How to Replace Old Copper Wiring with PEX Tubing

Overview of Replacing Copper Wiring with PEX Tubing

Replacing old copper wiring with PEX tubing can modernize your home's plumbing system and provide a range of benefits. PEX (cross-linked polyethylene) is a flexible plastic tubing that is increasingly used in residential plumbing systems due to its durability, leak resistance, and cost effectiveness compared to copper piping.

I will walk through the entire process of replacing copper with PEX step-by-step, covering planning considerations, materials needed, installation instructions, and tips for a successful project. Properly replacing copper with PEX requires some plumbing knowledge and experience, so beginners may want to hire a professional to avoid mistakes. However, with the right preparation, a DIYer can take on this project and enjoy the advantages of PEX.

Reasons to Switch from Copper to PEX

There are several compelling reasons I chose to replace the old copper plumbing in my home with new PEX tubing:

• Cost savings - PEX is cheaper than copper piping and can reduce overall project costs. The flexible tubing is faster to install compared to rigid copper pipes.

• Durability - PEX tubing is highly durable and resistant to corrosion. It can last over 50 years without leaks or failure.

• Ease of installation - PEX does not require soldering so it's simpler for DIYers to install. The flexible tubing can maneuver around obstacles easily.

• Reduced leaks - PEX has fewer connections and does not corrode, so it is less prone to leaks than copper over time. Leaks can cause major water damage.

• Improved water flow - PEX has a smooth interior that allows for increased water flow compared to copper's rougher interior surface.

• Resistance to freeze damage - PEX tubing is more resistant to damage if water freezes inside compared to copper pipes.

Clearly, PEX offers a range of benefits over traditional copper plumbing. While copper served homes well for decades, PEX improves upon it in some key ways.

Planning the PEX Replacement Project

Careful planning and preparation ensures the PEX installation project goes smoothly and the new plumbing system works effectively for years to come. Here are some key steps to plan out:

• Map out existing copper plumbing - Note the location of all supply lines, fixtures, valves, and more. This provides an outline for designing the new PEX layout.

• Calculate the needed materials - Measure the required lengths and diameters of PEX tubing and order the right amount of fittings, valves, hangers, and crimp tools.

• Determine a piping layout - Decide on an efficient design for running the PEX throughout the home. Consider a home-run or trunk-and-branch system.

• Schedule time - Budget several days to a week for a DIYer to fully replace copper with PEX. Be aware of home occupant needs.

• Obtain permits - Check with local permit authorities to see if a plumbing permit is required for replacing copper with PEX piping.

Taking time to thoroughly plan the project will ensure you have all the skills, materials, and time needed to successfully install a new PEX plumbing system.

Necessary Materials and Tools

Replacing copper wiring with PEX tubing requires gathering the right supplies. Here are the key materials and tools I needed for my plumbing system upgrade:

• PEX tubing - in the required diameters (e.g. 1/2", 3/4") and length. PEX is red and blue to distinguish hot and cold lines.

• PEX fittings - elbows, tees, adapters and more to connect PEX segments. I used crimp fittings.

• PEX support hangers - to mount tubing to studs or joists. Stainless steel hangers are sturdy.

• Crimp tool and go/no go gauge - ensures proper crimp of PEX fittings. Use the gauge to test crimps.

• Tubing cutter - cleanly cuts PEX tubing to length. A PEX-specific cutter is ideal.

• Shutoff valves - shutoffs are needed at fixtures and to transition between PEX and copper.

• Primer and cement - bonds fittings and adapters to different types of pipes.

• Teflon tape - used to seal threaded fittings. Prevents leaks.

Gathering these necessary materials ahead of time prevents delays in the project timeline. Having the right tools for the job also makes the PEX installation process smooth.

Step-by-Step PEX Installation Guide

Once all the planning and prep work is complete, it's time to install the new PEX plumbing system. Follow these key steps:

1. Turn off the home's water supply - Locate the main shutoff valve and turn off the water to prevent leaks as you work.

2. Cut the copper pipes - Use a tubing cutter to cut the copper pipes where they will connect to PEX lines. Remove any old brazed fittings.

3. Install PEX manifold - Mount a PEX manifold near the main water lines to serve as the central distribution point. Secure to framing.

4. Run PEX lines - Run PEX tubing from the manifold using desired layout. Use hangers to properly secure to framing.

5. Install fittings - Place elbows, tees, adapters, and other fittings using crimp method. Test crimp with go/no gauge.

6. Connect fixtures - Cut PEX to length and connect pipes to all plumbing fixtures. Use adapter fittings as needed.

7. Attach shutoffs - Install shutoff valves near fixtures and where PEX connects to existing copper lines.

8. Pressure test - Cap all openings. Turn water on and test at 1.5-2 times working pressure. Fix any leaks.

9. Insulate - Use foam insulation on PEX lines in unheated areas to prevent freezing. Insulate hot water lines.

10. Flush system - Turn on fixtures and run water through all pipes to flush out any debris.

Following proper PEX installation procedures as provided by the manufacturer is crucial for getting leak-free performance. Take it slow and double check your work.

Tips for a Successful PEX Plumbing Upgrade

Here are some additional pointers to ensure an effective, problem-free copper to PEX plumbing transition:

• Label PEX lines - use colored tape to label hot and cold supply lines for easy identification.

• Use junction boxes - install j-boxes to protect connectors and allow easy access if needed.

• Slope pipes properly - slope PEX slightly to allow drainage and prevent freezing and leaks.

• **Avoid UV light ** - PEX tubing can become damaged and brittle if exposed to UV rays. Keep covered.

• Watch out for nails - be careful when securing walls and framing to avoid accidentally puncturing PEX lines.

• Hire a pro if needed - if you need help designing, troubleshooting, or installing PEX, hire a professional plumber.

• Maintain your system - periodically inspect PEX lines and fittings for any damage or leaks. Proactively replace worn parts.

Putting in the effort to learn how to properly replace copper wiring with PEX tubing is worthwhile. Follow this guide and suggestions to ensure you gain the benefits of improved water flow, reliability, and cost savings with a PEX plumbing system. Let me know if you have any other questions!