Home > Companies > ROCKWOOL Ltd > Rockwool Cavity Wall Batts

Stone wool insulation batts approved and certified by the BBA for fully filling masonry cavities in buildings up to 25 m in height.

Water repellent and rot proof insulation offering excellent thermal, acoustic and fire performance.

Rockwool Cavity Wall Batts are CE and Key marked in accordance with BS EN 13162.

Non-combustible, achieving a classification of A1 in accordance with BS EN 13501-1.

Rockwool is a ‘breathable’ material with a vapour resistivity similar to air (5.9 MNs/gm). Rockwool Cavity Wall Batts therefore reduce the risk of condensation and allow natural drying out of the wall construction.

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.

Standard product features


  • 1200 mm length x 455 mm width.
  • The standard product width is suitable for wall ties spaced at 450 mm vertical centres.
  • Other widths and thicknesses are available to order, depending on quantity.


To conform with the tolerance limits given in BS 6676-2: 1986, the as-built clear cavity width should be no more than 15 mm wider than the insulation thickness (10 mm for 50 and 60 mm thick batts), e.g. maximum clear cavity width for 100 mm thick insulation is 115 mm.

Thermal conductivity:

0.037 W/mK.


Manufactured to BS EN 13162 and conforming with BS 6676-1.

NBS Specification

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This product is associated with the following NBS Create clause:
45-45-70/380 Mineral fibre slab insulation

NBS Specification

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This product is associated with the following NBS clauses:

Product specification

An important note about specifying





+44 (0)1656 862621

Product reference

Rockwool Cavity Wall Batts


[50 mm]
[65 mm]
[75 mm]
[80 mm]
[90 mm]
[100 mm]
[110 mm]
[120 mm]

Manufacturer details

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