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ROCKWOOL® Fire Barrier Slab

ROCKWOOL Fire Barrier Slab is an aluminium foil faced slab used to close voids of up to 1m in height and 20m in length supported by a masonry wall (minimum density of 400 kg/m3) offering the same fire performance.

The slabs are cut to height and friction fitted within the opening. ROCKWOOL Acoustic Intumescent Sealant or ROCKWOOL LUL Intumescent Sealant is applied to the butt joints and perimeter of the barriers.

Rockwool insulation products do not contain blowing agents with an ozone depletion potential (ODP) or global warming potential (GWP), are CFC-HCFC-HFC free and 97% recyclable. They will not react with metal components or cause loss of plasticiser from PVC cables and pipes.


  • Fire Barrier Systems offer labour-saving solutions to prevent the spread of fire and smoke within roof and ceiling voids.
  • Ease of construction and installation reduces the risk of installation errors.
  • Systems available to provide up to 4 hours Fire Protection.

General information


Stone wool




1000 x 666 mm

Uniclass 2015

Pr_25_57_06_56 Mineral wool slab insulationPrimary


F30/670 Head of non-loadbearing walls

K10/545 Cavity fire barriers within suspended ceilings

P10/410 Flexible cavity barriers

P10/432 Cavity barriers

P12/360 Mineral wool rigid batts

P12/40 Mineral wool rigid batts

Specification data - Mineral wool slab insulation

Product Reference

ROCKWOOL Fire Barrier Slab


ROCKWOOL Acoustic Intumescent Sealant

ROCKWOOL LUL Intumescent Sealant

Standard product features


1000 x 666 x 100 mm.


Foil faced both sides.

Reaction to fire class:

A1 to BS EN 13501-1.


  • Non-combustible, achieving a classification of A1 in accordance with BS EN 13501-1.
  • No penetrations - 4 hour integrity; 1 hour insulation Service penetrations 1½ hour integrity; 1 hour insulation when subjected to BS 476:Part 20 and 22: 1987 – reference WFRC – report C122729.

Digital objects
PlatformCompatibleVersionCertified to
IFC2X3 3 1.3
- 1.0
- 1.0
- 1.0
Revit 2016 4 2.0
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