Isover CWS 36 Cavity Wall System Batt Light Duty 65mm 8.74m²

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A glass mineral wool full-fill cavity slab providing thermal performance in masonry cavity walls to meet UK thermal building regulations. Features: Provides excellent therm...Read more


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A glass mineral wool full-fill cavity slab providing thermal performance in masonry cavity walls to meet UK thermal building regulations.


  • Provides excellent thermal performance, reducing heat loss through the building envelope.
  • Non-combustible - Isover glass mineral wool insulation has an A1 Euroclass fire rating - The best attainable.
  • Recycled content - Manufactured from up to 86% recycled glass.
  • Protected planet - Zero Ozone Depletion Potential (ODP) and Global Warming Potential of less than 5

Technical data:

  • Dimensions (TxWxL) - 65x455x1200mm
  • Item type - Batts
  • Items per pack - 16
  • Pack area - 8.74m²
  • Thermal conductivity - 0.036W/mK
  • Thermal resistance - 1.80m²K/W
  • Material - Glass Mineral Wool
  • Pack Area - 8.74m²
  • Thermal Conductivity - 0.036W/mK
  • Thermal Resistance - 1.80m²K/W
  • Brand - Isover


  • Euroclass A1 fire rating when classified to - BS EN 13501-1
  • Compliance - Class ’O’

Water absorption:

  • Short term water absorption testing to - EN 1609 proves WS<1


  • Manufactured under Environmental Management System - ISO 14001:2004
  • Zero ODP (Ozone Depletion Potential), GWP < 5 (Global Warming Potential)
  • The manufacturing process does not use or contain CFC’s, HCFC’s or other damaging gases

BRE statement:

  • Isover CWS 36 corresponds to the BRE Global Green Guide online generic specification ‘Glass wool insulation’ ref 815320002 which achieves a summary rating of A+ within Domestic, Health, Industrial, Commercial, Retail, Education
  • NB: The density stated above is part of a generic BRE classification and does not reflect the exact specification of the product


  • Manufactured under Quality Management Standard - ISO 9001:2008
  • Manufactured under BS EN 13162:2012 and BS EN 13172:2012 (Thermal insulation products for buildings - Factory made mineral wool (MW) products)

Building regulations:

  • Helps to meet the requirements of UK thermal building regulations

Recycled content:

  • Isover glass mineral wool insulation is manufactured from up to 86% recycled glass that would otherwise go to landfill - This makes Isover one of the most environmentally sustainable insulation products on the market today


  • No change in reaction to fire properties for mineral wool products.
  • The fire performance of mineral wool does not deteriorate with time - The Euroclass classification of the product is related to the organic content, which cannot increase with time.
  • Thermal conductivity of mineral wool products does not change with time, experience has shown the fibre structure to be stable and the porosity contains no other gases than atmospheric air.
  • Will not accelerate corrosion with steel, copper or aluminium.
  • Will not sustain vermin, nor breed or promote fungi or bacteria.

Standards & Certifications:

  • BBA approved - Yes (CertNo:90/2465) external wall solution - The detail removes the requirement for retaining discs and cavity barriers
  • CE Marked - Yes (1121-CPR-BA0053) to BS EN 13162:2012 and BS EN 13172:2012
  • Designation code - MW EN13162 T4 WS

  • Manufacturer Code
  • Thermal Conductivity
  • Material
    Glass Mineral Wool
  • Coverage
  • Thermal Resistance
  • Approx. Coverage
  • Brand
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This product can be returned if returned unopened, unused and in a fully resalable condition, including the original packaging.

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