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50mm Kingspan Kooltherm K108 Cavity Insulation Board 1200mm x 450mm (5.4m2/Pack)
| 6+ packs | 9+ packs | 15+ packs |
| £115.73ex. VAT | £115.15ex. VAT | £114.57ex. VAT |
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- Choose Clearpay at checkout to pay later with Pay in 4.
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Product Overview
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, PA, 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 £350 | £35 ex. VAT |
| Over £350 ex. VAT | FREE |
| Timber & Sheet, Building Materials, Joinery and Gardens & Landscaping Products | |
| ORDER VALUE | DELIVERY CHARGE |
| Under £100 | £15 ex. VAT |
| Over £100 ex. VAT | FREE |
| Screws & Fixings and Adhesives & Sealants | |
| ORDER VALUE | DELIVERY CHARGE |
| Under £50 | £5 ex. VAT |
| Over £50 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 |
Returns
We offer a 30 day returns policy on any faulty products.
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
| 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 |
Technical Downloads
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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