40mm Knauf Rocksilk Flexible Insulation Slab

The 40mm Rocksilk Flexible Slab is a high-performance Rock Mineral Wool slab engineered to deliver superior thermal and acoustic performance alongside exceptional fire protection for loft conversion floors. Extensive testing confirms that 40mm Knauf Flexible Insulation Slab achieves 60 minutes of fire resistance when installed in loft conversion floor applications.

This product is non-combustible and carries the highest Euroclass A1 reaction to fire rating, delivering premium fire safety assurance. The manufacturing incorporates Knauf Insulation's advanced ECOSE® Technology binder, which is sustainably sourced from renewable materials.

Product Specification

Thickness: 40mm

Length: 1200mm

Width: 600mm

Coverage: 10.080m2

Brand: Knauf Flexi

R-Value: 1.05m2K/W

Thermal Conductivity: 0.035 and 0.037 W/mK

Model: 40mm 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 40mm Knauf Flexi insulation slab suits a broad spectrum of 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. The product's inherent flexibility makes it an excellent choice for diverse construction scenarios, delivering dependable thermal and acoustic performance across all applications.

Benefits

A versatile solution for insulating multiple applications on-site. This 40mm Knauf multi-purpose product features flexibility across all four sides, enabling quick and straightforward installation. For loft insulation projects, existing ceiling structures can remain in place whilst maintaining full building regulation compliance.

Regarding fire resistance, testing to EN 1365 has been completed at both 400mm and 600mm thicknesses. Performance data shows this product delivers one hour of fire resistance in separating floor applications. These outstanding fire safety properties ensure your construction project satisfies the most demanding safety requirements.

Durability

40mm Knauf Rocksilk Flexible Slab is odourless, rot proof, non-hygroscopic, resists vermin infestation and will not support fungal, mould or bacterial growth. The product's lifespan matches that of the building structure it is installed within.

Info

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