NBS Source
List your products

Kingspan Thermaroof TR31 combines decking, insulation and vapour control layer in a single product. Suitable for use beneath built-up felt roofing systems this offers all the benefits of a warm roof construction whilst being quick and simple to install.

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

Kingspan Thermaroof TR31 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 Thermaroof TR31 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 TR31


___ mm

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

Standard product features

Board size:

  • Length: 2.4 m.
  • Width: 1.2 m.

Thermal conductivity:

  • All insulation thicknesses: 0.022 W/m·K.
  • 6 mm Weather and Boil-proof (WBP) plywood component - 0.014 W/m·K.


  • Upper facing: 6 mm WBP exterior grade plywood bonded to the insulation core.
  • Lower facing: Faced both sides with a low emissivity composite foil autohesively bonded to the insulation core during manufacture. This reflective, low emissivity surface improves the thermal resistance of any unventilated cavity adjacent the board.

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 TR31 achieves a BRE Green Guide rating of A+.

Product Options

When a U-value lower than 0.20 W/m²•K is required, Kingspan Insulation recommends the use of an additional layer of Kingspan Kooltherm K7 Pitched Roof Board between roof joists.

Similar products from Kingspan Insulation