What Is Poly B?

poly-B piping

Polybutylene (often referred to as “Poly B”) pipe is a type of gray or blue plastic water supply piping that was commonly used in residential construction between the late 1970s and the mid-1990s. It was seen as a less expensive and easy-to-install alternative to copper piping.


Over time, several issues with polybutylene piping became apparent:

Degradation from Chlorine:

Polybutylene is believed to degrade when exposed to chlorine, which is commonly used in public water supplies. This degradation can lead to micro-fractures in the pipe.

Joint Failures:

The joints and fittings used with polybutylene pipes were also prone to failure, which can lead to leaks.

Brittleness Over Time:

Over the years, these pipes can become brittle, leading to a higher likelihood of cracking and breaking.

Why Should I Care?

Due to the high rate of failures and the potential for damage to homes, many lawsuits were filed against manufacturers of polybutylene piping. As a result, production was discontinued, and many homeowners have sought to replace their Poly B pipes.

Is there polybutylene piping in your home? It’s often recommended to replace it, even if there haven’t been any issues. The potential risks and costs associated with a burst pipe can be substantial.

What should I do if I have Poly B pipe in my house?

It is important to have this type of piping inspected regularly by a professional plumber to identify any potential issues. If the plumber determines that the pipes are in good condition, they may recommend that you continue to monitor the pipes. You should also have them inspected on a regular basis. If the plumber finds that the pipes are in poor condition or are failing, they may recommend that you have the pipes replaced.

Are you experiencing issues with your Poly-B pipes, such as leaks or bursts? It is important to have them repaired or replaced as soon as possible to prevent further damage to your home. You should also consider replacing your Poly-B pipes if you are planning to sell your home, as many potential buyers may be hesitant to purchase a home with Poly-B pipes due to the potential for future problems.

Generally, it is recommended to replace Poly-B pipes with a more durable and reliable material, such as copper or PEX (cross-linked polyethylene) pipes. A professional plumber can help you determine the best course of action for your specific situation and assist with the replacement process. Contact us for more info!