm x 25mm

Weight: 20kg

For: Homes and workplaces.

Compliance: Compliant with both Part E Building Regulations (England, Wales, Northern Ireland and the Republic of Ireland).*

Installation: Will vary depending on which system it features.

Where: For all cavities found between floor joists, stud frame walls and ceilings. Also in conjunction with acoustic cradles such as MuteCradle™ 45/60mm.

Universally recognised throughout the world of soundproofing, commonly used as part of an acoustic system, or combined with additional acoustic materials such as our MuteClip®. There is currently a shortage on Rockwool RW3, RWA45, Knauf RS60 and RS45 within the UK, please do contact do office before orders so we can indicate stock availability.

More Information

Knauf RS60 Acoustic Mineral Wool 100mm

Specialist Acoustic Mineral Wool for Part E Building Regulations Compliance

Knauf Acoustic Mineral Wool (RS60) (60kg per m3) is high-density acoustic mineral wool that is used to treat the ‘open spaces’, or cavities, between flooring joists, stud-frame walls and battened ceilings. As an open-fibrous material, it helps to reduce sound energy by turning it into heat, helping to reduce cavity resonance. As a standalone product, it is only effective against very light background noise issues. We recommend Knauf Acoustic Mineral Wool to be used as part of a system when a cavity is created or existing.

Acoustic Mineral Wool will also help to prevent Flanking Transmission adjacent open cavities. Any acoustic system fitted without this material will not achieve its full acoustic performance and may fall short of expectations or essential acoustic regulations.

Acoustic Mineral Wool has a greater density than thermal wool, and this is evident in their slab appearance. The reduction as an acoustic insulation material comes as an absorptive rating NRC (Noise Reduction Coefficient) which differs for each thickness. This means that it is an absorptive material as opposed to a dense soundproofing product. You will find all acoustic systems that Acoustic Mineral Wool is featured in by selecting the ‘Systems’ tab above. Here you will see how vital it is!


A crucial component for all soundproofing systems with joists, battens, acoustic cradles or stud-frames.
To be used in cavities to provide optimum soundproofing performance for all systems
Slab dimensions 1200mm x 600mm x 30mm (18 per bale – 12.96m2)
Other thicknesses include: 100mm, 75mm and 50mm
Euroclass A1 fire rating
Always leave an air gap to ensure full performance a minimum of 10mm
A 3-5 day lead time can be expected with this product, please call ahead for availability

Knauf RS60 Pack Quantities

4 Slabs (2.88m2)
6 Slabs (4.32m2)
9 Slabs (6.48m2)
18 Slabs (12.96m2)

60kg is not its surface density, but the density of the product when measured in cubic meters, it is a fairly lightweight sound insulation material which is easy to cut and fit.
The 25mm thickness is the thinnest dense slab available and is used to help insulate small cavities, for using with ‘boxing in’ pipes with our MuteWrap and used with our MuteClip® direct to brick or block wall constructions where a small air gap is created. Do not compress Acoustic Mineral Wool between the sound source and soundproofed surface as this creates a direct path for sound to travel through, this will degrade the performance of the soundproofing system.
You will want to install Acoustic Mineral Wool in conjunction with dense soundproofing materials, and it is essential to note that as a lightweight, fibrous material, the sound will pass through it and that its prime function is to reduce noise reverberating around an empty cavity and not as a standalone to reduce noise transfer between rooms.
Acoustic Mineral Wool is a fibrous material, which means that fibres are released into the air when exposed and why it is usually used in a cavity or covered. It is not recommended to use as exposed panelling. We offer a vast range of sound absorption materials we tailor to your creative imagination with a variety of colours, as well as stock items in a range of designs and colours.
We have found that a bread knife usually makes for an excellent cutting tool if this is unavailable – a large pair of scissors will also work well.
There are no dangerous properties found in Acoustic Mineral Wool, but as it is fibrous it can give a slight irritation to the skin. Those with sensitive skin may experience itching, so we recommend the use of gloves and protective eye-wear. This will be the case for all mineral wool insulation.

Installation Guide

Acoustic Mineral Wool is not listed as a toxic or hazardous material, but when installing it does release small dust particles, so we recommend the use of gloves, eye protection and protective mask.

Measure the depth of the cavity first, or if you know the stud depth you are using, make sure that you choose a depth of Acoustic Mineral Wool that allows for a 10mm air gap on either side.

The reason you leave this air gap is to avoid compressing the fibrous properties between the two partitions you are soundproofing, for example, do not use a 100mm depth in a 50mm gap.

Acoustic Mineral Wool is easy to cut with large scissors, or we found a bread knife to be a great tool here.

Cut the slab a little larger than the stud or joist gap to friction hold, or use a form of wiring to hold it in place.

Sound insulation advice for Part E

Soundproofing Floors
Soundproofing Floors
Soundproofing Designs for Party Floors to achieve compliance with Part E of the Building Regulations.
Soundproofing Walls

Soundproofing Walls

Soundproofing Designs for Party Walls to achieve compliance with Part E of the Building Regulations.

Related Products

Rockwool RW3 50mm
Rockwool RW3 100mm
Knauf RS60 50mm
Knauf RS60 100mm

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