Knauf Rocksilk RS100 50mm Building Slab

The 50mm Rocksilk RS100 Knauf Rock Mineral Wool Insulation Slab is a standard-density (100kg/m3) building material, non-combustible and engineered for diverse applications with exceptional fire performance, achieving Euroclass A1—the highest standard for non-combustible products.

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

These slabs are odour-free, non-hygroscopic, and rot-resistant, containing no CFCs or HCFCs, and resist fungal, mould, and bacterial growth.

The 50mm Knauf RS100 unfaced insulation slab boasts a certified thermal conductivity (λ - lambda value) of 0.034W/mK for reliable thermal performance.

With a density of 100kg/m3, this 50mm RS100 slab works well across multiple settings, from internal partitions to timber and metal stud frames, and between timber rafters and floor joists.

The 50mm Knauf building slabs provide excellent sound absorption, delivering notable sound reduction benefits.

Installation is straightforward—simply cut and shape using a large-bladed knife or saw. 50mm Knauf Rocksilk RS100 insulation slab combines ease of use with reliable performance.

Product specification

• Brand: Knauf®
• Model: 50mm Rocksilk RS100
• Thickness: 50mm
• Length: 1200mm
• Width: 600mm
• Dimensions: 1,200mm x 600mm x 50mm
• Board Coverage: 0.72m2
• Pack Coverage: 4.32m2
• Pack Quantity: 6
• R-Value: 1.45m2K/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

50mm Rocksilk Building Slabs suit a wide range of uses, from pitched roof installations between rafters to intermediate floors, floor separations, internal stud partitions, and light steel frame infill. These slabs are popular in OEM (Original Equipment Manufacturer) applications for creating 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 works across multiple applications.
• Factory-applied foil or tissue facing options are available, expanding the range of suitable uses.
• Rock mineral wool construction provides superior sound absorption and noise reduction versus other common insulation materials.
• Made from rock mineral wool with a melting point above 1000°C, delivering extended fire resistance compared to many alternative insulants.

Info

Browse our full Knauf Insulation range and use the left-hand filters to sort by thickness or coverage. Need advice on product suitability for your project or a bulk discount quote? Get in touch by phone on +4402038839057, email sales@insulationbee, or use Live Chat—we offer competitive Knauf Loft Insulation pricing across the UK.