Can You Bury PEX Pipe?

PEX (cross-linked polyethylene) pipes are renowned for their flexibility, durability, and resistance to corrosion. They have become a popular choice for plumbing and heating systems in residential and commercial applications. However, a common question among builders and homeowners is whether PEX pipes can be buried underground. This article delves into the technical details, real-world examples, and best practices for burying PEX pipes.

What is PEX Pipe?

PEX pipe is a type of plastic pipe used in plumbing systems. It’s known for its:

• Flexibility: Allows for easy installation and fewer fittings.

• Durability: Resistant to scaling, chlorine, and corrosion.

• Thermal Resistance: Can handle both hot and cold temperatures.

PEX pipe comes in various types, including PEX-A, PEX-B, and PEX-C, each with different properties suited to specific applications. PEX-A is known for its superior flexibility and resistance to kinking, while PEX-B is more resistant to higher pressures and is less expensive.

Can You Bury PEX Pipe?

Yes, PEX pipe can be buried underground, but there are important considerations to ensure its longevity and performance:

1. Pipe Protection: PEX pipe should be protected from physical damage and UV exposure. When burying PEX pipe, it's crucial to use a protective sleeve or conduit to shield it from mechanical impact and harsh environmental conditions.

2. Temperature Tolerance: PEX pipe is designed to withstand a range of temperatures. However, it’s essential to ensure that the pipe is buried below the frost line in colder climates to prevent freezing and potential damage.

3. Depth Requirements: The depth at which PEX pipes should be buried depends on local building codes and environmental conditions. Typically, PEX pipes are buried at least 18 inches to 24 inches deep, but this can vary.

Technical Details of Burying PEX Pipe

• Frost Line Considerations: In colder regions, PEX pipes need to be buried below the frost line to avoid freeze-thaw cycles that can cause pipe bursts. The frost line depth varies by location, so checking local building codes is crucial.

• Pipe Insulation: Insulating PEX pipes with foam or other insulating materials can provide extra protection against extreme temperatures. This is particularly important in regions with harsh winters.

• Pipe Bedding: PEX pipes should be laid on a bed of sand or fine soil to avoid direct contact with rocks or other sharp objects that could damage the pipe.

• Trench Backfill: After placing the pipe, backfill the trench with soil that is free from large rocks or debris. Compacting the soil helps prevent settling and potential damage to the pipe.

Real-World Examples

1. Residential Water Supply

In many residential settings, PEX pipes are used for water supply lines buried underground. For instance, in a new housing development in Minnesota, PEX pipes were buried 24 inches below the surface to prevent freezing during harsh winters. The installation included protective conduit to safeguard the pipes from soil movement and potential mechanical damage.

2. Agricultural Applications

PEX pipes are also used in agricultural settings for irrigation systems. In a farm in California, PEX pipes were buried 18 inches deep to deliver water efficiently to various crop areas. The flexible nature of PEX allowed for easy installation around obstacles and reduced the need for extensive fittings.

3. Commercial Heating Systems

In commercial heating systems, PEX pipes are used for radiant floor heating systems. In a shopping mall in the UK, PEX pipes were installed below the concrete slab and buried under insulation material. This setup ensured efficient heat distribution and protection from potential damage.

Pros and Cons of Burying PEX Pipe

Pros

• Flexibility: PEX’s flexibility allows for easy installation in various soil conditions.

• Corrosion Resistance: Unlike metal pipes, PEX does not corrode, which extends its lifespan underground.

• Cost-Effective: PEX is generally less expensive than traditional metal pipes.

Cons

• Physical Damage: Without proper protection, PEX can be susceptible to physical damage from rocks or heavy machinery.

• UV Sensitivity: Prolonged exposure to UV light can degrade PEX, so it must be protected if not buried immediately.

Best Practices for Installing PEX Pipe Underground

1. Use a Protective Sleeve: Encasing PEX pipes in a protective sleeve or conduit can prevent damage from soil movement and mechanical impacts.

2. Follow Local Codes: Always adhere to local building codes and regulations for depth and installation requirements.

3. Inspect Before Burial: Check PEX pipes for any signs of damage before installation.

4. Avoid Freezing Conditions: In colder climates, ensure pipes are buried below the frost line and consider additional insulation.

   
   

PEX pipes can be buried underground effectively, provided proper precautions and best practices are followed. Their flexibility and resistance to corrosion make them a viable option for various applications. By ensuring protection against physical damage and adhering to local regulations, PEX pipes can offer a reliable solution for underground plumbing needs.

Ready to upgrade your plumbing with PEX pipes? Contact us today to learn more about our high-quality PEX pipes and how they can meet your needs. Don’t miss out on the benefits of flexible, durable, and cost-effective piping solutions!