Knauf Rocksilk RS100 40mm Building Slab

The 40mm 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 excellent fire performance, achieving Euroclass A1—the highest standard for non-combustible products.

With dimensions of 1200mm x 600mm, the Knauf RS100 rocksilk insulation slab delivers outstanding thermal and acoustic performance suitable for both new builds and refurbishment work.

These slabs are odourless, non-hygroscopic, and rot-resistant, manufactured without CFCs or HCFCs, and resist fungal, mould, and bacterial growth.

The 40mm 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 40mm RS100 slab works well for many uses, such as internal partitions, timber and metal stud work, and fitting between timber rafters and floor joists.

40mm Knauf building slabs provide excellent sound absorption qualities, delivering significant sound reduction benefits.

Installation is straightforward—simply cut and shape using a large-bladed knife or saw, making 40mm Knauf Rocksilk RS100 insulation slab practical and user-friendly.

Product specification

• Brand: Knauf®
• Model: 40mm Rocksilk RS100
• Thickness: 40mm
• Length: 1200mm
• Width: 600mm
• Dimensions: 1,200mm x 600mm x 40mm
• Board Coverage: 0.72m2
• Pack Coverage: 5.04m2
• Pack Quantity: 7
• R-Value: 1.15m2K/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

40mm Rocksilk Building Slabs are flexible solutions suitable for many different uses, including pitched roof installations between rafters, intermediate floors, floor separations, internal stud partitions, and light steel frame infill. These slabs are commonly used in OEM (Original Equipment Manufacturer) applications for producing thermal, acoustic, and fire-rated products. Being non-combustible, Rocksilk® Building Slabs come in various densities ranging from 45kg/m3 to 140kg/m3, meeting the needs of many different projects.

Benefits

• One slab type handles multiple applications across your project.
• Factory-applied foil or tissue facing options are available, offering flexibility for a wide range of uses.
• Rock mineral wool construction provides superior sound absorption and noise reduction compared to many other insulation products.
• Made from rock mineral wool with a melting point above 1000°C, delivering extended fire resistance performance compared to standard alternatives.

Info

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