Why Is PEX Plumbing Bad? What Homeowners Need to Know
PEX plumbing has several drawbacks: it can develop pinhole leaks from chlorine degradation, is vulnerable to UV light and rodent chewing, and its mechanical fittings are a common leak point. Some insurance companies also view PEX as higher risk. However, it remains a popular, cost-effective option when installed correctly.
Why Is PEX Plumbing Bad? The Real Reasons, Explained
Pinhole leaks are the most common complaint about PEX. They occur when chlorine in treated water reacts with the pipe material over time, especially in PEX-b or PEX-c types. This degradation can cause tiny leaks that are hard to detect until water damage is done. The risk increases with hot water recirculation systems, which accelerate chemical breakdown.
Can a PEX pipe burst? Yes, but not from freezing like copper—PEX can expand and contract. However, if a PEX pipe freezes and thaws repeatedly, it can weaken and burst at fittings or along the pipe itself. Bursts are more likely with improper installation or if the pipe is not properly supported.
Why don't insurance companies like PEX pipe? Many insurers view PEX as a higher risk for sudden water damage, especially from failed fittings or pinhole leaks. Some policies exclude PEX-related claims or charge higher premiums. Always check with your provider before installing PEX.
Can mice chew through PEX pipe? Absolutely. Rodents are attracted to the plastic material and can gnaw through it, causing catastrophic leaks. Copper or steel pipes are rodent-resistant. In areas with known rodent activity, PEX should be protected with metal sleeves or avoided.
PEX leaking at connection is a frequent issue. Mechanical fittings like crimp rings or push-fit (SharkBite) connectors must be installed to exact specifications. Even a slight misalignment or incomplete crimp can cause a slow leak that worsens over time. Barrier PEX (with an oxygen barrier) is used for radiant heating, but if installed in a potable water system, it can cause corrosion in metal components.
PEX vs. Copper: Which Is Better for Your Home?
| Factor | PEX | Copper |
|---|---|---|
| Lifespan | 25–40 years (varies with water quality) | 50–80+ years |
| Freeze resistance | Expands, less likely to burst | Bursts easily if frozen |
| Rodent resistance | Low—can be chewed | High |
| UV sensitivity | Cannot be exposed to sunlight | UV-resistant |
| Leak risk at fittings | Higher (mechanical fittings) | Lower (soldered joints) |
| Cost (material + labor) | Lower (typically 30–50% less) | Higher |
| Installation difficulty | Easier for DIY, but requires precision | Requires professional skill |
For most homes in Rohnert Park, copper offers superior longevity and reliability, but at a higher upfront cost. PEX is a budget-friendly alternative that works well when installed correctly and protected from UV and rodents.
Is PEX Safe for Drinking Water? What About Leaching and Microplastics?
PEX pipe is NSF-certified for drinking water and does not contain BPA. However, studies have found that PEX can leach microplastics and trace chemicals, especially when new or exposed to hot water. The health effects of long-term ingestion are still being studied, but the levels are generally considered low.
If you are concerned about leaching, let the water run for a few seconds before drinking, especially after periods of non-use. Using a whole-house water filter can also reduce microplastic content. For peace of mind, copper or stainless steel pipes do not leach plastics.
Why Do PEX Fittings Leak? How to Identify and Fix the Problem
- Check the fitting type — Crimp, clamp, or push-fit? Each has a specific failure mode. Push-fit fittings (like SharkBite) can leak if the pipe isn't fully inserted or if the O-ring is damaged.
- Inspect the crimp ring — Use a go/no-go gauge to verify proper crimp. An under-crimped ring will leak over time.
- Look for pipe deformation — If the PEX pipe is oval or has burrs at the cut, it won't seal properly. Re-cut with a sharp pipe cutter.
- Test for slow leaks — Dry the area, then wrap with tissue paper. Run water and wait 10 minutes. Any moisture indicates a leak.
