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Kooltherm Pipe Insulation

Kingspan Kooltherm offers the thinnest and most thermally efficient pipe insulation available as a foil faced phenolic foam.

Thermal Conductivity 0.025 W/m·KBL,s1,d0 Fire RatingFoil Vapour BarrierClosed‑Cell Phenolic Foam-50°C to +110°C

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15mm Wall Thick Kooltherm

15mm Thick Foil Faced Kingspan Kooltherm Pipe Insulation

20mm Wall Thick Kooltherm

20mm Thick Foil Faced Kingspan Kooltherm Pipe Insulation

25mm Wall Thick Kooltherm

25mm Thick Foil Faced Kingspan Kooltherm Pipe Insulation

K-Stop Passive Fire Protection

K‑Stop passive fire protection range with intumescent wraps, collars, mastics and batts

For a full range of pipe insulation lagging we have available,

see our Pipe Lagging & Pipe Insulation category.

Performance Benefits


  • Ultra‑low thermal conductivity

Helps reduce heat loss and improve system efficiency across heating, cooling and HVAC applications.

  • High performance with reduced thickness

Achieves required insulation values with noticeably thinner sections, ideal for tight service zones.

  • Consistent performance across a wide temperature range

Suitable for warm, cold and low‑temperature systems without compromising thermal efficiency.

  • Factory‑applied foil vapour barrier

Supports condensation control on chilled and cold‑water pipework when installed correctly.

  • Excellent dimensional stability

Rigid phenolic core maintains shape for a clean, uniform finish along pipe insulation runs.


Practical & Installation Benefits


  • Lightweight and fibre‑free

Easy to handle and cut, with no fibres released during installation.

  • Suitable for a wide range of services

Heating, HVAC, chilled water, refrigeration, ASHP pipework and specialist low‑temperature systems.

  • Space‑saving in congested areas

Reduced thickness helps avoid clashes in risers, plantrooms and ceiling voids.

  • Supports long‑term energy efficiency

Durable construction and vapour barrier help maintain performance over the product’s service life.

  • Part of the Kingspan Kooltherm family

Backed by Kingspan’s established phenolic insulation technology and technical documentation.

Specification

PropertyValue
MaterialPremium performance rigid phenolic foam insulation with aluminium foil vapour barrier facing
Thermal ConductivityAs low as 0.025 W/m·K at 10°C (EN 14314)
Fire PerformanceReaction to Fire: B/B L‑s1,d0 to EN 13501‑1; Class 1/A rating to ASTM E84
Temperature RangeService temperature limits: −50°C to +110°C (typical)
Closed‑Cell Content≥ 95% (EN ISO 4590)
Compressive StrengthTypically exceeds 100 kPa at 10% compression (EN 826)
Water Vapour ResistanceFactory‑applied aluminium vapour barrier foil with very low transmission (<0.1 g/m²·24h)
Length1,000 mm standard pipe section length
Available Thicknesses15 mm to 150 mm depending on application (cut to suit)
CertificationsFM Approved (FM 4924); CE marked to EN 14314; Manufactured under ISO 9001, ISO 14001, ISO 45001, ISO 50001 systems
Environmental PerformanceZero ODP, low GWP; EPD available; BRE Green Guide rating A/A+

Frequently Asked Questions

What is Kingspan Kooltherm Pipe Insulation?+

Kingspan Kooltherm is a high-performance phenolic foam pipe insulation designed to deliver exceptionally low thermal conductivity. It provides a rigid, fibre-free solution suitable for heating, HVAC, chilled water and low-temperature services.

What thermal conductivity does Kooltherm achieve?+

Kooltherm offers one of the lowest thermal conductivity values available in commonly used pipe insulation materials. Exact λ-values vary by thickness and are listed in the official Kingspan datasheet.
📄 Download the datasheet

Does Kooltherm include a vapour barrier?+

Yes. Kooltherm pipe sections are supplied with a factory-applied foil vapour barrier designed to help manage condensation risk when installed correctly.

What fire rating does Kooltherm have?+

Kooltherm® Pipe Insulation is classified Euroclass BL‑s1,d0 to BS EN 13501‑1:2018 when installed with the foil vapour barrier facing the heat source, for pipework up to 300 mm outer diameter.

What sizes and thicknesses does Kooltherm come in?+

Kooltherm is available in a wide range of bore sizes, typically from 15mm to 300mm, with insulation thicknesses commonly between 15mm and 50mm. Download the Quick Guide for more information.
📏 Kooltherm Quick Guide

Is Kooltherm suitable for external pipework?+

Kooltherm can be used externally when protected with appropriate weatherproof jacketing such as aluminium, PIB sheeting or suitable cladding systems. Always follow Kingspan’s installation guidance.
🛡️ View jacketing options

Is Kooltherm fibre-free?+

Yes. Kooltherm is manufactured using a rigid, fibre-free phenolic foam core, offering a clean and stable insulation solution.

Can Kooltherm be cut to length?+

Yes. Kooltherm pipe sections can be cut to length using standard insulation tools. For best results, follow the manufacturer’s installation instructions.
🛠️ View installation guide

Page last updated April 2026