50mm Knauf Rocksilk Flexible Insulation Slab

The 50mm Rocksilk Flexible Slab is a premium Rock Mineral Wool slab engineered to deliver comprehensive thermal and acoustic performance across diverse construction applications, with exceptional fire safety credentials for loft conversion floors. Extensive testing confirms this 50mm Knauf Flexible Insulation Slab achieves 60 minutes of fire resistance when installed in loft conversion floor settings.

This product is entirely non-combustible and carries the highest Euroclass A1 fire classification, delivering superior fire safety assurance. The manufacturing process utilises Knauf Insulation's proprietary ECOSE® Technology binder, formulated from renewable materials for environmental responsibility.

Product Specification

Thickness: 50mm

Length: 1200mm

Width: 600mm

Coverage: 8.64m2

Brand: Knauf Flexi

R-Value: 1.35m2K/W

Thermal Conductivity: 0.035 and 0.037 W/mK

Model: 50mm Flexible

Dimensions: 1,200mm x 600mm x 50mm

Density: 33kg/m3

Material: Rock Mineral Wool

Profile: Flexible on all four sides

Vapour Resistivity: 5.00MNs/g.m.

Building Regulations: Class '0'

Fire performance: Euroclass A1 (non-combustible)

Finish: Unfaced

Applications: Partitions, walls, floors, ceilings , loft insulation

ECOSE Technology: Yes

Features: Non-combustible ǀ Versatile

Application

This 50mm Knauf Flexi insulation slab performs effectively across multiple construction scenarios, including ground floors, internal floors, separating floors, pitched roofs at rafter level, internal walls and partitions, light steel frame walls, and timber frame walls. Its versatility makes it an excellent solution for varied construction projects, delivering consistent thermal and acoustic performance in every application.

Benefits

A highly adaptable product suited to insulating numerous on-site applications. This 50mm Knauf multi-purpose solution features flexibility across all four sides, enabling rapid and straightforward installation. For loft insulation projects, existing ceiling structures can remain in place whilst maintaining full building regulation compliance.

Regarding fire resistance, comprehensive testing to EN 1365 has been performed at both 400mm and 600mm thicknesses. Testing results show this product delivers one hour of fire resistance in separating floor applications. These outstanding fire safety attributes ensure your construction project satisfies the most demanding safety requirements.

Durability

The 50mm Knauf Rocksilk Flexible Slab remains odourless, rot-resistant, non-hygroscopic, resists vermin infestation and prevents fungal, mould and bacterial growth. This product will maintain its performance throughout the lifespan of the building structure.

Info

Browse our complete Knauf range and refine by thickness or coverage using the filters on the left side. For guidance on product suitability for your project or bulk discount quotations, contact us on +4402038839057 , email sales@insulationbee or use Live Chat - Lowest UK Insulation Prices.