Kooltherm K8 Cavity Board

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Rigid Cavity Wall Insulation

Kingspan Kooltherm K8 Cavity Board is a super high performance, fibre-free rigid insulation suitable for cavity wall applications. It has a thermoset phenolic insulation core, sandwiched between two layers of reflective, low emissivity composite foil autohesively bonded to the insulation core during manufacture. This reflective, low emissivity surface improves the thermal resistance of any cavity adjacent to the board.

  • Clear cavity is maintained - resists moisture penetration
  • Low emissivity foil facings significantly increase thermal resistance of cavity
  • CFCs/HCFCs free, zero Ozone Depleting Potential (ODP), and low Global Warming Potential (GWP)

Product Information

Product Data table
R-values
Specification Guide
Installation Instructions
CAD Drawings
Testing and Data Table
Product Data  
Thermal Conductivity (λ-Value) 0.021 W/m·K (Insulant Thickness 25 - 44 mm)
Emittance (Foil Face) E0.06
Product Dimensions 2270 mm x 400 mm (0.9 m2)
Other dimensions available upon enquiry. Minimum order quantities apply
Product Thickness 25, 40 mm 
Other thicknesses available upon enquiry. Minimum order quantities apply

Assumptions & Key

The R-values shown are Total R-values for the building element and are calculated in accordance with AS/NZS 4859.1 and NZS 4214. Kingspan Kooltherm products are manufactured, tested and packaged in conformance with AS/NZS 4859.1. The contribution of the product Total R-values depends on installation and environmental conditions.

Product R-values

 Product Thickness  Product R-value
 50 mm  R1.2
 80 mm  R1.9

System R-values

Click on the specific application types below to view their System R-values

Double Brick Cavity Wall

View System R-value

Brick / Block Cavity Wall

View System R-value

Register your specification - Optional

By registering your specification with us, our dedicated area manager will be able to get in touch and provide any further assistance that you might require.
Register Your Specification 


Specification Clause

The cavity wall insulation shall be Kingspan Kooltherm K8 Cavity Board        mm thick, with a tested smoke obscuration of not more than 100 m2/kg, comprising a CFC/HCFC–free and zero Ozone Depletion Potential (ODP) rigid thermoset phenolic insulation core faced on both sides with reflective, low emissivity composite foil manufactured under a management system certified to BS/I.S. EN ISO 9001:2008, BS/I.S. EN ISO 14001:2004 and BS/I.S. OHSAS 18001:2007 by Kingspan Insulation Limited and shall be installed in accordance with the instructions issued by them.

A Project Specific Warranty provided by Kingspan Insulation must be submitted.

Handling & Storage

View Instructions

PDF Format

CAD PDF - Cavity Wall_Kooltherm_K8

DWG Format

CAD DWG - Cavity Wall_Kooltherm_K8

Testing & Data Table

Management Standards

 Standard  Management System
ISO 9001:2015  Quality Management
ISO 14001:2015  Environmental Management
OHSAS 18001:2007  Health and Safety Management
ISO 50001:2011 Energy Management 


Product Testing

 Characteristic  Standard  Result
 Compressive Stress AS 2498.3  Typically exceeds 100 kPa at 10% compression
 Water Vapour Resistance  BS EN 12086:1997 / I.S. EN 12086:1998  > 100 MN·s/g


Fire Performance

 Test  Test Method  Result
 Ignitability
 Flame Spread
 Heat Release
 Smoke  Release
 AS 1530.3  Spread of Flame Index: 0
Smoke Development: ≤ 3
Flame Propagation (AS 1366) AAS 2122.1 Complies 



Environmental Data Table

 Recyclability Non-contaminated insulation site waste is recyclable, but there are currently no facilities in  Australia to process returned material
 Re-usability Re-usable if removed with care (long term of service expected)
 Water Use No water used in Kingspan Insulation's manufacturing process
Blowing Agent Global Warming  Potential (GWP) Manufactured with a blowing agent that has low GWP
Blowing Agent Ozone Depletion  Potential (ODP) Manufactured with a CFC/HCFC-free blowing agent that has zero ODP
Packaging Contains 0% recycled product
Polythene wrap and EPS skids 100% recyclable

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Contact Us

Kingspan Insulation New Zealand

We're ready to help. For any enquiries, call 0800 1 23 23 1 or send an email to info@kingspaninsulation.co.nz.

666 Great South Road

Level 3, Building 10,

New Zealand

Ellerslie, Auckland

0800 1 23 23 1

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