How To Keep Pex Pipes From Freezing. Generally, if the temperature falls below 20 degrees Fahrenheit ice will form in water lines and pipes will freeze.

Will PEX burst if it freezes?

Due to its flexibility, PEX has a small margin of expansion under the damaging pressure caused by ice formation. If the weather gets cold enough, PEX pipes can and will freeze like any plumbing. However, PEX may be less likely to rupture as a result of freezing.

What is the freezing point of PEX pipe?

In fact, PEX tubing remains flexible and can still be bent at temperatures below -40°F (-40°C). Since water expands upon freezing, this elastic property is beneficial during a freeze event, as the pipe can expand with the water.”