Underground Plumbing Revolution: Can You Use PEX Pipe Below the Surface?
What To Know
- The world of plumbing materials is constantly evolving, and one of the most recent innovations is PEX piping, a flexible, durable, and corrosion-resistant material that is quickly gaining popularity.
- PEX pipe should be buried at a depth of at least 18 inches to protect it from freezing and damage caused by surface loads.
- Once the PEX pipe is installed, conduct a pressure test to verify the integrity of the system and identify any potential leaks or weaknesses.
The world of plumbing materials is constantly evolving, and one of the most recent innovations is PEX piping, a flexible, durable, and corrosion-resistant material that is quickly gaining popularity. However, one question that often arises is whether PEX pipe can be used underground. This blog post delves into the intricacies of this topic, providing comprehensive answers and expert insights.
Understanding PEX Pipe
PEX, or cross-linked polyethylene, is a type of plastic tubing that is manufactured using a process that creates strong molecular bonds between the polymer chains. This results in a material that is highly resistant to heat, pressure, and chemicals, making it an excellent choice for various plumbing applications.
Can You Use PEX Pipe Underground?
The short answer is yes, you can use PEX pipe underground. However, it is essential to follow specific guidelines and precautions to ensure the longevity and proper functioning of the piping system.
Considerations for Underground PEX Piping
1. Depth and Burial Conditions:
PEX pipe should be buried at a depth of at least 18 inches to protect it from freezing and damage caused by surface loads. The trench should be free of sharp objects and rocks that could puncture the pipe.
2. UV Protection:
PEX pipe is susceptible to degradation when exposed to ultraviolet (UV) radiation. Therefore, it is crucial to protect the pipe from direct sunlight by burying it or wrapping it with UV-resistant tape or conduit.
3. Pressure Rating:
The pressure rating of the PEX pipe used underground should be sufficient to withstand the hydrostatic pressure exerted by the surrounding soil and water.
4. Backfill Material:
The backfill material used to cover the PEX pipe should be free of rocks, debris, and other sharp objects that could damage the pipe. Sand or compacted soil is recommended as suitable backfill materials.
5. Trench Preparation:
Before installing the PEX pipe, the trench should be properly prepared by removing any large rocks, roots, or other obstacles that could interfere with the pipe’s installation or functionality.
Installation Best Practices
1. Use High-Quality PEX Pipe:
Choose PEX pipe manufactured according to industry standards, such as ASTM F876 or ASTM F877, to ensure durability and reliability.
2. Secure the Pipe Properly:
Use appropriate clamps, supports, and anchors to secure the PEX pipe in place and prevent movement or damage during backfilling.
3. Pressure Test the System:
Once the PEX pipe is installed, conduct a pressure test to verify the integrity of the system and identify any potential leaks or weaknesses.
Advantages of Using PEX Pipe Underground
- Corrosion Resistance: PEX pipe is highly resistant to corrosion, making it an ideal choice for underground applications where exposure to moisture and chemicals is unavoidable.
- Flexibility: The flexibility of PEX pipe allows for easy installation around obstacles and in tight spaces, reducing the need for multiple fittings and connections.
- Durability: PEX pipe is resistant to cracking, splitting, and bursting, providing a long-lasting and reliable solution for underground plumbing.
- Cost-Effective: Compared to traditional piping materials such as copper or galvanized steel, PEX pipe can be more cost-effective due to its ease of installation and reduced labor costs.
Disadvantages of Using PEX Pipe Underground
- UV Susceptibility: As mentioned earlier, PEX pipe is susceptible to degradation when exposed to UV radiation, necessitating proper protection measures during installation.
- Temperature Limitations: PEX pipe has a maximum operating temperature of 180°F (82°C), which may limit its use in certain high-temperature applications.
- Potential for Kinking: If not installed properly, PEX pipe can be prone to kinking, which can restrict water flow and damage the pipe.
Final Thoughts: Embracing PEX Pipe for Underground Plumbing
While PEX pipe can be used underground, it is essential to adhere to specific guidelines and installation best practices to ensure its longevity and proper functioning. By understanding the considerations and advantages of using PEX pipe underground, you can confidently navigate the complexities of plumbing projects and make informed decisions for your specific needs.
Information You Need to Know
Q: What is the best PEX pipe for underground use?
A: Look for PEX pipe manufactured according to ASTM F876 or ASTM F877 standards, which are designed for underground applications.
Q: How deep should I bury PEX pipe underground?
A: Bury PEX pipe at least 18 inches deep to protect it from freezing and surface loads.
Q: Can I use PEX pipe for both hot and cold water underground?
A: Yes, PEX pipe is suitable for both hot and cold water applications underground.
Q: How do I protect PEX pipe from UV radiation underground?
A: Wrap the PEX pipe with UV-resistant tape or conduit before burying it to prevent degradation from sunlight.
Q: Is it necessary to pressure test PEX pipe after installation?
A: Yes, conducting a pressure test is crucial to verify the integrity of the system and identify any potential leaks or weaknesses.
