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Kingspan Thermataper TT44 tapered roof insulation combined with Kooltherm packer board for reduced overall thickness.

Features and benefits:

  • Potential thickness savings of 20–40 mm (dependent on the individual scheme and build-up, when compared with a full Polyisocyanurate (PIR) system).
  • No structural fall required.
  • For refurbishment applications, and can typically be installed above the existing roof surface (with a waterproof membrane).
  • Manufactured with a blowing agent that has zero Ozone Depletion Potential (ODP) and low Global Warming Potential (GWP).

Kingspan Thermataper TT44 tapered roof insulation and Kingspan Kooltherm packer board are both 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).


Suitable for use on new and existing roofs with timber or concrete decks.

Standard product features

Size (l x w):

1.2 x 0.6 m.

Manufactured rate of fall:



- Kingspan Thermataper TT44:

  • Upper facing: Bitumen coated glass tissue finished with a thermofusible polypropylene fleece autohesively bonded to the insulation core.
  • Lower facing: Mineralized glass tissue autohesively bonded to the insulation core.

- Kingspan Kooltherm packer board:

Both sides with a glass tissue based facing, autohesively bonded to the insulation core.


  • Kingspan Thermataper TT44: Manufactured with Nilflam technology (high-performance rigid thermoset fibre-free polyisocyanurate (PIR) insulant).
  • Kingspan Kooltherm packer board: High-performance fibre-free rigid thermoset phenolic insulant.

Thermal conductivity:

  • Kingspan Thermataper TT44 (thickness): <80 mm: 0.026 W/m·K; 80–119mm: 0.025 W/m·K; ≥120 mm: 0.024 W/m·K.
  • Kingspan Kooltherm packer board: 0.018 W/m·K.

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 TT44 achieves a BRE 2008 Green Guide Summary 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 TT44-K

Insulation thickness

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Manufacturer details

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