Rocksilk® Fabrication Slab 


Suitable for use in a wide range of fabrication applications.


Rocksilk® Fabrication Slab is a Rock Mineral Wool slab, designed for use in a wide range of fabrication applications.

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.

Features and benefits:

  • Good thermal performance.
  • Non-combustible A1 'Euroclass Reaction to Fire' classification.
  • Good sound absorption characteristics provide high levels of sound reduction.
  • Can be provided with a factory-applied foil or tissue facing, offering solutions for a wide variety of fabrication applications.
  • Robust product, allowing cutting to accurate tolerances for a range of applications.
  • A+ generic BRE 'Green Guide' rating.

General information



Tissue Faced

Foil Faced



Rock mineral wool.




1200 x 600 mm

Uniclass 2015

Pr_80_77_76_53 Mineral wool duct slab insulationPrimary


B15/110 Timber-framed

B15/120 Timber-framed

B15/130 Light gauge steel frame

B15/140 Precast concrete frame

C46/370 Making good of cavity wall insulation

E20/200 Proprietary underslab insulation

F30/10 Full fill cavity insulation

F30/150 Full fill cavity insulation

H11/110 Curtain walling

H11/780 Thermal insulation

H20/10 Sheet cladding

H20/150 Sheet cladding

H20/155 Sheet cladding

H30/311 Mineral wool thermal insulation

H31/271 Mineral wool thermal insulation

H31/50 Mineral wool thermal insulation

H42/482 Thermal insulation to rear of panels

H43/120 Metal insulating sandwich panel

H61/230 Mineral wool insulation on structural metal liner trays

H62/230 Mineral wool insulation on structural metal liner trays

H64/305 Mineral wool insulation on structural metal liner trays

H65/230 Mineral wool insulation on structural metal liner trays

H67/305 Mineral wool insulation on structural metal liner trays

H92/775 Thermal insulation

H92/776 Thermal insulation

J21/10 Warm deck roof coating

J21/425 Mineral wool warm deck roof insulation

J41/10 Built-up reinforced bitumen membrane warm deck roof covering

J41/425 Mineral wool (MW) warm deck roof insulation

J42/10 Warm deck roof covering

J42/425 Mineral wool (MW) warm deck roof insulation

K10/115 Metal stud partition system

K10/125 Metal stud partition system

K10/145 Wall lining system (metal studs)

K10/15 Lining on timber

K10/155 Wall lining system (metal studs)

K10/165 Wall lining system (metal framing)

K10/215 Suspended ceiling system

K10/220 Proprietary suspended ceiling system

K10/30 Metal stud

K10/35 Wall lining system (metal framing)

K11/115 Battened plywood floating floor

K11/125 Battened particleboard floating floor

K11/135 Battened oriented strand board floating floor

K11/145 Battened cement-bonded particleboard floating floor

K11/20 Battened particleboard floating floor

K11/215 Plywood floating floor

K11/225 Particleboard floating floor

K11/235 Oriented strand board floating floor

K11/245 Cement bonded particleboard floating floor

K11/25 Particleboard floating floor

K11/275 Acoustic separating floor system

K11/35 Oriented strand board flooring

K11/795 Wall lining on metal framing

K11/796 Metal stud partition system

K13/170 Acoustic panel lining

K20/150 Battened timber board floating floor

K21/111 Wood floating floor

K21/120 Battened wood flooring

K21/130 Battened wood floating floor

K21/140 Battened wood laminate flooring

K21/145 Composite laminate flooring

K21/146 Laminate flooring

M10/290 Floating construction

M10/40 Floating construction

M21/20 External wall insulation system . . . . . .

M21/210 External wall insulation system

P10/10 Loft insulation

P10/125 Insulation laid between ceiling ties/ joists

P10/135 Insulation laid across ceiling ties/ joists

P10/140 Insulation fitted between rafters

P10/148 Multilayer blanket insulation fixed under or above rafters

P10/15 Insulation fitted between rafters

P10/165 Insulation to eaves

P10/170 Insulation to loft access hatches

P10/180 Insulation to water cisterns

P10/190 Insulation fitted between studs

P10/212 Insulation fixed across inner face of stud walling

P10/217 Insulation slabs fixed to backing wall

P10/220 Sound insulation within timber framed separating wall

P10/240 Insulation fitted between floor joists

P10/25 Insulation to water cisterns

P10/250 Insulation supported between floor joists

P10/40 Insulation fitted betweenor to the face ofstuds

P10/45 Insulation laid between floor joists

P10/50 Insulation supported between joists

Specification data - Mineral wool duct slab insulation Enhanced data


BS EN 13162.



Thermal conductivity

0.037 W/mK.


Unfaced, foil faced; tissue faced.

Reaction to fire classification

EUROCLASS A1 to BS EN 13501-1.

Insulation thickness (minimum)

65 mm.

75 mm.

85 mm.

100 mm.

110 mm.

120 mm.

130 mm.

140 mm.

150 mm.

160 mm.

Product Reference

Knauf Insulation Fabrication Slab

Knauf Insulation Fabrication Slab Foil Faced

Knauf Insulation Fabrication Slab Tissue Faced

Environmental information

Country of material origin

United Kingdom

Recycled content

BRE generic Green Guide rating of A+.


Digital objects

Platform Compatible Version Certified to




Download now from NBS National BIM Library

Third party certifications

  • Eurofins Gold Certificate for Indoor Air Comfort: Certificate

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