75mm Rockwool RW3 Acoustic Sound Insulation Slab (4.32m2/Pack)

URN: 3002239

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£40.22ex. VAT £9.31 per m2
£40.22ex. VAT £9.31 per m2
15+ packs 25+ packs 40+ packs
£39.83ex. VAT £39.61ex. VAT £39.40ex. VAT

In need of some peace and quiet? Restore a little sanity to your household with Rockwool RW3 75mm slabs. These resin-bonded rock mineral wool slabs are purposed to quell unwanted sounds and prevent voice leaks in your home, helping you to live in sweet, manufactured silence. Not only do these premium-quality semi-rigid slabs excel in their soundproofing abilities but they also offer maximum fire protection with an A1 rating (non-combustible) on the Euroclass scale.

With a thermal conductivity of 0.034 W/mK, you can rest easy knowing they are working on protecting the thermal envelope of your home. RW3 is a robust acoustic, thermal and fire insulation suitable for a range of general building projects as well as specialist specifications such as commercial, leisure, industrial buildings and more.

Select Thickness

Nationwide Delivery

Mon 17 Oct

Product Overview

In need of some peace and quiet? Restore a little sanity to your household with Rockwool RW3 75mm slabs. These resin-bonded rock mineral wool slabs are purposed to quell unwanted sounds and prevent voice leaks in your home, helping you to live in sweet, manufactured silence. Not only do these premium-quality semi-rigid slabs excel in their soundproofing abilities but they also offer maximum fire protection with an A1 rating (non-combustible) on the Euroclass scale.

With a thermal conductivity of 0.034 W/mK, you can rest easy knowing they are working on protecting the thermal envelope of your home. RW3 is a robust acoustic, thermal and fire insulation suitable for a range of general building projects as well as specialist specifications such as commercial, leisure, industrial buildings and more.

75mm Rockwool RW3 Acoustic Sound Insulation Slab (4.32m2/Pack)

URN: 3002239
£40.22ex. VAT

Delivery Policy

All delivery charges are shown in your basket and are dependent on the total value of the items in your basket. Our standard delivery charges for Instant Purchases are outlined below:

ORDER VALUE DELIVERY CHARGE
Insulation and Plasterboard & Drylining Products
Under £150 £75
Between £150 - £300 £50
Between £300 - £500 £25
Over £500 FREE
Building Material Products
Under £300 £50
Between £300 – £500 £25
Over £500 FREE
SuperFOIL products
Each item £10
Over £350 of these items FREE
Free Delivery Products
All FREE

Note: Values/Charges ex VAT

This charge is based on delivery to England. If your delivery address is in Scotland or Wales, a member of our customer service team will contact you prior to processing your order should an additional delivery charge apply. We do not offer deliveries outside the UK mainland.

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Key Features

  • Use in ceilings, walls and floors
  • A1 non-combustible
  • 60kg/m3 density
  • Excellent thermal and acoustic performance
  • 600mm width to fit between studwork
  • Zero Ozone Depletion Potential (ODP)

Technical Specification

Technical Specification
Material Type:Rock Mineral
Thickness:75mm
Width:600mm
Length:1200mm
Pieces Per Pack:6
Sales Unit:Pack
Sales Unit Coverage:4.32m2
Brand:Rockwool
Manufacturer's Reference:181185
Thermal Conductivity:0.034W/mK
Density:60kg/m3
Fire Rating:A1 Non-Combustible

Product Description

75mm Rockwool RW3 Acoustic Sound Insulation Slab Applications


Rockwool is one of the leading manufacturers of rock mineral wool insulation designed to impede sound transmission between rooms. Rock mineral wool offers excellent acoustic and thermal insulation properties. These 1200mm x 600mm semi-rigid Rockwool slabs are a multi-use solution perfect for general building applications - including ceilings, partition walls, and floors - as well as specialist specifications. 

The slabs can be used for the following construction types:

  • Interior timber or steel partition walls
  • Interior timber frame floors
  • Interior timber frame ceilings
  • Acoustic ceilings and partition panels
  • I-joist interior partitions
  • Party walls


Rockwool RW3 Slabs Specifications

Rockwool RW3 insulation slab 75mm is a durable insulation solution that offers fantastic thermal, acoustic and fire performance; with the ability to maintain high performance over the lifetime of your build.


The slabs come in a pack quantity of 6 per pack, giving a pack coverage of (4.32m2/Pack). 

Let's have a look at the specs:

  • Low Global Warming Potential (GWP) and Zero Ozone Depleting Potential (ODP)
  • Rot-resistant - withstands mould and mildew
  • Thermal conductivity of 0.034 W/mK
  • Water repellent qualities of the insulation prevent moisture build up, dampness and rot
  • Excellent acoustic and thermal performance
  • Fire resistance
  • Density of 60kg/m3 per slab


Rockwool 75mm RW3 Certifications

BS EN is British and European Standard Specifications. With over 100 years of experience, the British Standards Institute is recognised as the UK’s National standards body. BS EN considers Rockwool both:

  • Euroclass A1 non-combustible in accordance with BS EN 13501-1 - achieving the highest possible level of fire performance
  • CE and Key marked in accordance with BS EN 13162:2012 + A1:2015.v



75mm Rockwool RW3 slabs are also certified by Lloyd's register of shipping as non-combustible materials for use on:

  • Fixed offshore installations
  • MED classed ships- DTLR MCA approval
  • Rated non-combustible in accordance with ISO 1182 and IMO A. 799


Rockwool Insulation RW3 Storage & Handling

RW3 75mm slabs have a soft, fibrous texture, very similar to a loaf of bread. Because of this, a serrated blade is all you need to slice through it.
When it comes to storage, we advise that you store the slabs inside; keeping them nice and dry.

About Rockwool

Rockwool is recognised as being the market-leading acoustic insulation solution. The Rockwool RW slab range offers outstanding thermal, acoustic and fire insulation properties as well as lifelong durability. RW3 insulation slabs achieve Lambda 0.034 W/mK and are available in eight standard thicknesses from 25-100mm, with a density of 60 kg/m3.

Rockwool manufactures RW3 insulation with no facing as standard, but it also makes it with non-woven mineral black tissue (60gsm), non-woven mineral white tissue (100gsm), and aluminium foil.

We recommend slabs with aluminium foil facings for people who want superior sound-deadening insulation that will protect their homes for years to come.

Rockwool RW3 75mm Acoustic Performance

These slabs have a density of 60kg/m3 per slab. The denser the material, the more layers that sound vibrations have to travel through. Rock is a naturally poor conductor of sound. RW3 is the perfect choice for people who want to insulate their homes against unwanted noise. Rockwool respectfully thrashes competitor brands with its prevention of noise transmission from room to room, making it ideal for installation in internal and separating walls. 
Rockwool RW slabs work in two distinct ways to dampen sound, either by impeding the transmission of sound through an element of the structure or by absorption of sound at the surface.

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