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Premium performance rigid thermoset insulation for external walls. It is manufactured under a management system certified to BS / I.S. EN ISO 9001: 2008 (Quality Management Systems. Requirements), BS / I.S. EN ISO 14001: 2004 (Environmental Management Systems. Requirements) and BS / I.S. OHSAS 18001: 2007 (Health and Safety Management Systems. Requirements).

Kingspan Kooltherm® K5 External Wall Board achieves a BRE 2008 Green Guide Summary Rating of A+.

Standard product features

Board size:

  • Length: 1.2 m.
  • Width: 0.6 m.


Kingspan Kooltherm® K5 External Wall Board is faced on both sides with a glass tissue based facing, autohesively bonded to the insulation core during manufacture.


The core of Kingspan Kooltherm® K5 External Wall Board is a premium performance rigid thermoset modified resin insulant manufactured with a blowing agent that has zero Ozone Depletion Potential (ODP) and low Global Warming Potential (GWP).

Thermal conductivity:

  • 0.023 W/m.K (insulant thickness 15–24 mm);
  • 0.021 W/m.K (insulant thickness 25–44 mm); and
  • 0.020 W/m.K (insulant thickness ≥ 45 mm).

Fire Performance:

Kingspan Kooltherm® K5 External Wall Board will achieve the results given below, which enable it to be classified by the Building Regulations as being Class 0 and as Low Risk by the Technical Standards in Scotland.

  • BS 476-6: 1989 – Fire Propagation index of performance (I) not exceeding 12 and sub index (i) not exceeding 6 (for rigid phenolic insulation core) when tested.
  • BS 476-7: 1997 – Class 1 rating when tested.

Further details on the fire performance of Kingspan Insulation products may be obtained from the Kingspan Insulation Technical Service Department.

NBS Specification

NBS Create logo
This product is associated with the following NBS Create clause:
45-45-65/420 Phenolic foam board

Product specification

An important note about specifying



Kingspan Insulation


+44 (0)1544 388601

Product reference

Kingspan Kooltherm® K5 External Wall Board

Insulation thickness

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Manufacturer details

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