- Call a professional — If you find a leak, a licensed plumber can re-do the connection or replace the fitting. In Rohnert Park, our team offers same-day service for PEX repairs.
Directions to our plumber in Rohnert Park from Sonoma State Observatory
Start at Sonoma State Observatory and head to CNTRLine Plumbing at Rohnert Park, CA.
PEX Plumbing Pros and Cons: What Homeowners Should Know
| Pros | Cons |
|---|---|
| Flexible, easy to route through walls | Susceptible to UV damage—cannot be used outdoors |
| Resists freezing better than copper | Rodents can chew through it |
| Lower material and labor cost | Pinhole leaks from chlorine degradation |
| Fewer fittings needed (long coils) | Mechanical fittings are common leak points |
| Quiet—no water hammer noise | Some insurance companies view it as higher risk |
PEX is a good option for budget-conscious homeowners who can protect it from UV and rodents. However, for long-term reliability, many plumbers still prefer copper.
Can PEX Be Buried? UV Sensitivity and Outdoor Use Explained
PEX pipe is UV-sensitive and will become brittle and crack if exposed to sunlight for more than 30 days. It should never be used for outdoor exposed plumbing. For underground burial, PEX must be rated for direct burial (e.g., PEX with an oxygen barrier) and buried below the frost line. Even then, it is vulnerable to rodent damage and soil contaminants. In most cases, copper or PVC is a better choice for outdoor or buried applications.
PEX Pipe Lifespan and Repiping Costs: What to Expect
| Factor | Why It Matters | Typical Range |
|---|---|---|
| Pipe material (PEX-a, -b, -c) | PEX-a is more flexible and resistant to chlorine | Varies by type and brand |
| Water quality (chlorine, pH) | High chlorine accelerates degradation | Varies |
| Installation quality | Poor crimping or support leads to early failure | Varies |
| Home size (e.g., 2000 sq ft) | Larger homes require more pipe and labor | $4,000–$12,000 (varies widely) |
| Accessibility (crawlspace vs. slab) | Slab homes cost more to repipe | Varies |
PEX typically lasts 25–40 years, but repiping a house can cost several thousand dollars. For an accurate quote, contact a licensed plumber. We provide free quotes before any work begins.
Does PEX Pipe Affect Home Insurance? What You Need to Know
Some insurance companies view PEX as a higher risk for water damage claims, especially from pinhole leaks or failed fittings. This can lead to higher premiums or even denial of coverage for PEX-related damage. Before installing PEX, check with your insurance provider to understand their policy. If you already have PEX, consider adding a water leak detection system to mitigate risk.
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Also asked as
- What are the downsides of PEX pipe?
- Is PEX pipe a bad choice for my home?
- Why do some plumbers dislike PEX?
Frequently asked questions
Is PEX pipe good to use?
PEX is a good option for many homes due to its flexibility, freeze resistance, and lower cost. However, it has drawbacks like UV sensitivity, rodent vulnerability, and potential for pinhole leaks. Whether it's a good choice depends on your specific situation and local water quality.
What causes pinhole leaks in PEX?
Pinhole leaks are primarily caused by chlorine in treated water reacting with the pipe material over time. This is more common in PEX-b and PEX-c types and can be accelerated by hot water recirculation systems or improper installation.
Can PEX be buried?
Yes, but only if it is rated for direct burial and installed below the frost line. Even then, it is vulnerable to rodent damage and soil contaminants. For buried applications, copper or PVC is often a better choice.
Can a PEX pipe burst?
PEX can burst, though it is more resistant to freezing than copper. Repeated freeze-thaw cycles can weaken the pipe, and bursts are most likely at fittings or if the pipe is not properly supported.
Why don't insurance companies like PEX pipe?
Many insurers consider PEX a higher risk for sudden water damage from pinhole leaks or fitting failures. Some policies exclude PEX-related claims or charge higher premiums. Always verify coverage before installing PEX.