Kingspan Therma TT46 Insulation


Tapered Insulation To Enhance Water Drainage

From Flat Roofs


Kingspan Insulation

Kingspan Therma TT46 is a tapered 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
  • Insulation and drainage in one
  • Easy to handle and install

     Back to Kingspan Insulation

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    Product Data Table

    Product Dimensions 1200 mm x 1200 mm (1.44 m²)
    Product thickness Systems with a 1:30 & 1:40 fall: 60 mm minimum
    Systems with a 1:60 & 1:80 fall: 30 mm minimum
    All systems: Unlimited maximum*
    Taper Gradients Falls of 1:30, 1:40, 1:60 and 1:80**

    *Packer boards will be required above a specific thickness.
    **For information regarding tapered roof designs incorporating 
    Kingspan Therma TT46 in a wider range of falls please contact the Waterproofing Direct Technical Service team at


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    Assumption and Key

    The effective thermal conductivity and thermal resistance of the insulation in a tapered roofing system is specific to the individual roof design. The Kingspan Insulation Tapered Roofing Department performs calculations to determine these values in accordance with Annex C of BS EN ISO 6946: 2007 (Building components and Building elements – Thermal resistance and thermal transmittance – Calculation method) as part of the scheme design process. 


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    Specification Guide

    The roof insulation shall be Kingspan Therma TT46____ 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 ISO 9001:2015, ISO 14001:2015 and 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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    Testing and Data Table

    Management Standards

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

    Kingspan Therma TT46 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

    Fire Performance

    Kingspan Therma TT46, when subjected to the British and Austrlian Standard fire tests 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 AS 1366)

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

    FM Certification

    Kingspan Therma TT46 is certified as achieving Class 1 Insulated Steel Deck Pass to Factory Mutual Research Standards 4450 (Approval Standard for Class 1 Insulated Steel Deck Pass) and 4470 (Approval Standard for Single–Ply, Polymer–Modified Bitumen Sheet, Built–Up Roof (BUR) and Liquid Applied Roof Assemblies for use in Class 1 Non-combustible Roof Deck Construction), subject to the conditions of approval as a roof insulation product for use in Class 1 roof constructions as described in the current edition of the Factory Mutual Research Approval Guide.


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    Get in touch

    Would you like to speak with one of our team to see how you can use Kingspan TT46 in your project? Call 1300 557 973 or fill out the form below.