Why would you use copper over CPVC or PEX?

Question

Are there any advantages to using copper rather than CPVC or PEX?

Answer 1

• Copper has a well-proven track record
• Copper parts are more readily-available and it's easier to repair (eg, don't need the expensive crimping tool like with PEX)
• Safer during fires since it is much more resistant to heat and giving off fumes

That said, I am a huge fan of PEX. It's been around for quite a few years now (though obviously nowhere near as long as copper), and for the most part is proven.

• Pex is cheaper (in both material and labor costs),
• Pex is easier to install, with many less connections required (eg, try doing a long straight run through a wall or perpendicular through joists - PEX slides right in, copper requires a ton of little segmented pieces and couplers)
• Pex can look better when properly installed (when not properly secured, it sags, and because of the forgiving nature, you can have crooked lines and non-right angles).

Answer 2

PEX can be used for troublesome water supplies that will pinhole copper.