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ROCKWOOL Soffit Slab

Soffit Slab consists of a non-combustible rigid ROCKWOOL® board with a variety of facings and is particularly suited for providing cost effective fire resistance and thermal insulation through soffits and similar applications.

The robust stone-wool slab offers significant thermal insulation, acoustic absorption and up to 4 hours fire resistance. It is available in a range of thicknesses with a facing options including aluminium foil or black / white tissue facing.

Hi impact soffit slab is available with a 6 mm rigid Promat PROMATECT® HD board facing, this combination of two non-combustible products provides increased impact resistance and durability.

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.


  • Excellent thermal performance.
  • Effective acoustic insulation.
  • Non-combustible stone wool insulation and facing options.
  • Fire resistance tested in-situ on a concrete soffit for insulation and integrity.
  • Cost effective and easy to install.
  • Water repellent.
  • Easily cut to accommodate services.
  • Simply butt together at joints.
  • Hi-impact option for durability, using non-combustible 6 mm Promat PROMATECT® HD boards.

General information

1000 x 600 mm

1200 x 600 mm

High Impact.

Uniclass 2015
Pr_25_57_06_56 Mineral wool slab insulationPrimary

K11/60 Board

K11/885 Fire protection board

K11/890 Board

Specification data - Mineral wool slab insulation
Product Reference

ROCKWOOL Soffit Slab

ROCKWOOL High-Impact Soffit Slab


130 mm

145 mm

160 mm

180 mm


1000 x 600 mm

1200 x 600 mm

High Impact.



Foil Faced

Tissue Faced – Black

Tissue Faced – White

Standard product features


1000 x 600 mm.

Thermal conductivity:

0.034 W/mK.


200mm long ITW RoofGrip (HRG 200) with 50mm plate washer.


ROCKWOOL® Soffit Slab achieves a reaction to fire classification of A1 as defined in BS EN 13501-1.

ADB 2000 (2006 edition)Soffit Slabs have been tested to BS EN 1363-1 to offer fire protection to reinforced concrete floors.

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