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Dew Point Explained for Pipe Insulation
What Is Dew Point?Dew point is the temperature at which moisture in the air begins to condense into liquid water. When a surface — such as a cold pipe or the outer face of pipe insulation — falls below the dew point temperature of the surrounding air, condensation forms.For pipe insulation, dew point is not an abstract concept. It is the critical threshold that determines whether your insulation system will perform correctly or fail prematurely.Why Dew Point Matters for Pipe InsulationOn cold pipework — including chilled water systems, cold water... Read more...
How to Prevent Condensation on Cold Pipes
Why Cold Pipes SweatCondensation on cold pipes is not a sign of a leaking pipe — it is atmospheric moisture condensing on a surface that has fallen below the dew point of the surrounding air. The colder the pipe and the more humid the environment, the greater the condensation risk.Left unaddressed, condensation causes corrosion, saturates building fabric, promotes mould growth and significantly increases energy consumption on chilled water and refrigeration systems.The solution is correctly specified and installed pipe insulation with an effective vapour barrier.Which Pipes Are at Risk?Any pipework operating... Read more...
Condensation on Refrigerant Pipework
Why Refrigerant Lines Are High RiskRefrigerant suction lines operate at some of the lowest temperatures found in building services pipework — typically between -10°C and +10°C depending on the refrigerant and system operating conditions. In a typical UK plant room or roof-mounted installation, the pipe surface temperature can be 20–30°C below the ambient air temperature.At these temperatures, condensation is not a risk — it is a certainty unless the insulation system is correctly specified and installed. The dew point of typical UK ambient air at 20°C and 60% relative humidity... Read more...
Air Source Heat Pump Pipe Insulation Guide
Introduction Air source heat pumps (ASHPs) rely on correctly insulated pipework to deliver their designed efficiency, prevent condensation, protect outdoor services, and comply with UK installation requirements. Because a heat pump operates across several different temperature ranges, no single insulation material or thickness is suitable for every pipe on the system. For a complete overview of heat pump pipe insulation, visit our Heat Pump Pipe Insulation Hub. This guide explains how to specify insulation for the heating flow and return, domestic hot water pipework, refrigerant lines, outdoor connections, valves, fittings,... Read more...
Outdoor Pipe Insulation for Heat Pumps
Introduction The outdoor pipe run between the heat pump unit and the building is one of the most critical and most frequently misspecified sections of a heat pump installation. Exposed to UV radiation, rain, frost, and temperature cycling, standard pipe insulation materials will degrade rapidly — often within 12–24 months — if the wrong product is specified. For a complete overview of heat pump pipe insulation, visit our Heat Pump Pipe Insulation Hub. This guide covers the correct materials, installation methods, and compliance requirements for outdoor heat pump pipe insulation... Read more...
Heat Pump Pipe Insulation — BS 5422 & MCS Requirements
Introduction Every heat pump installation in the UK that claims the Boiler Upgrade Scheme (BUS) grant must be MCS-certified. MCS certification requires all pipework to be insulated in accordance with BS 5422 and the heat pump manufacturer's installation manual — and building control sign-off under Part L of the Building Regulations requires the same. For a complete overview of heat pump pipe insulation, visit our Heat Pump Pipe Insulation Hub. This guide explains exactly what BS 5422 and MCS require for heat pump pipe insulation, how to demonstrate compliance, and... Read more...
Heat Pump Refrigerant Line Insulation
Introduction The refrigerant lines on an air source heat pump are the most technically demanding pipework to insulate on any domestic or light commercial installation. The suction line operates at temperatures well below ambient — creating significant condensation risk — while the discharge line operates at high temperatures that can exceed the rating of standard insulation materials. For a complete overview of heat pump pipe insulation, visit our Heat Pump Pipe Insulation Hub. This guide covers the correct insulation specification for heat pump refrigerant lines — suction line, discharge line,... Read more...
Ground Source Heat Pump Pipe Insulation Guide
Introduction Ground source heat pumps (GSHPs) extract heat from the ground via a buried loop of pipework filled with a water-glycol mixture (brine). The brine circuit operates at temperatures close to or below freezing — creating condensation and frost risks that require careful insulation specification on the above-ground sections of the system. For a complete overview of heat pump pipe insulation, visit our Heat Pump Pipe Insulation Hub. This guide covers the correct insulation specification for every pipe on a ground source heat pump installation — brine flow and return,... Read more...
42mm Pipe Insulation Guide: Sizes, Materials & Wall Thickness
42mm Pipe Insulation Guide: Sizes, Materials & Wall Thickness
Everything you need to know about 42mm pipe insulation — materials, wall thickness selection, BS 5422 compliance and installation advice from the UK's specialist pipe insulation supplier. Read more...
Boiler Plant Room Pipe Insulation.
Boiler Plant Room Pipe Insulation.
