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Order by Wednesday 18th December for delivery before Christmas. We will close for Christmas on Monday 23rd and reopen on Thursday 2nd Jan.
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Rockwool RW3 Acoustic Mineral Wool - 60kg/m3

Original price £38.95 - Original price £43.95
Original price
£38.95
£38.95 - £43.95
Current price £38.95

Order by Wednesday 18th December to guarantee delivery before Christmas. We will close for Christmas on Monday 23rd and will reopen on Thursday 2nd Jan.
🛠️ Minimum Order Value

This product is from our Building Materials range, which have a minimum order value of £140. View our Building Materials range to browse all the qualifying products.


  • 1200mm x 600mm 60kg density mineral wool slabs

  • Reducing the passage of airborne sound

  • Specifically designed to be more efficient than many alternative methods

Non-flammable and chemically inert high density wool specifically designed to combat noise.

The Rockwool RW3 Acoustic Mineral Wool is a premium, high-density insulation solution engineered for optimal soundproofing, thermal insulation, and fire resistance. With a density of 60kg/m³, RW3 excels in reducing airborne and reverberant noise, making it an ideal choice for soundproofing and insulation in a variety of applications, from residential and commercial buildings to industrial and maritime settings. This durable, non-combustible mineral wool is a robust performer, designed to maintain its effectiveness for the lifetime of the building.

What is the Rockwool RW3 Acoustic Mineral Wool?

The Rockwool RW3 Acoustic Mineral Wool is a high-performance, resin-bonded mineral wool slab specifically designed for acoustic insulation, thermal efficiency, and fire safety. It is composed of dense fibres that absorb sound waves, reduce heat transfer, and prevent the spread of fire. Key specifications include:

  • Density: 60kg/m³
  • Slab Size: 1200mm x 600mm
  • Thickness: Available in various options from 25mm to 100mm
  • Fire Rating: Euroclass A1 non-combustible as per EN 13501-1

RW3 is widely recognised for its versatility and is frequently used in partition walls, ceilings, floors, and roofs for acoustic and thermal performance.

How Does the Rockwool RW3 Acoustic Mineral Wool Work?

The Rockwool RW3 works by utilising its dense fibre structure to:

  1. Absorb Sound:
    • The tightly packed fibres trap and absorb airborne sound waves, significantly reducing noise transmission through voids, walls, floors, and ceilings.
    • Its density ensures effective reduction of reverberant noise, making it ideal for soundproofing applications.
  2. Thermal Insulation:
    • The dense structure minimises heat transfer, improving energy efficiency and maintaining a comfortable indoor temperature.
  3. Fire Resistance:
    • As a Euroclass A1 non-combustible material, it provides exceptional fire resistance, helping to compartmentalise spaces and prevent the spread of flames.
  4. Moisture Resistance:
    • The random fibre arrangement makes it water-repellent, preventing damp, rot, and mould growth.

How Effective is the Rockwool RW3 Acoustic Mineral Wool at Stopping Nuisance Noise?

The Rockwool RW3 provides exceptional noise reduction capabilities:

  • Airborne Noise Reduction:
    • Reduces airborne noise by up to 4-5dB when installed in floor/ceiling joists.
  • Reverberant Noise Reduction:
    • Reduces reverberant noise by up to 10dB in ceiling constructions, improving sound clarity and comfort.
  • Superior Acoustic Performance:
    • Its high density ensures better performance compared to lightweight insulation, such as loft rolls, which lack sufficient mass to block sound effectively.

Where Can the Rockwool RW3 Acoustic Mineral Wool Be Used?

The versatility of the Rockwool RW3 makes it suitable for a wide range of applications:

  1. Residential:
    • Partition walls, floors, and ceilings for soundproofing and thermal insulation.
  2. Commercial:
    • Offices, schools, and healthcare facilities for controlling noise levels and improving energy efficiency.
  3. Industrial:
    • Acoustic panels, machinery enclosures, and other high-noise environments.
  4. Specialist Applications:
    • Ships, offshore platforms, and fixed installations requiring non-combustible certification.
  5. BREEAM Projects:
    • Its eco-friendly design makes it an ideal choice for sustainable construction.

How to Install the Rockwool RW3 Acoustic Mineral Wool

Installing Rockwool RW3 is straightforward and efficient:

  1. Preparation:
    • Measure and cut the slabs to fit the specific space using a serrated knife.
    • Ensure the surface is clean, dry, and free of debris.
  2. Placement:
    • Place the slabs between joists, studs, or in ceiling voids.
    • For optimal performance, fill voids completely to prevent gaps.
  3. Fixing:
    • No additional fixings are required as the slabs are self-supporting.
    • For ceilings, use resilient bars or acoustic plasterboards for enhanced performance.
  4. Finishing:
    • Cover the slabs with suitable facing layers, such as drywall or acoustic boards, to complete the soundproofing system.

What Are the Benefits of Using the Rockwool RW3 Acoustic Mineral Wool?

  1. Superior Acoustic Insulation:
    • Effectively reduces airborne and reverberant noise, creating quieter, more comfortable spaces.
  2. Fire Resistance:
    • Euroclass A1 non-combustibility ensures the highest level of fire safety.
  3. Thermal Efficiency:
    • Reduces heat transfer, improving energy efficiency and reducing utility costs.
  4. Moisture Resistance:
    • Prevents damp, rot, and mould, ensuring long-term performance.
  5. Eco-Friendly:
    • Made from sustainable materials and fully recyclable with no Ozone Depleting Potential (ODP).
  6. Durability:
    • Maintains performance over the building’s lifetime without requiring maintenance.
  7. Versatility:
    • Suitable for residential, commercial, industrial, and specialist applications.
  8. Ease of Installation:
    • Lightweight and easy to handle, making installation quick and straightforward.
  9. Cost-Effective:
    • Offers excellent performance at a competitive price point, making it an ideal choice for budget-conscious projects.

By choosing Rockwool RW3 Acoustic Mineral Wool, you invest in a reliable, high-performance solution for soundproofing, insulation, and fire safety in any building project.

Here are the main details for this product:

Dimensions:

1200mm x 600mm

Thickness: 50mm / 75mm / 100mm Options

Pack Size:

50mm - Pack of 8
75mm - Pack of 6
100mm - Pack of 4

Weight: TBC

Density: 60Kg

Coverage: sqm

Fire rating: Euroclass A1

Thermal Conductivity:

View Product Information Guide

Please contact our team if you have any questions on this product.

Looking for a complete soundproofing solution?

If your looking for soundproofing for a particular situation or application, then the best place to start is with our soundproofing solutions that cover walls, floors, ceilings and reducing echo. Select the relevant application below to find out more.

Wall Solutions

Floor Solutions

Ceiling Solutions

Echo Solutions


Visit our Fitting Instructions section for more detailed instructions relating to your specific application.

Check out our Soundproofing Guides for more information, advice and tips on all aspects of soundproofing.