Kingspan Therma TR26 Insulation

Insulation For Waterproofed Flat Roofs

Kingspan Therma TR26

Kingspan Therma TR26 is a high performance, fibre-free rigid thermoset insulation, faced on both sides with a low emissivity composite foil autohesively bonded to the insulation core during manufacture.

  • FM approved for Class 1 steel deck roof assemblies
  • Compatible with most green roof systems
  • Easy to handle and install


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    Product Data Table

    Thermal Conductivity (λ-Value) 0.023 W/m·K 
    Product Dimensions 2270 mm x 1200 mm (2.72 m2)
    Product Thickness 50, 60, 70, 80, 85, 90, 95, 100, 105, 110, 115, 120 mm


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    Assumption and Key

    The λ–values and R–values detailed on this page are quoted in accordance with AS/NZS 4859.1 tested to AS/NZS 1366.2 (Rigid cellular plastics sheets for thermal insulation Rigid cellular polyisocyanurate (RC/PIR)).


    Product R-values

     Product Thickness (inc. Plasterboard)  Product R-value
     50 mm  R2.2
     60 mm  R2.6
     70 mm  R3.0
     80 mm  R3.5
     85 mm  R3.7
     90 mm  R3.9
     95 mm  R4.1
     100 mm  R4.3
     105 mm  R4.6
     110 mm  R4.8
     115 mm  R5.0
     120 mm  R5.2



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    Specification Guide

    The roof insulation shall be Kingspan Therma TR26 ____ mm thick, comprising a CFC/HCFC-free and zero Ozone Depletion Potential (ODP) rigid thermoset insulation core with composite foil facings on both sides, 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.

    Specify with:NatSpec logo


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    Typical Constructions


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    Testing and Data Table

    Management Standards

    Standard Management System
    BS / I.S. EN ISO 9001:2008 Quality Management
    BS / I.S. EN ISO 14001:2004 Environmental Management
    BS / I.S. OHSAS 18001:2007 Health and Safety Management

    Kingspan Therma TR26 is also manufactured to the highest standards in accordance with the requirements of:

    Requirement Rigid polyisocyanurate (PIR) and polyurethane(PUR) products for building end–use applications
    BS 4841-4 Specification for laminated boards (roofboards) with auto–adhesively or separately bonded facings for use as roofboard thermal insulation under single−ply roofing membranes

    Spanning On Metal Decks

    Trough Opening (mm) Minimum Insulant Thickness (mm)
    ≤75 25
    76 - 100 30
    101 - 125 35
    126 - 150 40
    151 - 175 45
    176 - 200 50
    201 - 225 55
    226 - 250 60

    Product Testing

    Characteristic Standard Result
     Compressive Strength  AS 2498.3 Typically exceeds 150 kPa at 10% compression
    Water Vapour Resistance AS 2498.5 > 100 MN·s/g·m 

    Fire Performance

    Kingspan Therma TR26, when subjected to the British and Australian Standard fire test specified in the table below, will achieve the result shown, when waterproofed with a single–ply waterproofing membrane.

    Test Result
    BS 476-3: 2004
    (External fire exposure roof test)
    Dependent on single-ply membrane adopted
    AS 1530.3
    Ignitability, Flame Spread, Heat Release, Smoke Release)
    Spread of Flame Index: 0
    Smoke Development Index: 1
    AS 2122.1
    (Flame Propagation AS1366)

    Further details on the fire performance of Kingspan Insulation products may be obtained from the WPD Group Technical Team.

    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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    Get in touch

    Would you like to speak with one of our team to see how you can use Kingspan TR26 in your project? Call 1300 557 973 or fill out the form below.