Underground Odyssey: Exploring the Uncharted Waters of PEX Pipe’s Durability

PEX (Polyethylene Cross-linked) pipe has gained immense popularity in plumbing due to its flexibility, durability, and resistance to corrosion. However, its suitability for underground applications remains a topic of debate. This blog post delves into the intricate world of PEX pipe and explores its capabilities and limitations when buried beneath the earth’s surface.

Understanding PEX Pipe

PEX pipe is a type of plastic tubing manufactured using a cross-linking process that enhances its strength and resilience. It is commonly used in residential and commercial plumbing systems for hot and cold water distribution. However, its suitability for underground applications depends on several factors, including:

• Type of PEX Pipe: There are different types of PEX pipe, each with its own properties and applications. PEX-a and PEX-b are flexible and suitable for cold water lines, while PEX-c is more rigid and can handle higher temperatures. For underground applications, PEX-a or PEX-b is typically recommended due to its flexibility.

• Soil Conditions: The soil conditions where the pipe will be buried play a crucial role in its performance. Sandy or clay soils with good drainage are generally suitable for PEX pipe. However, in areas with heavy or rocky soil, the pipe may be susceptible to damage.

• Depth of Burial: The depth at which the pipe is buried also affects its longevity. PEX pipe should be buried at least 18 inches below the frost line to prevent freezing damage in cold climates.

Advantages of Using PEX Pipe Underground

• Corrosion Resistance: PEX pipe is highly resistant to corrosion, making it an ideal choice for underground applications where metal pipes are prone to rust and deterioration.

• Flexibility: PEX pipe’s flexibility allows it to conform to the contours of the soil, reducing the risk of damage from ground movement or shifting.

• Longevity: PEX pipe has a long lifespan of up to 50 years, providing a durable solution for underground plumbing.

Considerations for Underground PEX Pipe Installation

• Protective Casing: To ensure the longevity of the pipe, it is recommended to use a protective casing when installing PEX pipe underground. This casing can be made of PVC or HDPE (High-Density Polyethylene) and provides additional protection from soil pressure, rocks, and other potential hazards.

• Proper Burial Depth: As mentioned earlier, PEX pipe should be buried at least 18 inches below the frost line to prevent freezing damage.

• Avoid Direct Sunlight: UV rays can degrade PEX pipe over time. Therefore, it is crucial to bury the pipe underground or protect it from direct sunlight using a UV-resistant coating.

Alternative Options for Underground Plumbing

While PEX pipe can be a suitable option for certain underground applications, there are alternative materials that may be more appropriate in certain circumstances:

• HDPE Pipe: HDPE pipe is another type of plastic pipe that is highly durable and resistant to corrosion. It is often used for larger diameter underground pipelines.

• Copper Pipe: Copper pipe is a traditional choice for underground plumbing due to its strength and durability. However, it is more expensive than PEX pipe and can be susceptible to corrosion in certain soil conditions.

• Galvanized Steel Pipe: Galvanized steel pipe is a cost-effective option for underground applications. However, it is prone to rust and corrosion over time.

Takeaways: Navigating the Underground Labyrinth

Whether PEX pipe can be used underground is not a straightforward yes or no answer. It depends on a multitude of factors, including the type of PEX pipe, soil conditions, depth of burial, and installation practices. By understanding these factors and taking appropriate precautions, such as using protective casing and burying the pipe at the correct depth, PEX pipe can be a viable solution for certain underground plumbing applications.

What You Need to Learn

Q: Can PEX pipe be used for sewer lines?
A: No, PEX pipe is not suitable for use in sewer lines due to its inability to withstand the high temperatures and pressures associated with wastewater.

Q: How long will PEX pipe last underground?
A: Properly installed PEX pipe can last up to 50 years or more underground, provided it is protected from UV rays and other potential hazards.

Q: Can PEX pipe be used in areas with freezing temperatures?
A: Yes, PEX pipe can be used in areas with freezing temperatures if it is buried below the frost line and protected from direct sunlight.