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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).

Manufactured in accordance with:

  • ISO 9001: 2008 (Quality Management Systems - Requirements).
  • ISO 14001: 2004 (Environmental Management Systems - Requirements).
  • BS OHSAS 18001: 2007 (Occupational Health and Safety Management Systems - Requirements).
  • 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:



- 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.

- Kooltherm packer board:

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


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

Thermal conductivity:

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

Fire performance:

Consult manufacturer for details.

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