Phenolic Kooltherm Insulation
Phenolic insulation boards provide extremely high thermal performance while keeping build-ups slim, making them ideal where space is limited or demanding U-values must be achieved. The Kingspan Kooltherm range offers specialist solutions for floors, roofs and cavity walls across both new build and refurbishment projects.
Discover Our Full Product Range:
| Brand | Product | Sheet Size |
| Kingspan | Kooltherm K106 | 0.45m x 1.2m |
| Kingspan | Kooltherm K103 | 2.4m x 1.2m |
| Kingspan | Kooltherm K107 | 2.4m x 1.2m |
What is phenolic insulation?
Phenolic insulation is a rigid foam insulation material known for delivering some of the highest thermal performance available in board form. It allows excellent insulation values to be achieved with thinner boards compared to many other insulation types.
Most common applications
- Solid and suspended floor insulation
- Pitched roof insulation
- External masonry cavity walls
- Timber frame construction
- High-performance building specifications
Why choose phenolic insulation
- Exceptional thermal efficiency
- Slim build-ups where space is restricted
- Lightweight rigid board format
- Suitable for demanding U-value targets
- Ideal for both new build and retrofit
Popular brands
- Kingspan Kooltherm
- Xtratherm Thin-R
- Unilin Safe-R
- Quinn Therm
FAQ’s:
What makes phenolic insulation different from PIR?
Phenolic insulation typically offers higher thermal performance, meaning thinner boards can achieve the same U-value compared to PIR insulation.
Where is Kooltherm insulation commonly used?
It is widely used in floors, roofs and cavity walls, particularly where space is limited or higher thermal performance is required.
Is phenolic insulation suitable for new builds and refurbishments?
Yes, it is suitable for both and is often specified for projects requiring high levels of energy efficiency.
Can you help me choose the right Kooltherm board?
Yes — if you tell us your application and build-up, our team can help you select the most suitable board for your project.