Therma TR26

Therma T26

Insulation For Waterproofed Flat Roofs

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

Product Information

Product Data Table
Specification Guide
Typical Constructions
Testing and 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

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
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 Kinspan Insulation must be submitted.

Specify with:NatSpec logo

Dense Concrete Deck with Suspended Ceiling

Construction Reference

Metal Deck With No Ceiling

Construction Reference

Green Roof Covering Metal Deck with No Ceiling

Construction Reference

Green Roof Dense Concrete Deck With Suspended Ceiling

Construction Reference

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 Kingspan Insulation Technical Service.

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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Kingspan Insulation Australia

Kingspan Insulation operates Australia wide. Contact us to find your local State Representative. For any enquiries, call 1300 247 235 or send an email to

Head Office

25 Oherns Road,

Somerton, VIC


Call: 1300 247 235

Fax: 1300 247 329