90mm Knauf Rocksilk Flexible Insulation Slab

Discover the 90mm Rocksilk Flexible Slab, a premium Rock Mineral Wool slab engineered to deliver superior thermal and acoustic performance alongside exceptional fire protection for loft conversion floors. Extensive testing confirms that the 90mm Knauf Flexible Insulation Slab achieves 60 minutes of fire resistance when installed in loft conversion floor applications.

This product delivers non-combustible performance and carries the highest Euroclass A1 reaction to fire rating, ensuring maximum fire safety compliance. The manufacturing process utilises Knauf Insulation's advanced, sustainable binder system ECOSE® Technology, sourced from renewable materials.

Product Specification

Thickness: 90mm

Length: 1200mm

Width: 600mm

Coverage: 4.32m2

Brand: Knauf Flexi

R-Value: 2.40m2K/W

Thermal Conductivity: 0.035 and 0.037 W/mK

Model: 90mm Flexible

Dimensions: 1,200mm x 600mm x 90mm

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

The 90mm Knauf Flexi insulation slab suits numerous construction applications, 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 flexibility across multiple building scenarios makes it an excellent option for diverse construction requirements, delivering consistent thermal and acoustic performance throughout.

Benefits

A highly adaptable solution for insulating numerous on-site applications, this 90mm Knauf multi-purpose product 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, rigorous testing to EN 1365 has been performed at both 400mm and 600mm thicknesses. Testing results confirm one hour of fire resistance performance in separating floor applications. These outstanding fire safety properties provide assurance that your project achieves the highest safety standards.

Durability

The 90mm Knauf Rocksilk Flexible Slab remains odourless, rot-resistant, non-hygroscopic, resists vermin colonisation and prevents fungal, mould and bacterial growth. This product maintains a service life matching that of the building structure itself.

Info

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