Knauf Rocksilk RS45 25mm Building Slab

The 25mm Rocksilk RS45 Knauf Rock Mineral Wool Insulation Slab is a standard-density (45kg/m3) building material, non-combustible and specially designed for versatile applications with outstanding fire performance, classified as Euroclass A1—the highest rating for non-combustible materials.

Sized at 1200mm x 600mm, this Knauf RS45 rocksilk insulation slab delivers exceptional thermal and acoustic performance for both new construction and renovation projects.

These slabs are odourless, non-hygroscopic, and rot-proof, containing no CFCs or HCFCs, and resist the growth of fungi, mould, or bacteria.

The 25mm Knauf RS45 unfaced insulation slab features a certified thermal conductivity (λ - lambda value) of 0.035W/mK for high efficiency.

With a density of 45kg/m3, this 25mm RS45 insulation slab works well for many applications, including internal partitions, timber and metal studs, and placement between timber rafters and floor joists.

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

Installation is straightforward—simply cut and shape using a large-bladed knife or saw. 25mm Knauf Rocksilk RS45 insulation slab is practical and easy to work with.

Product specification

• Brand: Knauf®
• Model: 25mm Rocksilk RS45
• Thickness: 25mm
• Length: 1200mm
• Width: 600mm
• Dimensions: 1,200mm x 600mm x 25mm
• Board Coverage: 0.72m2
• Pack Coverage: 14.40m2
• Pack Quantity: 20
• R-Value: 0.70m2K/W
• Thermal Conductivity: 0.035W/mK
• Density: 45kg/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 flexible products suited to many applications, including pitched roof constructions between rafters, intermediate floors, separating floors, internal stud partitions, and light steel frame infill. These slabs are widely used in OEM (Original Equipment Manufacturer) applications for creating thermal, acoustic, and fire products. Thanks to their non-combustible nature, Rocksilk® Building Slabs come in a range of densities from 45kg/m3 up to 140kg/m3, meeting the needs of many different applications.

Benefits

• One slab type handles multiple applications effectively.
• Factory-applied foil or tissue facing options are available, opening up solutions for a wide range of applications.
• Made from mineral wool, it provides superior sound absorption and reduction compared to other mainstream insulants.
• Built from rock mineral wool with a melting temperature exceeding 1000°C, delivering extended fire resistance compared to many other common insulants.

Info

Browse our Knauf Insulation range and filter by thickness or coverage on the left-hand side of the page. For advice on product suitability for your project or to request a quantity discount quotation, contact us by phone on +4402038839057, email sales@insulationbee, or use Live Chat for the best UK Knauf Loft Insulation prices.