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50mm Kingspan Kooltherm K108 Cavity Insulation Board 1200mm x 450mm (5.4m2/Pack)

URN: 3002084
£116.31ex. VAT £11.63 per Board
£116.31ex. VAT
£11.63 per Board
Bulk Discount
6+ packs 9+ packs 15+ packs
£115.73ex. VAT £115.15ex. VAT £114.57ex. VAT
Coverage required
m
m
Based on your total area of m2 (inc. 10% wastage) - of these are required (actual coverage of m2)

We recommend purchasing at least 10% extra product to allow for errors, damages or obstacles

50mm Kingspan Kooltherm K108 is a phenolic insulation board designed to offer premium thermal performance whilst maintaining a clear cavity and resisting moisture in partial-fill cavity wall applications.

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Mon 11 Aug

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Product Overview

50mm Kingspan Kooltherm K108 is a phenolic insulation board designed to offer premium thermal performance whilst maintaining a clear cavity and resisting moisture in partial-fill cavity wall applications.

URN: 3002084
£116.31ex. VAT

Delivery & Returns Information

How Our Delivery Works

We work with a nationwide network of trusted suppliers. As a result, items in your basket may be supplied by different suppliers and delivered separately. Where this applies, you'll see multiple delivery charges at checkout. We always aim to group products from the same supplier to keep delivery costs as low as possible.

Delivery Areas & Charges

Delivery charges listed on our website apply to mainland UK, excluding the following postcode areas: AB, CF, DD, DG, KW, IV, LA, LD, LL, NP, PH, SA, SY
If your delivery address falls within one of these postcode areas, we’ll be in touch before processing your order to confirm any additional delivery costs.
Please note: We do not currently offer delivery outside the UK mainland.

Standard (Nationwide) Delivery

Insulation, Plasterboard and Drylining Products
ORDER VALUE DELIVERY CHARGE
Under £150 £40 ex. VAT
Between £150 - £350 ex. VAT £35 ex. VAT
Over £350 ex. VAT FREE
Timber & Sheet, Building Materials, Joinery and Gardens & Landscaping Products
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Under £100 £15 ex. VAT
Between £100 - £200 ex. VAT £10 ex. VAT
Over £200 ex. VAT FREE
Screws & Fixings and Adhesives & Sealants
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Under £100 £7.50 ex. VAT
Over £100 ex. VAT FREE

Express Delivery

Express Delivery - Insulation and Plasterboard & Drylining
ORDER VALUE DELIVERY CHARGE
Under £400 £50 ex. VAT
Over £400 ex. VAT £35 ex. VAT
Express Delivery - Timber & Sheet, Building Materials, Joinery and Gardens & Landscaping Products
ORDER VALUE DELIVERY CHARGE
Under £300 £50 ex. VAT
Over £300 ex. VAT £35 ex. VAT

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Returns

We offer a 30 day returns policy on any faulty products.

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Key Features

  • {{home}} Rigid partial fill cavity wall insulation
  • {{device_thermostat}} Fibre-free rigid thermoset phenolic core
  • {{add_task}} Low thermal conductivity of 0.019 W/mK 
  • {{balance}} Lightweight yet rigid

Technical Specification

Technical Specification
Product:K108
Material Type:Phenolic
Thickness:50mm
Width:450mm
Length:1200mm
Pieces Per Pack:10
Sales Unit:Pack
Sales Unit Coverage:5.4m2
Brand:Kingspan
Weight:10.58kg
Thermal Conductivity:0.018W/mK
Facing:Composite Foil
Application:Partial Fill Cavity Wall Insulation
Status:Non-Returnable

What Is 50mm Kingspan Kooltherm K108?

50mm Kingspan Kooltherm K108 is developed for use as a partial-fill solution in masonry cavity walls. It contains a rigid phenolic core that is free from fibres and delivers a thermal conductivity of 0.019 W/mK across all available thicknesses.

Each board is cut to a size of 1200mm x 450mm, which fits standard wall tie spacings. This format simplifies installation and helps reduce gaps that can cause heat loss. 

With foil facings on both sides, the boards improve thermal resistance within the cavity while providing resistance to moisture and allowing limited vapour movement.

Applications

Kingspan K108 50mm is intended specifically for use in masonry cavity wall constructions as a partial-fill solution. It is commonly specified for:

  • New build residential housing
  • Extensions
  • Refurbishment projects


It is not suitable for use in floors, roofs, or solid wall applications. Boards are installed between the two masonry leaves, leaving a residual air gap to prevent moisture bridging.

Benefits

  • Thermal conductivity of 0.019 W/mK
  • Rigid, fibre-free phenolic core
  • Manufactured at 1200mm x 450mm for wall tie alignment
  • Lightweight and simple to install compared to some other commonly used insulants
  • Air infiltration resistant, supporting strong overall thermal performance
  • Moisture-resistant with vapour-permeable foil facings


Though phenolic insulation typically has a higher cost than PIR or EPS, its thermal efficiency allows for thinner wall constructions without compromising performance - making it a sound investment for energy-focused projects.

Performance Standards

Kingspan Kooltherm K108 is manufactured under a management system certified to:

  • ISO 9001:2015 (Quality Management Systems)
  • ISO 14001:2015 (Environmental Management Systems)
  • ISO 37301:2021 (Compliance Management Systems)
  • ISO 45001:2018 (Occupational Health & Safety Management Systems)
  • ISO 50001:2018 (Energy Management Systems)


Environmental Considerations

Kingspan Kooltherm K108 produced at Kingspan’s Pembridge, Herefordshire facility is certified to BES 6001 rating of 'Good'.

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