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


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.

General information
Specification data - Polyisocyanurate (PIR) foam boards
Product Reference

Kingspan Thermataper TT44-K


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

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.

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