PEX vs Copper

During the Midwest February I usually inspect at least one property where the utilities are off and the copper pipes have ruptured due to freezing. I am forced to consider, PEX vs copper ?

Copper Pipe

Copper Tubing
Copper tubing has been the standard for plumbing requiring a certain skill-set for installation. This is a job you can do yourself, but it does require training, practice and specialized tools.

Copper has natural attributes that make it ideal for plumbing. It creates a biostatic atmosphere which prohibits bacteria growth. It also resists corrosion and is unaffected by ultraviolet rays, which allows you to use it outdoors.

Copper does have a few disadvantages. Copper has become expensive, whereas PEX is typically about one third of the cost. It can still corrode based on the pH levels of water, and if you live in a cold climate, frozen water can cause copper pipes to burst. Because of it’s value, copper often gets stolen from empty or abandon properties creating a great expense for the next owner.


PEX or Cross-linked polyethylenePEX (Cross-linked polyethylene) was introduced in the US around 1980 and has become commonplace for re-piping and plumbing repairs.

PEX popularity can be attributed to many factors:

  • one third the cost of copper
  • flexibility
  • resistance to scale and chlorine
  • fast installation
  • fewer connections and fittings
  • PEX is also more efficient as it doesn’t lose heat as rapidly as copper
  • resistant to freezing temperatures and bursting
  • PEX is color coded based on water temperature

Installing PEX tubing can be done with cinch or crimp rings and a cinch clamp tool or compression or stab-in fittings, either technique is easier and less toxic than sweating copper.

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