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50mm Rockwool RWA45 is a multi-application thermal, acoustic and fire insulation slab. This mineral wool insulation solution is purposed to minimise noise in a vast range of general building projects.


Key Features

  • Use in ceilings, walls and floors
  • A1 non-combustible
  • 45kg/m3 density
  • Excellent thermal and acoustic performance
  • 600mm width to fit between studwork
  • Zero Ozone Depletion Potential (ODP)


Technical Specification

Material Type:Rock Mineral
Pieces Per Pack:9
Sales Unit:Pack
Sales Unit Coverage:6.48m2
Manufacturer's Reference:181176
Thermal Conductivity:0.035W/mK
Fire Rating:A1 Non-Combustible



50mm Rockwool RWA45 Sound Insulation Slab Applications

Rockwool Insulation 50mm Slab soaks up sound like no other, making it perfect for use in walls, floors, stud partitions and lofts to control home acoustics and reduce noise.

The slabs can be used for multiple applications, including the following:

  • 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
  • Industrial applications


Rockwool 50mm RWA45 Specifications

Rockwool RWA45 insulation slab 50mm really does it all. With thermal, acoustic and fire preventative properties, you can be sure this robust insulation solution will maintain high performance over the lifetime of your build. 

They come in a pack quantity of 9 per pack, giving a pack coverage of (6.48m2/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
  • Absorbs sound waves and reduces vibration
  • Thermal conductivity of 0.035 W/mK
  • Hydrophobic - water repellent qualities of insulation prevent moisture decay and rot
  • Excellent thermal, acoustic and fire insulation
  • Resists high temperatures - able to withstand temperatures of over 1,000°C


Rockwool 50mm RWA45 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:

  • Fire classification: 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


50mm Rockwool 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 Sound Insulation Slab Storage & Handling

RWA45 is a durable insulation solution which is hassle-free when it comes to cutting so you can get the best fit possible in all situations.  The 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.

Rockwool RWA45 50mm Acoustic Performance

Rockwool thermal and acoustic insulation slab is best known for its excellent acoustic performance. 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.

Its higher density and non-directional fibre orientation trap sound waves and deaden sound vibrations like no other insulation on the market. The open-porous structure of the fibres in RWA45 slabs grants them their incredible sound-absorbing performance, with characteristically high coefficients over a wide frequency range.

About Rockwool

Rockwool is recognised as being the market-leading acoustic insulation solution. The Rockwool sound insulation slab range offers outstanding fire, acoustic and thermal insulation properties as well as lifelong durability.  The product range consists of high-quality resin bonded slabs in a variety of thicknesses and densities. 

Rockwool RW slab products, either un-faced or with an aluminium foil or glass fleece on one or both surfaces, achieve an A1 classification in accordance with BS EN 13501-1 and thus meet the requirements of non-combustible materials, as defined in UK and Ireland Building Regulations.

50mm Rockwool RWA45 Acoustic Sound Insulation Slab (6.48m2/Pack)

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