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Kingspan Kooltherm K103 Floor Insulation (All Sizes) 1200mm x 2400mm
Kingspan Kooltherm K103 Floor Insulation (All Sizes) 1200mm x 2400mm
Kingspan Kooltherm K103 Floor Insulation (All Sizes) 1200mm x 2400mm
Kingspan Kooltherm K103 Floor Insulation (All Sizes) 1200mm x 2400mm

Kingspan Kooltherm K103 Floor Insulation (All Sizes) 1200mm x 2400mm

  • Kingspan

  • Free Next Day Delivery (over £500) in the West Midlands
  • Free Standard Delivery (over £500)
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 (   Ex. VAT) £376.80
 - £651.60
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🚛 Next Day Delivery (West Midlands) – FREE on orders over £500

Kingspan Kooltherm K103 is your go-to floor insulation solution for beam and block, solid concrete or suspended timber floors. Featuring a fibre-free rigid thermoset phenolic core (with a density of 35kg/m3), this insulation comes equipped with a glass tissue-based facing on both sides for a secure bond. Made with a blowing agent, Kooltherm K103 floorboards have a low thermal conductivity of 0.019 W/mK across all thicknesses, and stands out for its exceptional thermal performance. The insulation core and facings resist mould and microbial growth while providing no food value to vermin.  

Additionally, the CFC and HCFC-free insulation core is resistant to short-term contact with petrol, dilute acids, alkalis, and mineral oils.  


  • Beam and block floors  
  • Solid concrete floors  
  • Timber floors 


Storage: Stacked on a flat surface, in a cool and dry environment. If outside, cover with weatherproofing materials.  

Installation: Refer to the product brochure below.


  • Thermal conductivity: 0.019 W/mK 
  • Fibre-free rigid thermoset phenolic core  
  • Glass tissue-based facing on both sides   
  • Ideal for use in underfloor heating systems   
  • Lightweight and easy to install   
  • Water vapour resistant   
  • Suitable for new and refurbishment projects   
  • Highly durable   
  • Fire rating: C-s2,d0 
  • Compressive strength: 120kPa at 10% compression. 
  • Low vapour resistance  
  • Indefinite life if correctly applied  
  • Dimensions: 2400 x 1200 


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. 

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Frequently Asked Questions

Kingspan Kooltherm K103 Floorboard is a high-performance insulation solution featuring a fibre-free rigid thermoset phenolic core. Specifically designed for insulating beam and block, concrete, and timber floors, it offers exceptional thermal performance and durability.

Kooltherm K103 Floorboard is specifically designed for insulating a variety of floors, including beam and block, concrete, and timber floors. Its versatility and superior thermal properties make it a preferred choice for both residential and commercial construction projects.

Each side of the floorboard is meticulously faced with a glass tissue-based material, which is bonded to the insulation core during the manufacturing process. This ensures a secure and durable bond which enhances the overall performance of the insulation.

Kooltherm K103 is manufactured under rigorous quality management systems, including ISO 9001:2015 for quality management, ISO 14001:2015 for environmental management, ISO 45001:2018 for occupational health and safety, and ISO 50001:2018 for energy management.

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.

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