RockLap H&V Pipe Section

Install ROCKWOOL’s pipe insulation around chilled water pipes, wastewater, and pipework. 

Pipe lagging helps prevent condensation, slows down freezing of pipe contents when temperatures drop and can prevent water being transported at low temperatures from heating up. 

Our pipe insulation products are suitable for both domestic and commercial use, whether you are working on a retrofit project or a new construction.

Learn more about ROCKWOOL’s pipe insulation products and the expertise, support, and resources we offer to our customers.

The benefits of cold pipe insulation 

We all know that cold pipe insulation offers a range of benefits. 

As well as keeping pipes that transport water at a low temperature, ensuring a consistent and reliable supply of cold water, stone wool pipe lagging can:

  • Help maintain the integrity of compartmentation in fire stopping - suppressing the spread of fire throughout a building
  • Minimise noise by being acoustically absorbent
  • Prevent condensation from forming with the aluminium foil acting as a vapour barrier
  • Prevent freezing of pipe contents over a set period
  • Create energy savings by reducing heat gain, which reduces wasted water.

Building regulations for insulating cold pipework

BS 5422:2023 guides designers, specifiers, contractors, and manufacturers of thermal insulation, helping them determine the minimum insulation thickness required to control and reduce heat loss and gains from building services. It also covers the importance of insulating pipes and ductwork to maintain the integrity of compartmentation in fire stopping. 

Architects and specifiers face a significant challenge keeping up with ever-evolving regulations and guidance documents to ensure full compliance and construct buildings that withstand the test of time.

However, we’re here to help and support you with CPD learning modules and advice from our team of experts to help you specify the right product to comply with the regulations, as and when they change. 

 Find out more:


Refer to and use BS 5422 to meet the requirements outlined in the following guidance:

Cold Pipe Insulation Products

Why do we need cold pipe insulation?

Insulation for cold piping can help to keep pipes that transport cool air and drinking water at their desired low temperature.

When these pipes travel through hot areas of a construction with little or no protection, the contents inside can soon warm up. This is especially true during intense periods of warm weather or in the hottest climates, when they are needed the most. Such temperature increases impair their effectiveness. 

By installing effective insulation, less money needs to be spent powering air conditioning, cold water and ventilation in a building, in order to cool down its occupants. 

It also helps minimise the carbon footprint of a construction, creating an environmentally friendly way of maintaining a healthy indoor climate.

Calculator and savings

Adding effective insulation around cold pipes can result in significant energy savings. This is because it acts to lower the amount needed to cool businesses, properties and operations, providing a cost-effective way to cut carbon emissions caused by excess cooling1.

For our HVAC RockLap range, we have also created an easy to use calculator tool for working out the required insulation thickness.

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Installing our solutions to prevent piping from heating up can provide one of the best returns on investment, especially when trying to reduce building energy costs and carbon footprints.

Rob Kooiker

ROCKWOOL Group Product Manager
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HVAC Systems Guide

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HVAC Specification Guide

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RockLap H&V Pipe Section Packaging Guide

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Thickness of ROCKWOOL Insulation

Download our HVAC Systems Guide

Financial support

Check the Energy Savings Trust website to see whether there are any financial support schemes available for cold pipe insulation.

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