Knauf Rocksilk RS45 Rock Mineral Wool Acoustic and Thermal Insulation Slab

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Brand: Knauf Insulation
Country of Manufacture: United Kingdom
In Stock

Product Size: 1200mm x 600mm

Product Code: KFRS4
£26.14 (ex VAT)
£31.37 (incl VAT)
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Earthwool Knauf RS45 building slabs are made with a unique, eco-friendly and sustainable ECOSE technology. They offer excellent acoustic and thermal insulation. These non-combustible slabs can be used in any type of structure, whether commercial or residential. Ther thermal and acoustic insulation slabs have versatile applications. They can be used across projects, as the insulation slabs are manufactured in varying densities.

The thermal and acoustic insulation slabs by Knauf are manufactured in a range of densities and can be used in a variety of applications and specifications. The insulation slabs are lightweight, easy to cut and install. They are moisture-resistant, rot-proof and odourless. They do not support the growth of moulds, fungi, vermin or other organisms.

Product Specification:

  • Length: 1200 mm
  • Width: 600 mm


Sheets in a pack

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Key Features:

  • Insulation slabs provide excellent thermal and acoustic insulation.
  • Excellent soundproofing abilities enable the product to achieve high degrees of sound reduction. Lightweight, easy to use slabs that have versatile applications.
  • Non-combustible A1 Euroclass Reaction to Fire classification.
  • Available in a variety of densities to allow flexible use across projects. 
  • Manufactured using ECOSE technology.
  • The Knauf Insulation slabs have many applications. They are perfectly suited for a wide range of specifications, uses, and performance needs.
  • Non-hygroscopic, odourless and rot-proof slabs.
  • They can be easily cut to the desired size, with a knife or saw.


  • Knauf’s rocksilk provides excellent floor insulation. They offer excellent insulation to ground floors, internal floors and separating floors.
  • They can also be used to provide exceptional internal wall insulation. Can be used to insulate partitions, Timber frame walls, light steel frame walls
  • They are also ideal for pitched roof insulation at rafter levels and fabrication. 

Product Details:

  • Material: Rock mineral wool.
  • Thermal Conductivity : 0.034 -0.035 W/mK
  • Thermal Resistance: 1.45m2K/W
  • Surface Spread of Flame: Class 1
  • Vapour Resistivity: 5.00 MN.s/g.m


  • A1 Euroclass Fire Rating
  • Eurofins Gold
  • CE Marking
  • Green Guide Rating A+


  • Knauf Rocksilk45 is made using eco-friendly ECOSE technology.
  • These slabs are free of CFCs, HCFCs, and other elements that could deplete the ozone layer. They have no ODP, thus making it more environmentally friendly.
Average Customer Rating
Overall 5.0

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