Tubolit Pipe Insulation
Tubolit Pipe Insulation — Armacell Polyethylene Foam Pipe Lagging
Tubolit is Armacell's range of polyethylene foam pipe insulation — one of the most widely used pipe lagging products in the UK for domestic plumbing, heating and hot and cold water services. Lightweight, easy to install and cost-effective, Tubolit is the go-to choice for plumbers, heating engineers and DIY installers across the country.
Pipelagging.com is an authorised UK distributor for Armacell. All Tubolit products are genuine manufacturer stock supplied with full technical data sheets.
Tubolit Product Range
- Tubolit DG — Standard pre-slit polyethylene foam pipe insulation for domestic hot and cold water pipes, central heating pipework and general plumbing applications. Available in 1m lengths in a wide range of bore sizes and wall thicknesses.
- Tubolit DG Box Quantities — The same Tubolit DG product available in trade box quantities for larger projects. Significant savings over individual lengths.
- Tubolit DG Self-Seal — Pre-slit pipe insulation with a factory-applied self-adhesive closure strip for faster installation. No tape required — simply press to close. Ideal for retrofit and maintenance work.
Why Choose Tubolit?
- One of the UK's best-selling pipe insulation products
- Lightweight and easy to cut and install
- Available in all standard copper and plastic pipe sizes
- Cost-effective solution for Part L compliance on domestic pipework
- Pre-slit for quick installation — no specialist tools required
- Manufactured by Armacell, the world's leading pipe insulation brand
Tubolit vs Armaflex — Which Should You Choose?
Both Tubolit and Armaflex are manufactured by Armacell, but they serve different applications.
| Application | Tubolit DG | Armaflex EVO |
|---|---|---|
| Material | Polyethylene foam (open-cell) | Elastomeric rubber (closed-cell) |
| Fire rating | Class 1 | Class O |
| Vapour resistance | Low | High |
| Condensation control | Not suitable | Excellent |
| Temperature range | 0°C to +95°C | -50°C to +105°C |
| Best for | Domestic hot & cold water, heating | HVAC, chilled water, refrigeration |
| Cost | Lower | Higher |
For domestic plumbing and heating pipework where condensation control is not required, Tubolit is the most cost-effective choice. For commercial HVAC, chilled water or refrigeration pipework, Armaflex EVO is the correct product.
Common Applications
- Domestic hot and cold water pipes (Part L compliance)
- Central heating flow and return pipework
- Boiler pipework and connections
- Underfloor heating pipework
- General plumbing insulation in lofts, voids and unheated spaces
- Frost protection on exposed domestic pipework
Shop by Pipe Size
Tubolit is available for all standard copper and plastic pipe sizes. Select your pipe size below:
15mm | 22mm | 28mm | 35mm | 42mm | 54mm
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Frequently Asked Questions
What is Tubolit pipe insulation?
Tubolit is a polyethylene foam pipe insulation manufactured by Armacell. It is one of the most widely used pipe lagging products in the UK, commonly specified for domestic hot and cold water pipes, central heating pipework and general plumbing applications. It is pre-slit for easy installation and available in a wide range of bore sizes and wall thicknesses.
What sizes does Tubolit come in?
Tubolit is available for all standard copper and plastic pipe sizes from 10mm to 114mm bore, in wall thicknesses of 9mm, 13mm, 19mm and 25mm. Standard lengths are 1m. Contact our team if you need sizes not shown online.
Does Tubolit comply with Part L?
Yes. Tubolit can be specified to meet Part L minimum insulation thickness requirements for domestic hot and cold water services. The required thickness depends on pipe size and location — our technical team can advise on the correct specification for your project.
Can Tubolit be used outdoors?
Standard Tubolit is not UV-resistant and will degrade if left exposed to sunlight outdoors. For external pipework, use a UV-resistant product such as Armaflex HT Solar, or protect Tubolit with a suitable cladding system. See our outdoor pipe insulation collection.
What is the difference between Tubolit and Armaflex?
Tubolit is an open-cell polyethylene foam, making it a cost-effective choice for domestic plumbing and heating. Armaflex is a closed-cell elastomeric rubber with higher vapour resistance and a wider temperature range, making it the correct choice for HVAC, chilled water and refrigeration applications. Both are manufactured by Armacell.
How do I install Tubolit pipe insulation?
Tubolit is pre-slit along its length. To install, open the slit, place it around the pipe and press closed. For standard Tubolit, secure with insulation tape at joints and ends. For Tubolit Self-Seal, the factory-applied adhesive strip closes the slit without additional tape. Cut to length with a sharp knife or scissors.
Technical Support
Need help choosing the right Tubolit product or wall thickness for your project? Call our technical team on 0161 775 1190 (Mon–Fri 8am–4pm) or use our online enquiry form.
