What to Know About Insulated Multilayer Pex-Al-Pex Pipe – Featu

  • You may not know much about pex-al-pex fittings. Well, it is widely approved in major plumbing codes, comes with various features, and is easier to use. They usually come in rolls, so there is no need for soldering, and can be cut to any length and combined with joint fittings.

    Whether you plan to perform plumbing projects on your own or with any expert assistance, these insulated multilayer pipes are a feasible choice for any application. It takes the best advantage of chemical and corrosion resistance of plastic and pressure potential of metal by coating aluminum layer between plastic layers.

    In this comprehensive guide, we will talk more about pex-al-pex pipes and fitting to broaden your scope of understanding. Let’s begin!

    What is Pex-Al-Pex Pipe?

    Pex-Al-Pex 16mm got their name for a sandwiched-layered structure that encompasses polyethylene plastic (PEX) for the outside layer, Al for aluminum, and another layer of polyethylene plastic (PEX) for the inner layer. The finished product is flexible, non-corroding, and resistant to oils, salt solutions, fats, and alkalis.

    Key Features:

    • Simple joint assembly – mainly made with either crimp-on connector rings or compression fittings. Such joints are easy and quick to finish.
    • Flexibility – can be easily bent using hands in any direction and stay in a fixed position. It allows you to work around frame members, walls, and floor joists. 
    • Resistant to frost cracking – pex-al-pex pipes are better than rigid piping when resisting the pressure of freezing water


    Pex-al-pex tubing is commonly used in outdoor heating systems and high-temperature systems like fan coils and baseboards. These pipes start to grow in popularity with radiator heating systems and since then, are considered ideal for all plumbing and mechanical applications. They are used for various applications that include:

    • Hot and cold-water plumbing distribution – both residential and commercial
    • Radiant heating and cooling applications – including ceilings, walls, and floors
    • Outdoor ice and snow melting
    • Chilled water piping
    • Pitch heating 
    • Hydronic piping and distribution

    Pex-Al-Pex vs Other Ultrasound Overlapped Multilayer Pipes

    Unlike other ultrasound overlapped multilayer pipes, pex-al-pex is welded fused with aluminum sheet, which results in high resistance of welding line to any other series of alumni layer. Ultrasound pipes’ aluminum doesn’t melt and forms welding, and, in some situations, the aluminum sides may fall apart. 

    Pex-al-pex pipes offer high safety in the long-term and resistance to corrosion, tuberculation, tough, and durable to survive through complex installations. Aluminum layers can prevent oxygen from permeating into the pipe and offer flexibility to retain its shape. All these advantages make pex-al-pex pipes a viable option for brass manifold and underfloor heating systems.


    When using pex-al-pex pipes, you can reap significant advantages, such as easy transport, lightweight, high durability, corrosion resistance, less thermal expansion, flexibility yet can retain its form, and reliability in the long-term. It is approved across all plumbing and mechanical codes, ideal for plumbing, underfloor heating, snow/ice melting systems, and turf conditioning.

    It is always advised to do your research and understand all crucial facts when planning to install pex-al-pex in any plumbing application.