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Kingspan Thermaroof TR21

Third party certifications:
  • BBA Agrément Certificate

    Certificate type

Kingspan Insulation

A high performance, rigid polyisocyanurate (PIR) flat roof insulation board, for use beneath partially bonded-up felt and mastic asphalt.

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+44 (0)1544 388601 www.kingspaninsulation.co.uk

Kingspan Thermaroof TR21 is designed for use beneath partially bonded bitumen membranes and mastic asphalt, other than insulated balconies, waterproofed with mastic asphalt with a porous promenade tile overlay.

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

Kingspan Thermaroof TR21 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).Thermaroof® TR21 is manufactured in accordance with BS EN ISO 14001 Environmental Management Systems, BS EN ISO 9001 Quality Management Systems and OHSAS 18001 Health and Safety Management System.

Kingspan Thermaroof TR21 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
Specification data - Polyisocyanurate (PIR) foam boards
Product Reference

Thermaroof TR21


___ mm

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

Standard product features

Board size:

  • Length: 1.2 m.
  • Width: 0.6 m.

Thermal conductivity:

Insulating core:

  • Insulation thicknesses <80 mm: 0.027 W/m·K.
  • Insulation thicknesses 80–119 mm: 0.026 W/m·K.
  • Insulation thicknesses ≥120 mm: 0.025 W/m·K.


Faced on both sides with glass reinforced perforated cellulose 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 Thermaroof TR21 achieves a BRE Green Guide rating of A.

Third party certifications
  • BBA Approval Inspection Testing Certificate No 06/4384
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