The boiler plant room is where pipe insulation is most frequently undersized or left incomplete. This guide covers the correct insulation products for commercial boiler plant rooms in the UK,... Read more...
Domestic Hot Water (DHW) Pipe Insulation — Part L, BS 5422 & Legionella Guidance
Domestic Hot Water (DHW) Pipe Insulation — Part L, BS 5422 & Legionella Guidance
Insulating domestic hot water pipework reduces energy bills, improves hot water delivery speed and is required under Part L of the Building Regulations. This guide covers the correct insulation products... Read more...
Phenolic vs Mineral Wool Pipe Insulation — Which for Commercial Heating?
Phenolic vs Mineral Wool Pipe Insulation — Which for Commercial Heating?
Phenolic foam and mineral wool are the two most widely specified pipe insulation materials for commercial heating in the UK. This guide compares Kingspan Kooltherm and Rockwool Rocklap on thermal... Read more...
Pipe Insulation for District Heating Systems — Complete UK Guide
Pipe Insulation for District Heating Systems — Complete UK Guide
District heating pipework operates at temperatures and heat loss requirements that demand specialist insulation specification. This guide covers the correct insulation products for above-ground district heating pipework in the UK,... Read more...
Armaflex Self-Seal vs Standard Pipe Insulation — Which Should You Use?
Armaflex Self-Seal vs Standard Pipe Insulation — Which Should You Use?
Armaflex self-seal and standard (solid) pipe insulation are the same foam in two different formats — but the right choice depends on your application, pipe configuration and installation speed requirements.... Read more...
Pipe Insulation for Steam Pipework — Complete UK Guide
Pipe Insulation for Steam Pipework — Complete UK Guide
Steam pipework operates at temperatures that rule out most standard pipe insulation materials. This guide covers the correct insulation products for steam systems in the UK, including mineral wool and... Read more...
Armaflex HT vs Armaflex EVO — What’s the Difference?
Armaflex HT vs Armaflex EVO — What’s the Difference?
Armaflex EVO and Armaflex HT look almost identical but are specified for very different applications. This guide explains the key technical differences, when each product is correct, and the consequences... Read more...
Pipe Insulation for Solar Thermal Systems — Complete UK Guide
Pipe Insulation for Solar Thermal Systems — Complete UK Guide
Choosing the wrong pipe insulation for solar thermal systems is one of the most common installation mistakes in the UK. This guide explains why Armaflex HT is the only correct... Read more...
Pipe Insulation Glossary — Complete Reference Guide
Pipe Insulation Glossary — Complete Reference Guide
A complete A–W glossary of pipe insulation terms covering lambda value, mu value, BS5422, closed-cell foam, vapour barriers, elastomeric foam, phenolic foam, mineral wool, and all key products and standards... Read more...
Foil-Faced vs Elastomeric Foam Pipe Insulation — Which Should You Choose?
Foil-Faced vs Elastomeric Foam Pipe Insulation — Which Should You Choose?
Foil-faced phenolic foam (Kooltherm) and closed-cell elastomeric foam (Armaflex EVO) both provide vapour barriers for cold pipe applications, but work differently. This guide compares the two types and explains when... Read more...
Pipe Insulation for Swimming Pools — Complete UK Guide
Pipe Insulation for Swimming Pools — Complete UK Guide
Swimming pool plant rooms require specialist pipe insulation specification due to extreme humidity (80%+) and high ambient temperatures. This guide covers Armaflex EVO specification, indicative thicknesses for pool conditions, and... Read more...
How to Cut and Install Pipe Insulation — Complete UK Guide
How to Cut and Install Pipe Insulation — Complete UK Guide
Step-by-step guide to cutting and installing pipe insulation correctly — covering elastomeric foam, polyethylene foam, and mineral wool for straight runs, bends, tees, valves, and fittings. Includes common mistakes and... Read more...
Pipe Insulation for Cold Water Systems — Complete UK Guide
Pipe Insulation for Cold Water Systems — Complete UK Guide
Cold water pipe insulation prevents condensation, protects against freezing, and supports legionella risk management. This guide covers material selection, BS5422 thicknesses, Water Regulations requirements, and installation for every common UK... Read more...
Pipe Insulation for Domestic Heating — Complete UK Guide
Pipe Insulation for Domestic Heating — Complete UK Guide
Pipe insulation for domestic heating reduces heat loss, cuts energy bills, and is required by Part L for notifiable work. This guide covers materials, BS5422 thicknesses, pipe size selection, and... Read more...
Phenolic Foam Pipe Insulation — Complete UK Guide (Kingspan Kooltherm)
Phenolic Foam Pipe Insulation — Complete UK Guide (Kingspan Kooltherm)
Phenolic foam pipe insulation (Kingspan Kooltherm) achieves BS5422 compliance at the thinnest wall thicknesses of any pipe insulation material. This guide covers properties, applications, BS5422 thicknesses, vapour barrier integrity, and... Read more...
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