Knauf Rocksilk RS100 25mm Building Slab

The 25mm Rocksilk RS100 Knauf Rock Mineral Wool Insulation Slab is a standard-density (100kg/m3) building material that's non-combustible and engineered for diverse applications with outstanding fire performance, achieving Euroclass A1—the highest rating for non-combustible materials.

Sized at 1200mm x 600mm, the Knauf RS100 rocksilk insulation slab delivers exceptional thermal and acoustic performance suitable for both new builds and refurbishment work.

These slabs are odourless, non-hygroscopic, and rot-resistant, containing no CFCs or HCFCs, and won't support the growth of fungi, mould, or bacteria.

The 25mm Knauf RS100 unfaced insulation slab features a certified thermal conductivity (λ - lambda value) of 0.034W/mK for reliable thermal efficiency.

With a density of 100kg/m3, the 25mm RS100 slab works well for various uses, such as internal partitions, timber and metal stud work, and fitting between timber rafters and floor joists.

The 25mm Knauf building slabs provide excellent sound absorption properties, delivering significant sound reduction benefits.

Installation is straightforward—simply cut and shape using a large-bladed knife or saw, making 25mm Knauf Rocksilk RS100 insulation slab practical to fit.

Product specification

• Brand: Knauf®
• Model: 25mm Rocksilk RS100
• Thickness: 25mm
• Length: 1200mm
• Width: 600mm
• Dimensions: 1,200mm x 600mm x 25mm
• Board Coverage: 0.72m2
• Pack Coverage: 8.64m2
• Pack Quantity: 12
• R-Value: 0.70m2K/W
• Thermal Conductivity: 0.034W/mK
• Density: 100kg/m3
• Colour: Brown
• Material: Rock mineral wool
• Fire Classification: Euroclass A1
• Vapour Resistivity: 5.00MNs/g.m.
• Fire Reaction: Non-combustible
• Building Regulations: Class '0'
• Finish: Unfaced
• Shipping method: Articulated Vehicle ǀ Courier
• Applications: Floor ǀ Wall ǀ Roof ǀ Partitions
• Foil faced: No
• ECOSE Technology: Yes
• ETA Notification: Yes
• Features: Thermal and Acoustic Insulation Performance
• Manufacturer: Knauf Rocksilk®

Made to order Facings

For a factory applied foil or tissue facing please request a quotation using the website form or by calling our agents. We do offer single side or double side foil/tissue facings.

Applications

25mm Rocksilk Building Slabs are versatile products suited to many applications, including pitched roof construction between rafters, intermediate floors, separating floors, internal stud partitions, and light steel frame infill. Commonly used in OEM (Original Equipment Manufacturer) applications for creating thermal, acoustic, and fire-rated products, these slabs benefit from non-combustibility. Rocksilk® Building Slabs come in a range of densities from 45kg/m3 up to 140kg/m3, meeting requirements across numerous applications.

Benefits

• One slab type serves multiple applications.
• Factory-applied foil or tissue facing options are available, opening up solutions for a wide range of uses.
• Made from mineral wool, it provides superior sound absorption and noise control compared to other common insulants.
• Manufactured from rock mineral wool with a melting point above 1000°C, delivering extended fire resistance performance compared to many alternative insulants.

Info

Browse our Knauf Insulation range and use the left-hand filters to narrow by thickness or coverage. For advice on product suitability for your project or to request a bulk discount quotation, contact us on +4402038839057, email sales@insulationbee or use Live Chat - Best UK Knauf Loft Insulation Prices.