Kingspan Kooltherm K8 Cavity Board

From: $463.12

Kingspan Kooltherm K8 is a cavity wall insulation board with reflective, low emissivity foil facings, significantly improving the thermal resistance of the cavity and is CodeMark-certified for NCC compliance.

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Kingspan Kooltherm K8 Cavity Wall Insulation

Kooltherm K8 Cavity Wall Insulation is a super high performance, fibre-free rigid thermoset closed cell phenolic insulation core, sandwiched between two layers of reflective, low emissivity composite foil autohesively bonded to the insulation core during manufacture. This reflective, low emissivity surface improves the thermal resistance of any cavity adjacent to the board.

Key Benefits of K8 Cavity Wall Insulation

  • Super high performance rigid¬†thermoset phenolic insulation
  • Fibre-free, closed cell¬†insulation core
  • Clear cavity is maintained ‚Ästresists moisture penetration
  • Low emissivity foil facings¬†significantly increase the¬†thermal resistance of the cavity
  • Easy to handle and install
  • Manufactured with a CFC/HCFC-free blowing agent that¬†has zero ODP and low GWP
  • Compliant with AS/NZS 4859.1
  • CodeMark-certified for¬†BCA¬†compliance

Installation Instructions for K8 Cavity Insulation

  1. Construct the inner leaf to at least an appropriate level to allow installation of Kingspan K8 Cavity Board toproceed.
  2. Remove excess mortar and mortar droppings from exposed edges of any installed insulation boards.
  3. Offer the K8 Cavity Board to the external face of the internal leaf and secure in place using thewall ties and retaining disc / clip.
  4. Ensure wall ties include a retaining disc / clip and be of the double drip type, installed drip downward.
  5. The outer leaf is then built up to the level of the top of the boards and the process is repeated.
  6. Ensure that a residual cavity of at least 40 mm is maintained in accordance with the moisture penetration provisions set out inthe masonry structures standard

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Frequently Asked Questions

What is Kooltherm?

The Kingspan Kooltherm range is an extensive range of high performance rigid thermoset phenolic insulation for roofs, walls and floors.


Kingspan Kooltherm offers among the most thermally efficient conductivity and thermal performance values available, which means you can minimise the thickness of your insulation compared to other conventional insulation to achieve the same performance.


Kingspan Kooltherm also has exceptional fire performance characteristics. As it is a thermoset material, it hardens and chars in fire situations, giving off very little smoke; unlike thermoplastics, such as polystyrene which melt, soften, and give off thick black smoke.

What is phenolic insulation?

Phenolic insulation, like our Kooltherm range of products, is the most thermally efficient insulation commonly used. It is made through a manufacturing process where a rigid thermoset foam forms an insulating core between two facing elements, for example, a low emissivity composite foil.


Choosing a phenolic insulation will make it easier to reach those high target R-values with a minimal thickness of insulation.

Are Kingspan insulation boards affected by water or moisture?

Our Kooltherm and Therma ranges are closed-cell types of insulation. This type of insulation is resilient to the occasional light sprinkle of water but should always be kept and stored in dry conditions to maximise its thermal performance.


In cases where insulation is expected to get wet or where it is to be installed outside any tanking membrane, we recommend using Kingspan GreenGuard, which isn’t negatively affected by groundwater or moisture.

Why is a 40mm cavity needed in a double brick cavity wall for K8 cavity board?

The masonry standard AS 3700 states ‚Äúin cavity walls and masonry veneer walls, cavities with a minimum width of 40mm, which are properly detailed and constructed, shall be regarded as being resistant to the passage of moisture‚ÄĚ.
Kingspan recommends a maintained 40 mm cavity in all cavity walls to reduce the risk of moisture penetration that can lead to structural damage, poor thermal performance, and health hazards.

What is the difference between Kooltherm & Therma?

Kooltherm is a range of advanced phenolic insulation. It is the thinnest commonly used insulation board for any specific R-value. This means that you can benefit from reduced heating or cooling demand or use thinner boards to gain more space in your building.


Therma is a range of PIR insulation boards. 

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