Kingspan Thermataper TT47

For use beneath mechanically fixed/ fully adhered single-ply waterproofing, and partially bonded built-up felt and mastic asphalt flat roofing systems.


A tapered version of Kingspan Thermaroof TR 27, Kingspan Thermataper TT47 board is designed for use beneath mechanically fixed or fully adhered single-ply non-bituminous roofing systems.

The Kingspan Thermataper range has been specifically designed to prevent water ponding, the most common cause of failure of flat roofs.

U-value calculations for the Kingspan Thermataper range incorporate BS EN ISO 6946: 1997- Annex C (Building Components and Building Elements). Annex C outlines the calculation procedure to determine the total thermal transmittance of tapered insulation - what is termed the 'Annex C U Value'.

It is CFC-/ HCFC- free and is manufactured with a blowing agent that has zero Ozone Depletion Potential (ODP), achieves a BRE Green Guide rating of A.

Kingspan Thermataper TT47 is manufactured under a management system certified to ISO 9001: 2015 (Quality Management Systems. Requirements), ISO 14001: 2015 (Environmental Management Systems. Requirements),  ISO 45001: 2018 (Occupational Health and Safety Management Systems) and ISO 50001: 2011 (Energy Management Systems. Requirements with guidance for use).

It is also manufactured in accordance with the Harmonised Standard BS EN 13165: 2001 (Thermal insulation products for buildings- Factory made rigid polyurethane foam (PUR) products- Specification).

General information

Uniclass 2015

Pr_25_71_63_66 Polyisocyanurate (PIR) foam boardsPrimary


J21/10 Warm deck roof coating

J21/420 Rigid urethane foam warm deck roof insulation

J41/10 Built-up reinforced bitumen membrane warm deck roof covering

J41/420 Rigid urethane foam warm deck roof insulation

J42/10 Warm deck roof covering

J42/420 Rigid urethane foam warm deck roof insulation

Specification data - Polyisocyanurate (PIR) foam boards Enhanced data

Third party product certification

Certified to BES 6001.

Framework Standard for the Responsible Sourcing of Construction Products for boards produced at Kingspan Insulation’s Pembridge and Selby manufacturing facilities.

Fire performance

Details on the fire performance of Kingspan Insulation products may be obtained from the Kingspan Insulation Technical Service Department.

Thermal conductivity (maximum)

0.026 W/m·K.

<80 mm thickness.

0.025 W/m·K.

80–119 mm thicknesses.

0.024 W/m·K.

≥120 mm thicknesses.

Cross section


Thickness (nominal)

Refer to manufacturer's literature or Technical Services department for details of available thicknesses.


Face size (length x width)

1200 x 1200 mm.


Autohesively bonded coated glass tissue.

Product Reference

Thermataper TT47

Standard Falls





Third party certifications
  • BBA Approval Inspection Testing Certificate No 06/4372
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