Nationwide 48 Hour Delivery*
Unbeaten on Price!
Expert Help & Guides
Fast, Secure, Checkout
Kingspan Kooltherm K108 Phenolic Cavity Insulation Board (All Sizes) 1200mm x 450mm
Kingspan Kooltherm K108 Phenolic Cavity Insulation Board (All Sizes) 1200mm x 450mm

Kingspan Kooltherm K108 Phenolic Cavity Insulation Board (All Sizes) 1200mm x 450mm

  • Cavity Wall Insulation
  • Kingspan

  • Free Next Day Delivery (over £500) in the West Midlands
  • Free Standard Delivery (over £500)
  • View our guides for Help & Advice
 (   Ex. VAT) £121.20
 - £169.20
All prices are including VAT

Select an option to add this to your cart

🚛 Next Day Delivery (West Midlands) – FREE on orders over £500

Offering a versatile and efficient solution for energy-efficient walls, Kingspan Kooltherm K108 is a high performance cavity wall insulation with an impressively low thermal conductivity of 0.019 W/mK.  

Its premium rigid thermoset, fibre-free phenolic insulation core, and low emissivity composite foil on both sides, effectively combats thermal bridging and uncontrolled air leakage at junctions in cavity wall constructions. The low thermal conductivity can also help to increase usable internal floor space.   

 Easy to handle and install, Kooltherm K108 Cavity Board maintains a clear cavity, is moisture-resistant and remains unchanged by air filtration, enhancing the overall thermal performance of your property.  


  • Partial fill cavity walls 
  • Roofs 
  • Floors 
  • Lofts  

Storage: Ideally inside. If must be stored outside, cover with a weatherproof sheet and stack clear of the ground.  

Installation: Refer to the product brochure below. 


  • Thermal conductivity: 0.019 W/mK 
  • Premium rigid thermoset   
  • Fibre-free phenolic insulation core   
  • Low emissivity composite foil on both sides   
  • Increase internal floor space  
  • Lightweight and easy to install   
  • Resistant to moisture and mould  
  • Maintains a clear cavity 
  • Non-deleterious material 
  • Long-lasting  
  • Unaffected by air filtration  
  • Fire rating: F 
  • Dimensions: 450mm x 1200 mm  


DISCLAIMER: Please make sure this product meets fire safety regulations for your project.

About the Manufacturer

As the global leader in advanced insulation and building envelope solutions, Kingspan is committed to driving towards a net-zero emissions future while prioritising both human and environmental wellbeing. With an extensive range of innovative products, Kingspan offers solutions tailored to diverse needs, from low thermal conductivity to Euroclass A1 fire-rated protection. Through relentless innovation, Kingspan delivers thinner, lighter, and higher-performing solutions, setting new industry standards. 

You may also like…

Frequently Asked Questions

The Kingspan Kooltherm K108 Cavity Board is specifically designed for use in partially filled cavity walls, offering versatility and effective thermal insulation solutions for various construction applications. 

The low emissivity foil facings not only enhance thermal resistance but also significantly contribute to energy efficiency by reducing heat transfer through radiation. This helps to improve overall building performance.

Yes, this cavity board can be used alongside other insulation products whatever size you choose, whether it’sKingspan Kooltherm K108 100mm, Kingspan Kooltherm K108 50mm, or another size.

Be sure to follow recommended guidelines and consult with professionals to ensure compatibility and to achieve optimal insulation performance. Get in touch with our team for expert assistance and guidance. 

Yes, the KoolthermK108 Cavity Board is designed for easy installation. This ensures convenience for construction professionals and ensures efficient insulation application on site.

Free shipping will automatically be applied to all orders over £500. Simply add over £500 to your cart and you will see the discount while checking out.

Orders under £500 - £50 charge.
Over £500 is free.

We typically deliver orders within 2-3 business days of ordering.

Orders for the West Midlands will be completed in 1 to 2 working days.

Orders for areas out of the West Midlands will be completed in 3 to 4 working days.

Orders made after 5pm will be processed on the following working day.

Our deliveries are typically made between 8am and 5pm, Monday - Friday excluding Bank Holidays (Great Britain).

We are unable to offer timed deliveries.

Popular brands we supply

You recently viewed…