PEX vs Copper Plumbing FAQ
What is the difference between PEX and copper plumbing?
PEX is a flexible plastic water piping material, while copper is a rigid metal pipe. PEX allows longer continuous runs with fewer fittings, whereas copper uses rigid sections joined together with soldered or mechanical fittings.
Is PEX or copper better for repiping a house?
Neither material is automatically better for every home. PEX is often preferred for interior repiping because it resists corrosion and handles expansion well. Copper is commonly used where piping is exposed or where rigid piping is required. Many repiping projects use both materials depending on the application.
Does PEX last as long as copper?
PEX is designed for long term use and resists corrosion and scale buildup. Copper can also last many years, but its lifespan depends on water chemistry, pressure, and installation quality. Proper installation and conditions are critical for both materials.
Is PEX safe for hot and cold water lines?
Yes. PEX is approved for both hot and cold water distribution when installed according to plumbing code requirements. It is commonly used in modern plumbing systems.
When is copper preferred over PEX?
Copper is often preferred for exposed piping, main connections, and areas where rigidity or UV resistance is required. It is also commonly used where local code or design conditions call for metal piping.
Can PEX and copper be used together?
Yes. Many plumbing systems use a combination of PEX and copper. Transitions are made using approved fittings, allowing each material to be used where it performs best.