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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 LPC/FM is CFC / HCFC free and is manufactured with a blowing agent that has zero Ozone Depletion Potential (ODP).

Kingspan Thermataper TT46 LPC/FM is manufactured under a management system certified to ISO 9001: 2015 (Quality Management Systems. Requirements), ISO 14001: 2015 (Environmental Management Systems. Requirements), BS OHSAS 18001: 2007 (Occupational Health & Safety Management Systems. Requirements) and ISO 50001: 2011 (Energy Management Systems. Requirements with guidance for use).

Kingspan Thermataper TT46 LPC/FM 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).

Standard product features

Board size:

  • Length: 1.2 m.
  • Width: 1.2 m.

Thermal conductivity:

All insulation thicknesses: 0.022 W/m·K.


Faced both sides with a low emissivity composite foil autohesively bonded to the insulation core during manufacture.

Fire performance:

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

Responsible sourcing:

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 LPC/FM achieves a BRE Green Guide rating of A+.

NBS Specification

NBS Create logo
This product is associated with the following NBS Create clause:
45-45-65/430 Polyisocyanurate (PIR) foam board

Product specification

An important note about specifying



Kingspan Insulation


+44 (0)1544 388601

Product reference

Kingspan Thermataper TT46 LPC/ FM

Insulation thickness

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

Standard Falls

[1: 60]
[1: 80]

Manufacturer details

Kingspan Insulation Ltd,
Herefordshire, HR6 9LA
Tel +44 (0)1544 388601
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