Kingspan Kooltherm Pipe Insulation
Kingspan Kooltherm Pipe Insulation — Premium Phenolic Pipe Lagging
Kingspan Kooltherm is the UK's leading phenolic pipe insulation, offering the lowest thermal conductivity of any mainstream pipe insulation product. Its rigid closed-cell phenolic foam core delivers outstanding thermal performance in a thinner wall section — making it the preferred choice where space is limited or where maximum energy efficiency is required.
Pipelagging.com stocks the full Kingspan Kooltherm range for trade and public customers with fast UK delivery.
Kingspan Kooltherm Product Range
- Kooltherm Pipe Insulation — Pre-formed phenolic foam pipe sections with a foil facing. Available in a comprehensive range of bore sizes and wall thicknesses to meet Part L and TIMSA guidelines. Lambda value: 0.021 W/mK.
- Kingspan K-Roc Pipe Insulation — Mineral fibre pipe insulation for high-temperature applications including steam, hot water and industrial process pipework. Non-combustible, suitable for temperatures up to 750°C.
- Kingspan Thermoduct — Rigid phenolic insulation boards for ductwork and building fabric insulation applications.
Why Choose Kingspan Kooltherm?
- Lowest lambda value of any mainstream pipe insulation — typically 0.021 W/mK
- Thinner wall thickness for the same thermal performance — ideal for confined spaces and service voids
- Rigid pre-formed sections for fast, accurate installation
- Suitable for chilled water, cold water, heating and district heating systems
- Meets and exceeds Part L Building Regulations and TIMSA guidelines
- BBA certified and widely specified by M&E consultants
- Foil-faced for vapour control and a clean finish
Kooltherm vs Armaflex vs Rockwool — Which Should You Choose?
| Factor | Kingspan Kooltherm | Armaflex EVO | Rockwool Rocklap |
|---|---|---|---|
| Material | Phenolic foam (rigid) | Elastomeric rubber (flexible) | Mineral wool (rigid) |
| Lambda value | 0.021 W/mK (lowest) | 0.034 W/mK | 0.033–0.040 W/mK |
| Fire classification | Class O | Class O | Euroclass A1 (non-combustible) |
| Max temperature | Up to +120°C | Up to +105°C | Up to +750°C |
| Vapour resistance | High | Very high (closed-cell) | Low |
| Wall thickness needed | Thinnest | Medium | Thicker |
| Best for | Space-limited installs, district heating, chilled water | HVAC, refrigeration, condensation control | Steam, high-temp, fire-rated specs |
Kooltherm is the correct choice when insulation thickness must be minimised without compromising thermal performance — particularly in service voids, ceiling spaces and district heating applications.
Common Applications
- District heating flow and return pipework
- Chilled water pipework in commercial buildings
- Hot water services where space is restricted
- Mechanical services in ceiling voids and service risers
- LTHW and MTHW heating systems
- Pipework requiring Part L or TIMSA compliance with minimum thickness
Compliance & Standards
- Part L (Building Regulations) — Kooltherm meets and exceeds minimum insulation thickness requirements for heating and hot water pipework
- TIMSA Guidelines — Thermal Insulation Manufacturers and Suppliers Association guidance for mechanical services insulation
- BS 5422 — Method for specifying thermal insulating materials for pipes, tanks, vessels and ductwork
- BBA Certified — British Board of Agrément certification for performance and durability
Browse by Pipe Size
Kingspan Kooltherm is available for all standard pipe sizes. Select your bore size below:
15mm | 22mm | 28mm | 35mm | 42mm | 54mm | 76mm | 108mm
Related Collections
- All Pipe Insulation
- Armaflex Pipe Insulation
- Rockwool Pipe Insulation
- Condensation Control Pipe Insulation
Frequently Asked Questions
What is Kingspan Kooltherm pipe insulation?
Kingspan Kooltherm is a rigid phenolic foam pipe insulation with a foil facing. It has the lowest thermal conductivity (lambda value) of any mainstream pipe insulation product — typically 0.021 W/mK — allowing thinner wall sections to achieve the same thermal performance as thicker conventional insulation. It is BBA certified and widely specified by M&E engineers.
Why is Kooltherm better than standard pipe insulation?
Kooltherm's phenolic foam core has a significantly lower lambda value than elastomeric foam or mineral wool insulation. This means you can achieve the same thermal performance with a thinner wall section — critical in applications where space in ceiling voids, service risers or plant rooms is restricted.
What is the lambda value of Kingspan Kooltherm?
Kingspan Kooltherm pipe insulation has a declared lambda value of 0.021 W/mK — the lowest of any mainstream pipe insulation product available in the UK. For comparison, Armaflex EVO has a lambda value of 0.034 W/mK and Rockwool Rocklap is typically 0.033–0.040 W/mK.
Does Kingspan Kooltherm comply with Part L?
Yes. Kingspan Kooltherm meets and exceeds Part L minimum insulation thickness requirements for heating and hot water pipework. Its low lambda value means thinner sections can achieve compliance compared to standard insulation products. Our technical team can advise on the correct thickness for your application.
Is Kooltherm suitable for chilled water pipework?
Yes. Kooltherm is suitable for chilled water and cold pipework applications. Its foil facing provides vapour control, and the rigid phenolic foam core delivers excellent thermal performance. For applications with very high vapour resistance requirements, consult our technical team.
What is the difference between Kooltherm and K-Roc?
Kooltherm is a phenolic foam pipe insulation with the lowest lambda value, ideal for applications where insulation thickness must be minimised. K-Roc is a mineral fibre (stone wool) pipe insulation suitable for high-temperature applications up to 750°C, including steam and industrial process pipework. Both are manufactured by Kingspan.
Technical Support
Our technical team can advise on Kooltherm product selection, insulation thickness calculations and compliance with Part L, TIMSA and BS 5422. Call 0161 775 1190 (Mon–Fri 8am–4pm) or use our online enquiry form.
