Introduction
PEX piping has become a popular choice for modern plumbing systems due to
its flexibility, cost-effectiveness, and corrosion resistance. But as
temperatures drop, homeowners often ask: Does PEX pipe freeze? While PEX is more
freeze-resistant than copper or PVC, it’s not invincible. In this article, we’ll
explore how PEX performs in freezing conditions, why it’s less prone to
bursting, and actionable steps to protect your plumbing during winter.
How Freezing Affects PEX Pipes
PEX pipes can freeze when exposed to sustained sub-zero temperatures, but
their unique material properties reduce the risk of catastrophic bursting.
Here’s why:
Flexibility: Unlike rigid materials like copper, PEX can expand slightly as
water freezes, absorbing pressure and minimizing cracks.
Memory: PEX can often return to its original shape after thawing, whereas
rigid pipes may sustain permanent damage.
Freeze Threshold: Water inside PEX typically freezes at 20°F (-6°C) or
lower, depending on insulation and exposure time.
5 Ways to Prevent PEX Pipes from Freezing
1）Insulate Exposed Pipes
Use foam sleeves or heat tape on pipes in unheated areas (attics,
basements, crawl spaces).
2）a Steady Indoor Temperature
Keep your thermostat above 55°F (13°C) even when away to protect pipes in
exterior walls.
3)Seal Air Leaks
Caulk gaps around windows, doors, and vents near plumbing to block cold
drafts.
4)Let Faucets Drip
A slow drip relieves pressure buildup if ice forms inside pipes.
5)Install Frost-Free Sillcocks
Upgrade outdoor spigots to models designed to shut off water inside
walls.
What to Do If PEX Pipes Freeze
Locate the Frozen Section: Check for frost or bulging on the pipe.
Thaw Slowly: Use a hairdryer or heating pad—never open flames.
Inspect for Damage: Look for leaks after thawing. Most PEX systems recover
without bursting.
FAQs About PEX and Freezing
Q: Can PEX pipes burst if frozen?
A: While rare, prolonged freezing or rapid temperature swings can cause
splits. Proper insulation reduces this risk.
Q: How long does PEX take to freeze?
A: Depends on temperature and exposure. At 20°F (-6°C), uninsulated PEX may
freeze within 6–8 hours.
Q: Does PEX last longer than copper in cold climates?
A: Yes. PEX resists corrosion and scale buildup, which weaken copper over
time.
Conclusion
While PEX pipes can freeze, their flexibility and durability make them a
top choice for cold-weather plumbing. By combining quality insulation with
proactive maintenance, you can avoid costly winter pipe disasters. For extreme
climates, consult a licensed plumber to ensure your system is winter-ready.
