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25mm 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:16
Sales Unit:Pack
Sales Unit Coverage:11.52m2
Manufacturer's Reference:181173
Thermal Conductivity:0.035W/mK
Fire Rating:A1 Non-Combustible



25mm Rockwool RWA45 Sound Insulation Slab Applications

Rockwool RWA45 is a robust insulation solution for a range of general building projects as well as specialist specifications such as commercial, leisure, industrial and more. 25mm acoustic Rockwool insulation contains layers and layers of materials that are poor conductors of sound, making them especially perfect for use in partition walls, ceilings, floors and more.
The slabs can be used for 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


Rockwool 25mm RWA45 Specifications

Rockwool RWA45 insulation slab 25mm really delivers on thermal, acoustic and fire performance; you can be sure this multi use solution will maintain high performance over the lifetime of your build. They come in a pack quantity of 16 per pack, giving a pack coverage of (11.52m2/Pack) Let's have a look at the specs:

  • Low Global Warming Potential (GWP) and Zero Ozone Depletion Potential (ODP)
  • Rot-resistant - withstands mould and mildew
  • Thermal conductivity of 0.035 W/mK
  • Water repellent qualities of the insulation prevent moisture build up, dampness and rot
  • Excellent acoustic and thermal performance 
  • Fire resistance 


Rockwool 25mm 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:

  • 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


25mm 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 Insulation RWA45 Storage & Handling

RWA45 is a durable insulation solution which is a doddle to cut, ensuring you 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 25mm 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.

About Rockwool

Rockwool is recognised as being the market-leading acoustic insulation solution. The Rockwool RW 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. 

25mm Rockwool RWA45 Acoustic Sound Insulation Slab (11.52m2/Pack)

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