Building a camper van from scratch requires careful consideration of every component. One crucial decision involves choosing the right plumbing system for your mobile home. When it comes to water lines, PEX tubing has become the go-to choice for van builders. However, not all PEX is created equal. Understanding the differences between PEX-A and PEX-B can save you time, money, and frustration down the road. Many builders turn to resources from Outlander Campervans to guide their van conversion projects.
Understanding PEX Tubing Basics
PEX stands for cross-linked polyethylene. This flexible plastic tubing revolutionized residential plumbing and has become equally popular in van builds. Unlike rigid copper or PVC pipes, PEX can bend around corners and fit into tight spaces. This flexibility makes it ideal for the confined quarters of a camper van. Additionally, PEX resists freezing better than metal pipes and costs significantly less than traditional materials.
The manufacturing process determines whether PEX becomes type A or type B. Both types serve the same purpose but differ in their physical properties. These differences matter when you’re working in the unique environment of a van conversion. Moreover, diy camper van construction requires materials that can withstand constant movement and temperature fluctuations.
What Makes PEX-A Different
PEX-A uses a manufacturing method called the Engel or peroxide method. This process creates cross-links during the manufacturing stage while the polyethylene is in its amorphous state. The result is the most flexible type of PEX available. You can bend PEX-A into extremely tight curves without kinking. This flexibility proves invaluable when routing water lines through narrow gaps between wall panels and insulation.
Furthermore, PEX-A has superior freeze resistance. If water freezes inside PEX-A tubing, the material can expand without bursting. Once thawed, the tubing returns to its original shape. This memory effect makes PEX-A particularly forgiving for van builders who plan to camp in cold climates. The tubing can also be repaired using expansion fittings that create leak-free connections.
The Characteristics of PEX-B
PEX-B undergoes cross-linking through a moisture cure or silane method. This happens after the tubing has been extruded into its final shape. The process makes PEX-B slightly stiffer than PEX-A. While it still offers good flexibility, it requires more effort to bend around tight corners. According to the Plastic Pipe and Fittings Association, PEX-B remains a reliable choice for various plumbing applications.
However, PEX-B costs less than PEX-A. This price difference can be significant when you’re working with a tight budget. PEX-B also works with crimp-style fittings, which are less expensive than expansion fittings. The stiffer nature of PEX-B can actually be an advantage in some situations. It holds its shape better when running long, straight sections of pipe.
Installation Considerations for Van Builds
Installing plumbing in a camper van presents unique challenges. Space is at a premium, and every component must be secured against constant vibration. PEX-A’s flexibility allows you to snake it through tight spaces with minimal fittings. Fewer fittings mean fewer potential leak points. Therefore, many professional van builders prefer PEX-A for complex routing situations.
On the other hand, PEX-B requires more planning. You need to account for its larger bend radius when designing your plumbing layout. However, the crimp fittings used with PEX-B are straightforward to install. You only need a crimping tool and ring cutter. PEX-A expansion fittings require a specialized expansion tool that costs more upfront.
Cost Comparison and Budget Impact
Budget plays a major role in any van conversion project. PEX-B tubing typically costs 20 to 30 percent less than PEX-A. For a complete van plumbing system, this could mean savings of fifty to one hundred dollars. Additionally, the crimp fittings for PEX-B are cheaper than expansion fittings.
Nevertheless, consider the tool costs. A basic PEX-B crimping tool costs around thirty dollars. An expansion tool for PEX-A starts at about one hundred fifty dollars. However, if you value flexibility and freeze resistance, the extra investment might be worthwhile. Many builders find that the ease of working with PEX-A saves time, which also has value.
Temperature Performance in Mobile Living
Camper vans experience dramatic temperature swings. A van parked in the desert can reach over 120 degrees Fahrenheit inside. Conversely, winter camping can expose your plumbing to below-freezing temperatures. Both PEX-A and PEX-B handle heat well, with maximum operating temperatures around 200 degrees Fahrenheit.
The real difference shows up in freezing conditions. PEX-A’s expansion capability provides an extra safety margin. Even with proper insulation, unexpected freezes can happen. PEX-B can also handle some freezing, but it’s less forgiving. Therefore, builders planning extensive winter travel often lean toward PEX-A.
Durability and Long-Term Reliability
Both types of PEX tubing are designed to last decades in residential applications. However, van life introduces additional stress factors. Constant vibration from driving can potentially loosen fittings over time. PEX-A’s flexibility helps absorb some of this vibration. The expansion fittings create strong connections that resist movement.
PEX-B with crimp fittings also performs well when properly installed. The key is ensuring every crimp is correctly made. A properly crimped connection should last the life of the tubing. According to Family Handyman, both systems can provide reliable service when installed correctly.
Which Type Should You Choose
Your choice between PEX-A and PEX-B depends on several factors. Consider your budget, the complexity of your plumbing layout, and your expected camping conditions. If you have a complex build with many tight turns, PEX-A makes the job easier. Its flexibility reduces installation time and frustration.
However, if you’re working with a tight budget and have a simpler layout, PEX-B offers excellent value. The money saved on materials and tools can be invested elsewhere in your build. Many successful van conversions use PEX-B without any issues. The slightly reduced flexibility is manageable with proper planning.
Practical Tips for Installation
Regardless of which type you choose, proper installation is critical. Always use the correct fittings and tools for your chosen PEX type. Never mix and match systems. Plan your entire plumbing layout before cutting any tubing. This prevents waste and ensures you have enough material.
Secure your plumbing lines every few feet to prevent rattling while driving. Use cushioned clamps to avoid chafing. Leave some slack in the lines to accommodate van body flex. Insulate all water lines to prevent freezing and reduce condensation. Test your entire system thoroughly before closing up walls.
Conclusion
Choosing between PEX-A and PEX-B tubing for your camper van comes down to weighing flexibility against cost. PEX-A offers superior flexibility, freeze resistance, and ease of installation in tight spaces. However, it requires a larger initial investment in both materials and tools. PEX-B provides a budget-friendly alternative that works well for simpler layouts and builders who plan carefully.
Both types of tubing have proven themselves in countless van conversions. Your decision should align with your specific build requirements, budget constraints, and camping plans. By understanding the strengths and limitations of each option, you can make an informed choice that serves you well throughout your van life adventures.
Frequently Asked Questions
Can I use PEX-A fittings with PEX-B tubing?
No, you cannot mix PEX types and fittings. PEX-A requires expansion fittings, while PEX-B uses crimp or clamp fittings. Using the wrong combination will result in leaks and potential system failure.
How much PEX tubing do I need for a typical camper van?
Most camper van plumbing systems require between 30 to 50 feet of tubing. This includes hot and cold water lines from your tank to the sink, shower, and any other fixtures. Always buy extra to account for mistakes and future modifications.
Does PEX tubing need to be insulated in a camper van?
Yes, insulating your PEX lines is highly recommended. Insulation prevents freezing in cold weather and reduces condensation in humid conditions. It also helps maintain water temperature in your hot water lines.
Can PEX tubing be exposed to sunlight in my van?
No, PEX should not be exposed to direct sunlight for extended periods. UV rays degrade the tubing over time. Always run PEX lines inside walls, cabinets, or other protected areas. If temporary exposure is necessary, use UV-resistant sleeving.
How long does PEX tubing last in a camper van?
When properly installed and protected, PEX tubing should last 25 to 50 years. The constant movement and temperature fluctuations in a van may reduce this slightly, but PEX remains one of the most durable plumbing options for mobile applications.
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