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Premium performance rigid thermoset phenolic insulation board for use in partial fill cavity walls.

Kingspan Kooltherm K8 Cavity Board is manufactured with a blowing agent that has zero Ozone Depletion Potential (ODP) and low Global Warming Potential (GWP).

Kingspan Kooltherm K8 Cavity Board is manufactured in accordance with ISO 9001: 2015 (Quality Management Systems. Requirements), ISO 14001: 2015 (Environmental Management Systems. Requirements), BS OHSAS 18001: 2007 (Occupational Health and Safety Management Systems. Requirements) and ISO 50001: 2011 (Energy Management Systems. Requirements with guidance for use).

General information
Specification data
Product Reference

Kingspan Kooltherm K8 Cavity Board


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

Standard product features

Board size:

  • Length: 2.4 m.
  • Width: 0.45 m.


Kingspan Kooltherm K8 Cavity Board is faced on both sides with a low emissivity composite foil, autohesively bonded to the insulation core during manufacture.


The core of Kingspan Kooltherm K8 Cavity Board is a premium performance fibre-free rigid thermoset phenolic insulant.

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:

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 manufacturing facility.

Third party certifications
  • BBA Approval Inspection Testing Certificate No 14/5134
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