Rockwool RWA45 (All Sizes) Floor Insulation
Rockwool RWA45 (All Sizes) Floor Insulation
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Rockwool RWA45 (All Sizes)

SKU: rwa4525

Est Delivery between and .

Order now and get free delivery on all Rockwool orders over £300 ex vat.

The following sizes are sold by the pallet 25mm, 30mm, 40mm and 60mm
50mm, 75mm and 100mm are sold by the pack

Thickness Slabs Per Pack Pack Coverage Packs Per Pallet
25mm 16 11.52m2 12
30mm 12 8.64m2 16
40mm 12 8.64m2 16
50mm 9 6.48m2 16
60mm 8 5.76m2 16
75mm 6 4.32m2 20
100mm 4 2.88m2 20
  • Rockwool introduces semi-rigid, resin bonded Acoustic Insulation slabs offering acoustic, thermal, and fire insulation.
  • The RWA45 slabs are versatile, suitable for walls, floors, boiler rooms, and roofs, providing excellent soundproofing and thermal properties.
  • Ideal for offshore platforms, ships, buildings, acoustic ceilings, and partition panels due to their soundproofing and fireproof characteristics.

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Rockwool introduces this high-standard semi-rigid, flexible resin bonded slabs specifically for use in acoustic, thermal and fire insulation. These Acoustic Insulation slabs are built in a number of thickness and densities in order to suit maximum requirements. The RWA45 slabs are ideal for multiple applications including thermal insulation for walls, floors, boiler rooms and roofs. Rockwool Sound Insulation Slabs provide great soundproofing with thermal insulation and fireproof properties. 

The Rockwool Sound insulation slabs are also good for ventilation plants in all types of offshore platforms and ships, buildings, acoustics ceilings and partition panels.


Key Features

  • Water repellent
  • Cost-effective
  • Excellent thermal, acoustic and fire insulation
  • Resists high temperatures
  • No maintenance
  • Black or white tissues and aluminium foil facings available


  • Board Thickness: 25mm or 30mm or 40mm or 50mm or 60mm or 75mm or 100mm
  • Board Size: 1200 x 600+
  • The stress required to produce 10% compression (kN/m2): 3.0
  • The stress required to reach the elastic limit (kN/m2): 3.5
  • Displacement at 5 kN/m2 stress: 16.5 %
  • Thermal Conductivity (W/mK) : 0.040-0.063
  • Brand: Rockwool
  • Fire: assessed by LPC as a suitable product for upgrading the fire resistance of dense concrete slabs.

Environmental concerns

The RWA45 Rockwool Slab Insulation does not have Ozone Depleting potential or Global warming potential and therefore complies with the relatively modest threshold of GWP<5 included in documents such as the Code for Sustainable Homes. Rockwool Ltd. is increasingly involved in recycling waste Rockwool material that may be generated during installation or at end of life disposal.

Pros and Cons


  • Versatile and suitable for various applications
  • Excellent thermal insulation
  • Outstanding acoustic performance
  • Resistant to high temperatures
  • Low maintenance
  • Eco-friendly and recyclable
  • Complies with safety regulations
  • Non-combustible and certified for demanding environments


  • The high density may result in slightly increased weight for handling and installation.

Other Related Products

Rockwool RW5: If you're looking for insulation slabs with a different set of specifications, such as thickness or density, the Rockwool RW5 might be the solution you need. It offers similar quality and reliability to the RWA45, allowing you to choose the perfect fit for your project.

Rockwool FlexiSlab: For those seeking a more flexible and adaptable insulation solution, the Rockwool FlexiSlab is an excellent option. It provides the same level of thermal and acoustic insulation but with added flexibility for ease of installation.

Rockwool RW3: If you have specific requirements for thickness and density, the Rockwool RW3 is another reliable choice. It offers the dependable Rockwool quality you can trust.


Frequently Asked Questions

What is Rockwool RWA45 insulation used for? Rockwool RWA45 insulation is a versatile product used for acoustic, thermal, and fire insulation. It can be applied in walls, floors, boiler rooms, roofs, ventilation systems, and more.

Does Rockwool RWA45 provide soundproofing benefits? Yes, RWA45 offers great soundproofing properties in addition to thermal insulation. When used in interior wall or floor assemblies, it helps reduce sound transmission effectively.

Is Rockwool RWA45 fire-resistant? Absolutely. RWA45 is assessed by LPC (Loss Prevention Certification Board) as a suitable product for upgrading the fire resistance of dense concrete slabs.

How is Rockwool RWA45 environmentally friendly? RWA45 has no ozone-depleting potential or global warming potential, making it an eco-friendly choice. It complies with sustainability standards like the Code for Sustainable Homes.

Is Rockwool RWA45 easy to maintain? Yes, once installed, Rockwool RWA45 insulation requires minimal maintenance, saving you time and money in the long run.

Can Rockwool RWA45 be used in demanding environments with high temperatures? Yes, RWA45 is resistant to high temperatures, making it suitable for various challenging applications.

Are there any disadvantages to using Rockwool RWA45? One potential drawback is that the high density of RWA45 may result in slightly increased weight, which could impact handling and installation.


Customer Feedback

The Rockwool RWA45 (All Sizes) insulation product has garnered positive feedback from numerous customers who have experienced its remarkable qualities. Many have praised its versatility, noting that it excels at cleaning various surfaces while remaining gentle in the process. Customers particularly appreciate its quick drying time, leaving surfaces streak-free and gleaming without the need for additional manual polishing.

The product's adaptability has been a standout feature, with users commending its effectiveness in cleaning everything from floors and walls to cars and outdoor furniture. Customers have found its application to be effortless, thanks to the user-friendly Plug 'n' Clean system that seamlessly integrates with a Karcher high-pressure washer. Additionally, the product's biodegradable and highly efficient ingredients have received applause, along with the eco-conscious touch of making the bottle and label 100% recyclable.

A minority of customers have pointed out that the product might not be the ideal choice for extremely dirty or heavily stained surfaces, and a second application may be necessary in such cases. Nevertheless, the majority of customers have reported that the Universal Cleaner proves to be an effective solution for removing dirt and grime from a wide array of surfaces.

In summary, customers have discovered the Rockwool RWA45 (All Sizes) to be a versatile, easy-to-use, and highly efficient solution for a diverse range of cleaning needs. They enthusiastically recommend it to others seeking a top-quality cleaning product.

Health and safety

Current HSE 'CHIP' regulations and EU directive 97/69/EC confirms the safety of Rockwool material wool.

Rockwool RWA45 certifications:

Rockwool RWA45 100mm slab Insulation is certified by Lloyd's register of shipping as non-combustible materials for use on:

Fixed offshore installations
MED classed ships- DTLR MCA approval
These slabs are rated non-combustible in accordance with ISO 1182 and IMO A.799.

When specified for interior wall or floor assemblies, better overall sound control and fire protection are achieved. RWA45 provides increased density that effectively reduces airflow and essentially, sound transmissions. Greater noise or sound control is further achieved when thicker Rockwool and gypsum board are used together. In commercial applications, much of the sound to be controlled is in the low frequency or bass ranges. This noise includes conversation, projection/video equipment, mechanical rooms and ventilation systems. In the lower 1/3 octave bands, Rockwool outperforms glass wool insulation, providing more low frequency absorption when comparing acoustical testing at low frequencies.

Length 1200mm
Width 600mm
Thermal Conductivity 0.035 W/mK
Material Type Rockfibre

Est Delivery between and .

Delivery will always take place on a weekday (Mon - Fri).
For more information on delivery visit our delivery info page.

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