Kingspan Thermataper TT46

For use beneath mechanically fixed single-ply flat roofing systems.


A tapered version of Kingspan Thermaroof TR26, Kingspan Thermataper TT46 board is designed for use beneath mechanically fixed 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'. Kingspan Thermataper TT46 is CFC/ HCFC free and is manufactured with a blowing agent that has zero Ozone Depletion Potential (ODP).

Kingspan Thermataper TT46 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). Kingspan Thermataper TT46 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


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. Kingspan Thermataper TT46 achieves a BRE Green Guide rating of A+.

Fire performance

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


Thermal conductivity (maximum)

0.022 W/m·K.

Thickness (nominal)

___ mm.

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

Kingspan Thermataper TT46

Standard Falls

1: 60

1: 80

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