Therma TT47

Therma T27 T47 Wedge

Tapered Insulation To Enhance Water Drainage From Flat Roofs

Kingspan Therma TT47 is a tapered high performance, fibre-free rigid thermoset insulation, faced on both sides with a coated glass tissue 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

Product Data table
Specification Guide
Testing and 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  or Kingspan Therma TT47 in a wider range of falls please contact the Kingspan Insulation Technical Service team at
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. 
The roof insulation shall be Kingspan Therma TT47 ____ mm thick, comprising a CFC/HCFC-free and zero Ozone Depletion Potential (ODP) rigid thermoset insulation core with coated glass tissue 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.

Management Standards

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

Kingspan Therma TT47 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 4841-3 Specification for laminated boards (roofboards) with auto–adhesively or separately bonded facings for use as roof board thermal insulation under built–up bituminous roofing membranes
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 > 7 MN·s/g·m

Fire Performance

Kingspan Therma TT47, 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: 5

Kingspan Therma TT47, when subjected to the British Standard fire test, specified in the table below, will achieve the result shown when waterproofed with 3 layer built–up felt and a loading coat of 10 mm chippings. For specifications without the chippings please consult the manufacturer of the mineral surfaced cap sheet for their fire classification details.
Test Result
BS 476-3: 2004
(external fire exposure roof test)
FAA Rating

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

FM Certification

Kingspan Therma TT47 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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