As a plumbing expert with years of experience in the industry, I've had the opportunity to work with a variety of materials, including PEX, or cross-linked polyethylene pipes. PEX pipes have become increasingly popular due to their flexibility, durability, and resistance to corrosion. However, the question of whether PEX pipes can burst is a common concern among homeowners and professionals alike.

Burst Resistance of PEX Pipes:
The flexibility of PEX pipes is one of their key advantages. This flexibility allows the pipes to absorb movement and vibrations that might otherwise cause stress fractures in less flexible materials like copper or PVC. PEX pipes are made from a material that is cross-linked at the molecular level, which enhances their strength and resistance to both pressure and temperature changes.

Comparison with Copper Pipes:
Copper pipes, while known for their longevity and corrosion resistance, are not as flexible as PEX. They are more susceptible to bursting due to the stress caused by freezing water. When water freezes, it expands, and in a rigid pipe, this expansion can lead to cracks and ultimately, bursting. PEX, on the other hand, can expand slightly with the ice, reducing the risk of burst.

Risk of Bursting in Freezing Conditions:
Despite PEX's enhanced burst resistance, it is not immune to the effects of freezing temperatures. If the temperature drops low enough for the water inside the pipes to freeze completely, any type of PEX pipe can potentially burst. The risk is particularly high if the pipes are not insulated or are exposed to extreme cold for extended periods.

Preventive Measures:
To mitigate the risk of PEX pipes bursting due to freezing, several preventive measures can be taken:

1. Insulation: Proper insulation of the pipes can help maintain the temperature above freezing.

2. Drainage: Draining the pipes when freezing temperatures are expected can prevent water from freezing inside the pipes.

3. Circulation Systems: Installing a system that circulates water through the pipes can help prevent freezing.

4. Heat Tapes: Applying heat tapes to the pipes can provide additional warmth to prevent freezing.

Maintenance and Inspection:
Regular maintenance and inspection of PEX pipes are essential to ensure their longevity and to identify any potential issues before they become critical. This includes checking for signs of wear, damage, or leaks, and ensuring that the system is functioning as intended.

Conclusion:
While PEX pipes are more burst-resistant than copper due to their flexible nature, they are not completely immune to bursting in the event of complete freezing of the water within them. Taking the appropriate preventive measures and conducting regular maintenance can significantly reduce the risk of burst pipes.

read more >>

Burst/frozen pipes. It is true that due to the flexible nature of PEX, it is more burst-resistant than copper. Yet in low temperatures, if water completely freezes in the pipes, all types of PEX may burst.read more >>