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Isover CWS 32 is a glass mineral wool slab supplied in 65–150 mm thicknesses. The strong, resilient and flexible batts are 455 mm wide to fit between standard wall tie spacing. Isover CWS 32 provides excellent thermal performance in external masonry cavity walls to meet and exceed Approved Document L (England and Wales) and Section 6 (Scotland).


Resilient to moisture damage in storage, during transportation and on site during installation.


  • All Isover products are manufactured under Environmental Management System – ISO 14001.
  • Zero Ozone Depletion Potential (ODP), Global Warming Potential (GWP) <5.
  • The manufacturing process does not use or contain CFC's, HCFC's or other damaging gases.


All Isover products are manufactured under Quality Management Standard – ISO 9001. All Isover UK manufactured glass mineral wool insulation has achieved a 'good' rating within BES 6001 - the Responsible Sourcing of Construction Products Framework.

Recycled content:

Isover glass mineral wool insulation is manufactured from up to 86% recycled glass.


  • Made from rot-proof non-hygroscopic materials.
  • Will not sustain vermin, nor breed or promote fungi or bacteria.

Handling and storage:

Isover products are supplied fully palletised:

  • Weatherproof packaging for outside storage.
  • Reduced haulage costs.
  • Less handling therefore less damage.
  • Reduced storage space.
  • Packs remain clean and in good condition.
  • Faster loading, unloading and counting.

Standard product features

Thermal conductivity:

0.032 W/m·K.


Euroclass A1 fire rating when classified with 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



Saint-Gobain Isover


+44 (0)192 8704135

Product reference

Isover CWS 32


[65 mm]
[75 mm]
[85 mm]
[100 mm]
[125 mm]
[150 mm]

Face size

1200 x 455 mm

Manufacturer details

White House Industrial Estate,
Cheshire, WA7 3DP
Tel +44 (0)192 8704135
NBS Plus
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