In the world of plumbing and heating, innovation often comes in the form of new materials that are more durable, flexible, and easier to install. One such advancement that has steadily gained favor among professionals and DIY enthusiasts alike is PEX-AL-PEX pipe. This composite tubing offers a unique combination of the benefits of both plastic and metal pipes, making it a versatile choice for a variety of applications.
PEX-AL-PEX is a multi-layered pipe composed of an inner and outer layer of cross-linked polyethylene (PEX) with a thin layer of aluminum sandwiched in between. These layers are bonded together with an adhesive. This construction creates a pipe that is both strong and flexible, with some distinct advantages over standard PEX or traditional copper and steel pipes.
The hybrid nature of PEX-AL-PEX gives it a unique set of characteristics that make it ideal for specific jobs.
Form Stability: Unlike standard PEX which has a "memory" and tends to coil back to its original shape, PEX-AL-PEX holds its form when bent. This is a significant advantage during installation, as it can be easily routed and will stay in place with fewer fasteners. For both professionals and DIYers, this means a neater, quicker, and more secure installation.
Built-in Oxygen Barrier: The aluminum layer in PEX-AL-PEX acts as an effective oxygen barrier. This is crucial in closed-loop heating systems, such as radiant floor heating or hydronic baseboards. By preventing oxygen from entering the system, it inhibits the corrosion of ferrous metal components like cast iron pumps and boilers, extending the life of the entire system.
Low Thermal Expansion: PEX-AL-PEX expands and contracts less with temperature changes compared to standard PEX. Its thermal expansion rate is closer to that of copper, which means less stress on the pipe and fittings over time, leading to a more stable and durable system.
High-Pressure and Temperature Ratings: This composite pipe can handle high pressures and temperatures, making it suitable for a wide range of hot and cold water applications.
While standard PEX is a popular choice for general plumbing, the unique properties of PEX-AL-PEX make it particularly well-suited for:
Installing PEX-AL-PEX is generally straightforward, but it does require specific tools and fittings. Unlike standard PEX that often uses crimp or clamp rings, PEX-AL-PEX typically utilizes compression or press fittings. These fittings are designed to create a secure seal on the multi-layered pipe. When cutting PEX-AL-PEX, it's important to use a dedicated pipe cutter to ensure a clean, square cut and then ream the inside of the pipe to prevent damage to the fitting's O-rings. We have a wide selection of fittings and couplings for you to choose from.
For many applications, especially those involving heating systems, the advantages of PEX-AL-PEX are hard to ignore. Its combination of rigidity, flexibility, and a built-in oxygen barrier can lead to a more professional and long-lasting installation. While the initial cost may be slightly higher than standard PEX, the long-term benefits and ease of installation often make it a worthwhile investment for both contractors and savvy homeowners. Feel free to explore more PEX pipes that suit your speficic applications
