Home > Companies > ROCKWOOL Ltd > ROCKWOOL Rockfloor Thermal

A high compressive strength, dual density, stone wool board with a tissue face finish on the top surface, specially formulated for thermal insulation of ground and suspended floors subject to normal floor loads arising in houses, offices, shops and similar areas.

Designed to be laid under screeds, concrete slabs, flooring grade t&g particleboard, OSB, plywood.

The dual density enables the insulation to be laid over a slightly uneven surface, with the lower density layer absorbing imperfections and the high density surface providing excellent point load resistance.

Offers excellent thermal, acoustic and fire protection insulation.

Water repellent, rot proof, and suitable for use in both wet and dry constructions; requires a dpm to protect against rising damp.

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 acoustic and thermal properties.
  • Minimises thermal and acoustic bridging.
  • High compressive resistance.
  • Easy handling and fitting.

Standard product features

Thermal conductivity:

0.040 W/mK.

Reaction to fire class:

A1 to BS EN 13501-1.

NBS Specification

NBS Create logo
This product is associated with the following NBS Create clause:
45-45-70/385 Mineral wool slab insulation

Product specification

An important note about specifying





+44 (0)1656 862621

Product reference

ROCKWOOL Rockfloor Thermal

Board Size

1000 mm x 600 mm


[50 mm]
[60 mm]
[80 mm]
[100 mm]


[25 mm Rockfloor Acoustic at perimeter abutments]

Manufacturer details

14th Floor, Chiswick Tower,
389 Chiswick High Road,
London, W4 4AJ
Tel +44 (0)1656 862621
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