PEX vs. Copper vs. Galvanized Pipe: Comparing Plumbing Materials
Galvanized Steel: The Older Standard
Galvanized steel piping was common in homes built before the 1960s-70s. The zinc coating that once protected the steel degrades over decades, leading to internal corrosion, reduced water pressure, and eventually pinhole leaks.
Most galvanized systems still in service today are well past their practical lifespan, which is why many older homes are strong candidates for a full repipe rather than incremental spot repairs.
Copper: The Long-Standing Reliable Option
Copper piping has been the standard for decades due to its durability, heat tolerance, and resistance to bacterial growth. A properly installed copper system can last 50 years or more.
The tradeoff is material cost and labor time, since copper requires soldered or crimped joints and skilled installation.
PEX: The Modern Standard for Repiping
PEX (cross-linked polyethylene) tubing has become the most common material for residential repiping projects. It is flexible, resistant to freeze-related bursting better than rigid pipe, and generally faster and less expensive to install than copper.
PEX is not typically used for exterior exposed runs where UV exposure is a factor, and some local codes restrict or specify how it can be used — a licensed plumber will know what applies in your area.
Which Material Is Right for a Repipe?
Many modern repipes use a combination: PEX for most interior runs, with copper or brass at fixture stub-outs and connections where added durability matters.
A licensed plumber can review your home’s layout, local code requirements, and budget to recommend the right mix of materials rather than a one-size-fits-all answer.
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Frequently Asked Questions
Is PEX as durable as copper?
PEX has a strong track record and resists freeze-related bursting better than rigid copper, though copper has a longer overall history in the field. Both are considered reliable modern options when installed correctly.
Why is galvanized pipe considered outdated?
The internal zinc coating in galvanized pipe degrades over decades, leading to corrosion, rust-colored water, and reduced pressure. Most galvanized systems still in use are well beyond their practical service life.