Choosing Your New Pipe
PEX vs Copper: Choosing Your Replacement Material
Once you've decided to replace Poly B, the next real question is PEX or copper. Here's how the two actually compare, head to head.
PEX is the default for most whole-home repipes, but copper can be installed too if that's what you want — no pressure either way.
Get your Poly B repair quote
Either material can be quoted — a referral to a licensed contractor gives you a firm number for both if you're undecided.
We’ll email you to connect you with a licensed plumbing contractor, who confirms your Poly B on site and gives you a firm price — pipe and walls, one number.
Firm, written price before any work begins — no surprise billing, ever.
Both Beat Poly B
Both Are Sound Replacements for Poly B
Whichever you choose, PEX and copper both solve the core Poly B problem — neither shares its documented pattern of internal degradation and unpredictable fitting failure. This comparison isn't about safety; both materials are well-established, reliable choices. It's about cost, installation, and personal preference.
If you haven't yet compared either material specifically against Poly B, see our Poly B vs PEX and Poly B vs copper pages for that angle.
Cost and Installation
Cost and Installation Speed
PEX is flexible and generally requires fewer joints than rigid copper, which needs to be cut to length and soldered piece by piece. That translates into less labour time and a lower overall installed cost for most whole-home repipes.
Copper's installation is more labour-intensive and typically costs more, both in material and in the time it takes a licensed plumber to run and solder each connection properly.
Durability and Track Record
Durability and Real-World Track Record
Copper has a much longer history in North American plumbing than PEX, which gives it a correspondingly longer real-world track record. PEX is newer but has now been the industry standard for whole-home repiping for decades, with an established reliability record of its own.
Neither material shares Poly B's specific failure pattern, so this isn't a safety trade-off — it's a question of which combination of cost, installation approach and personal preference fits you best.
Head to Head
PEX vs Copper, Side by Side
The practical differences that actually matter for a repipe decision.
PEX is generally less expensive, both in material and labour — see our PEX repiping cost page.
PEX's flexibility means fewer joints and faster installation than rigid, soldered copper.
Copper has a longer history; PEX has been the established repipe standard for decades.
Making the Choice
How to Actually Decide
If cost and installation speed matter most, PEX is the practical choice for most homeowners, and it's what installed by default. If you have a specific reason to prefer copper — personal preference, matching an existing system, or a particular application — it remains a sound, durable option. See our best pipe for home repiping page for the broader decision framework across all the material options.
Maintenance Considerations
Ongoing Maintenance Differences
Once installed, both PEX and copper require minimal ongoing maintenance under normal conditions — neither needs the kind of monitoring Poly B does given its degradation pattern. Copper can be more susceptible to corrosion in certain water conditions over very long timeframes, while PEX is generally more resistant to that specific issue.
Neither consideration is likely to be decisive for most homeowners — it's a minor factor compared to the upfront cost and installation differences that usually drive the decision.
Whichever you choose, ask us to confirm what's actually driving the price difference for your specific home during the assessment — sometimes the gap is smaller than expected once your home's particular layout and access are factored in, and sometimes it's larger, depending on how much rigid-pipe routing copper would actually require.
Common Questions
Frequently Asked Questions
Is PEX or copper better for replacing Poly B?
Both are sound replacements that don't share Poly B's failure pattern. PEX generally costs less and installs faster; copper has a longer track record at a higher price. Both remain excellent, well-established choices with strong safety and reliability records — the decision genuinely comes down to your priorities on cost, installation time and personal preference, not concern about either one failing the way Poly B did.
Why is PEX usually cheaper than copper?
PEX is flexible and requires fewer joints than rigid copper, which needs to be cut and soldered piece by piece — less labour time means lower overall cost.
Is copper more durable than PEX?
Copper has a longer real-world history, but PEX has been the established industry standard for decades with its own strong reliability record. We're glad to break out written quotes for both if you want to compare real numbers before deciding.
Can I mix PEX and copper in the same repipe?
Yes, some homeowners do — for example copper on the main line with PEX throughout the rest of the home. We can quote either approach. Ask us for both numbers side by side.
Which one do you recommend?
PEX for most whole-home repipes, based on cost and installation speed — but we'll install copper if that's your preference, and quote both honestly during your assessment. We'll lay out the real trade-offs honestly rather than steering you toward whichever material happens to be more convenient for us that week. We'll answer honestly either way.
What are the copper repipe pros and cons?
Copper repipe pros and cons, briefly: copper is rigid, long-proven, recyclable and tolerant of heat. Against that, it costs more in both material and labour, needs more openings because it will not bend through cavities, and it can develop pinholes in aggressive water.
In Short
PEX vs Copper — The Short Version
PEX vs copper comes down to cost, installation speed and preference, not safety — both are sound replacements for Poly B. PEX is generally less expensive and faster to install, which is why it's our default; copper offers a longer track record at a higher price. The contractors we refer install either, based on what actually fits your home and budget. If price and speed matter most, PEX remains the practical answer for most homeowners; if you have a specific reason to prefer copper, it remains a completely sound choice — either way, the material decision is secondary to making sure the installation itself is done properly by a licensed trade. Either way, you're covered.
Get Started
Compare Both, Priced for Your Home
A referral to a licensed contractor gives you firm numbers for PEX and copper alike.
Get My Poly B Repair Quote