Utilizing PEX Pipe From Street to Fixture | Plumber Magazine (2024)

FAQs

Where should you not use PEX pipe? ›

PEX pipe is not approved for outdoor applications and is not approved for continuous UV exposure. PEX pipe should not be stored in direct sunlight.

It's a good idea to install 1/2-inch or 3/4-inch PEX for your main lines for adequate water flow. When replacing old water supply lines with PEX the standard is to use the same size plumbing, although you can transition from 3/4-inch to 1/2-inch plumbing with an adapter.

Of course, PEX piping does carry some disadvantages. It will crack and break apart under the influence of strong UV rays (making it unsuitable for most outdoor use). Plumbers require specialized tools to cut and join this type of modern pipe. Additionally, disposing of used PEX pipe sometimes proves problematic.

In most cases, PEX is extremely durable and lasts up to 50 years or more. PEX piping is also less likely to crack or break than metal pipe because it does not expand and contract as much when heated and cooled.

Pex pipes are more susceptible to damage from exposure to UV rays, which can cause them to deteriorate over time if they're used for outdoor applications. Moreover, Pex pipes can react with certain chemicals in the water, potentially leading to leaching of harmful substances into the water supply.

The owner of a building should specify low-zinc brass fittings or use "engineered plastic" fitting components. -- PEX was also suspected of leaching controversial chemicals such as MBTA, TBA and BPA that are considered toxic.

PEX plumbing pipes are usually a good performing system, but they may not last as long when used outdoors due to the harsher conditions. For that reason, they are not recommended for outdoor use.

For all PEX pipe and tubing, the maximum operating temperature is 200°F. No PEX should be operated at temperatures above 200°F for any length of time. The use of crosslinked polyethylene (PEX) pipe and tubing in high- temperature applications with operating temperatures above 180°F may affect the tubing's design life.

PEX pipes are extremely burst- and freeze-resistant because of their insulation properties and natural flexibility. However, at certain temperatures, even PEX can no longer stand up to the elements.

As with any other pipes, PEX is not prone to leaking. Nearly all of the plumbing leaks occur at joints (connection spots) and most of them are due to incorrect installation. Much like installing PEX tubing, repairing it is also an easy process.

Should I replace old plumbing with PEX? ›

PEX lasts longer

It has been used for decades in thousands of homes with 30-year-old leak-free piping. Long-term testing programs show it has a potential lifespan of more than 100 years. Unlike copper systems which may have to be re-piped every few years due to corrosion and pinhole leaks.

While it is more expensive than pex, your plumbing isn't something you should scrimp on for new construction. Copper is usually preferred for water supply lines and heating systems but plex is most often used for drain or waste lines because copper corrodes over time.

It is usually worth it to replace older copper pipes with PEX. PEX is more reliable and durable in the long term.

PEX pipe leaches chemicals and it varies considerably between the type, brand, and sometimes even between the same brands—so it is difficult for consumers to weigh the risks.”

PEX pipes can last almost as long as copper, with its shell life running anywhere from 40 to 50 years. PVCs meanwhile, have a longer life expectancy at about 70 years for as long as they are maintained well.