Rock Mineral Wool - Knauf Insulation Rocksilk® Soffit Linerboard Standard

Knauf Insulation Rocksilk® Soffit Linerboard Standard


Structural soffit floor


Rock Mineral Wool


Rocksilk® Soffit Linerboard Standard is a Rock Mineral Wool slab, designed to insulate structural soffits in applications such as underground car parks.

It is non-combustible with the best possible Euroclass A1 reaction to fire classification, and is manufactured using Knauf Insulation's unique bio-based binder, ECOSE® Technology.

Have you seen our newly released colour match fixings for Rocksilk® Soffit Linerboard? Ask your sales rep today for more information.


  • Available both unfaced and in a number of faced options
  • Provides a solution to upgrade thermal performance of existing floors without reducing floor height.
  • Can be installed without the need to access areas above the floor.



Thickness (mm) Length (mm) Width (mm) Thermal Conductivity (W/mK) R-Value (M²K/W) Euroclass Reaction to Fire Classification Facing Quantity per pack
50 1200 600 0.034 1.45 A1 Unfaced 6
75 1200 600 0.034 2.20 A1 Unfaced 4
130 1200 600 0.034 3.80 A1 Faced 40
160 1200 600 0.034 4.70 A1 Faced 32
185 1200 600 0.034 5.40 A1 Faced 28
220 1200 600 0.034 6.45 A1 Faced 20

Certification & Memberships

Eurofins Gold Eurofins Gold
Euroclass A1 Reaction to Fire Classification Euroclass A1 Reaction to Fire Classification
CE Marking CE Marking
Green Guide Rating A Green Guide Rating A
EN 15804 EN 15804
Made in Britain Made in Britain


Product Videos