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Structural Products

Isover Cavity Wall Slab (CWS) 36

Thermal Insulation for External Masonry Cavity Walls
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Thermal Insulation for External Masonry Cavity Walls
 
 
 
 
 
 

Description

Isover Cavity Wall Slab (CWS) 36 is a glass mineral wool slab providing thermal performance in external masonry cavity walls. Manufactured with a water repellent binder, the strong, resilient and flexible slabs are 455mm wide to fit between standard wall tie spacing.

Key Benefits

  • Thermal Insulation - Thermal conductivity of 0.036 W/m.K. Helps to reduce heat loss within the building envelope and as a result decreases energy costs.
  • Isover Cavity Wall Slab (CWS) 36 has Eurofins Indoor Air Comfort® Gold Certification - the highest accreditation for indoor air quality.
  • BBA Certified - Cavity Wall Slab (CWS) 36 has been assessed by the BBA as fit for use in defined full fill and partial fill masonry cavity wall applications if installed, used and maintained as set out in the certificate. Please read the certification at isover.co.uk/BBA for full details and restrictions.
  • Fire Classification - Achieves a Euroclass A1 Reaction to Fire classification, according to EN 13501-1. For enquiries regarding test data for Reaction to Fire classifications, please contact [email protected].
  • Ease of Install - Slabs are 455mm wide to fit standard wall tie spacing for straightforward installation. No requirement for retaining discs when fully filling the cavity.
  • Sustainability
    • Contains Recycled Glass - Isover Cavity Wall Slab (CWS) 36 contains recycled glass. A combination of 52% externally sourced recycled glass and 30% internally sourced glass cullet.
    • Renewable Electricity - All electric equipment in the plant powered by 100% renewable electricity.

Application

External Walls

Product Variants

Articles information
Name Thickness (mm) Length (mm) Width (mm) Pack/Roll Area (m2) Slabs/Batts per pack Rolls/Packs per Pallet Pallet Area (m2) λD Declared thermal conductivity (W/m.K) RD Declared thermal resistance (m².K/W)
Name5200625441 Thickness (mm)50 Length (mm)1200 Width (mm)455 Pack/Roll Area (m2)10.92 Slabs/Batts per pack20 Rolls/Packs per Pallet20 Pallet Area (m2)218.4 λD Declared thermal conductivity (W/m.K)0.036 RD Declared thermal resistance (m².K/W)1.35
Name5200625443 Thickness (mm)65 Length (mm)1200 Width (mm)455 Pack/Roll Area (m2)8.74 Slabs/Batts per pack16 Rolls/Packs per Pallet25 Pallet Area (m2)218.4 λD Declared thermal conductivity (W/m.K)0.036 RD Declared thermal resistance (m².K/W)1.8
Name5200625445 Thickness (mm)75 Length (mm)1200 Width (mm)455 Pack/Roll Area (m2)8.74 Slabs/Batts per pack16 Rolls/Packs per Pallet20 Pallet Area (m2)174.72 λD Declared thermal conductivity (W/m.K)0.036 RD Declared thermal resistance (m².K/W)2.05
Name5200625447 Thickness (mm)85 Length (mm)1200 Width (mm)455 Pack/Roll Area (m2)6.55 Slabs/Batts per pack12 Rolls/Packs per Pallet20 Pallet Area (m2)131.04 λD Declared thermal conductivity (W/m.K)0.036 RD Declared thermal resistance (m².K/W)2.35
Name5200625449 Thickness (mm)100 Length (mm)1200 Width (mm)455 Pack/Roll Area (m2)6.55 Slabs/Batts per pack12 Rolls/Packs per Pallet20 Pallet Area (m2)131.04 λD Declared thermal conductivity (W/m.K)0.036 RD Declared thermal resistance (m².K/W)2.75
Name5200625451 Thickness (mm)125 Length (mm)1200 Width (mm)455 Pack/Roll Area (m2)4.37 Slabs/Batts per pack8 Rolls/Packs per Pallet25 Pallet Area (m2)109.2 λD Declared thermal conductivity (W/m.K)0.036 RD Declared thermal resistance (m².K/W)3.45
Name5200625453 Thickness (mm)150 Length (mm)1200 Width (mm)455 Pack/Roll Area (m2)3.28 Slabs/Batts per pack6 Rolls/Packs per Pallet20 Pallet Area (m2)65.52 λD Declared thermal conductivity (W/m.K)0.036 RD Declared thermal resistance (m².K/W)4.15

Technical Information

Category Attribute Value
Category General Attribute Fire Classification Value Euroclass A1 Reaction to Fire classification according to EN 13501-1.
Category Standards and Certifications Attribute Quality Standard Value All Isover products are manufactured under Quality Management Standard – ISO 9001.
Attribute Indoor Air Quality Value Achieves a Eurofins Gold product status for indoor air quality.
Attribute EUCEB Value EUCEB certified demonstrating our mineral wool fibre products conform with Note Q of Regulation (EC) No 1272/2008.
Attribute Environmental Standard Value All Isover products are manufactured under Environmental Management System – ISO 14001.

Documents

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Certificates
4 datasheets related with the product
BBA - Isover Cavity Wall Slab - 18/5560 - Full Fill
BBA - Isover Cavity Wall Slab - 18/5560 - Partial Fill
Certificate - EUCEB
IACG-400-06-01-2025-Indoor-Air-Comfort-Gold-Certificate.pdf
Declaration of Performance
2 datasheets related with the product
DoP - 0012 CE - Isover Cavity Wall Slab
DoP - 0012 UK - Isover Cavity Wall Slab
Environmental Product Declaration (EPD)
7 datasheets related with the product
EPD - Isover Cavity Wall Slab CWS 36 - 100mm
EPD - Isover Cavity Wall Slab CWS 36 - 125mm
EPD - Isover Cavity Wall Slab CWS 36 - 150mm
EPD - Isover Cavity Wall Slab CWS 36 - 50mm
EPD - Isover Cavity Wall Slab CWS 36 - 65mm
EPD - Isover Cavity Wall Slab CWS 36 - 75mm
EPD - Isover Cavity Wall Slab CWS 36 - 85mm
Product Datasheet
1 datasheet related with the product
PDS - Isover Cavity Wall Slab (CWS) 36
Product guide
1 datasheet related with the product
Product and Delivery Guide.pdf
Safe Use Instruction Sheet
1 datasheet related with the product
SUIS - Safe Use Instruction Sheet
Isover Spacesaver

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