140mm Knauf Rocksilk Flexible Insulation Slab

140mm Rocksilk Flexible Slab is a premium Rock Mineral Wool slab engineered to deliver comprehensive thermal and acoustic performance alongside superior fire protection for loft conversion floors. Extensive testing confirms that 140mm Knauf Flexible Insulation Slab achieves 60 minutes of fire resistance when deployed in loft conversion floor installations.

This product delivers non-combustible performance and carries the highest Euroclass A1 reaction to fire rating, establishing premium fire safety credentials. Manufacturing employs Knauf Insulation's advanced ECOSE® Technology binder, formulated from renewable materials for environmental responsibility.

Product Specification

Thickness: 140mm

Length: 1200mm

Width: 600mm

Coverage: 2.16m2

Brand: Knauf Flexi

R-Value: 4.0m2K/W

Thermal Conductivity: 0.035 and 0.037 W/mK

Model: 140mm Flexible

Dimensions: 1,200mm x 600mm x 140mm

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 140mm Knauf Flexi insulation slab performs effectively across ground floors, internal floors, separating floors, pitched roofs at rafter level, internal walls and partitions, light steel frame construction, and timber frame walls. Its broad compatibility makes it suitable for diverse construction scenarios, delivering consistent thermal and acoustic performance regardless of application type.

Benefits

A highly adaptable solution for insulating multiple building applications on-site. This 140mm Knauf multi-purpose product features four-sided flexibility, enabling rapid and straightforward installation procedures. For loft insulation projects, existing ceiling structures can remain in place whilst maintaining full building regulation compliance.

Regarding fire resistance, rigorous EN 1365 testing at both 400mm and 600mm depths confirms one hour of fire resistance in separating floor applications. These outstanding fire safety attributes provide assurance that your project satisfies demanding safety requirements.

Durability

140mm Knauf Rocksilk Flexible Slab remains odourless, rot-resistant, non-hygroscopic, resists vermin colonisation and prevents fungal, mould and bacterial growth. The product maintains structural integrity equivalent to the building fabric in which it is installed.

Info

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