Definition
Polybutylene is plastic piping that looked like a great idea in the 1970s-90s but turned out to be a disaster—it fails prematurely, especially with hot water. If you see it, think "time bomb."
Not sure where this fits?
Answer a few questions and we’ll open the path that fits, at the right step.
Find my pathAbout this term
Polybutylene was used because it was inexpensive and easy to install, but the plastic is susceptible to oxidation and failure, especially in hot water and when exposed to chlorine. Failures increase significantly with age and water chemistry. Many homes with polybutylene experience leaks and water damage. Insurance companies often require replacement or deny coverage. Class action lawsuits resulted in settlement programs offering compensation. Inspectors identify polybutylene pipes (usually gray or white plastic) and recommend replacement.
Pro Tip
If a home has polybutylene pipes, budget for complete replacement. Insurance won't cover it, and the failure risk only increases with age.
Example
A home purchase in Florida was contingent on replacement of polybutylene supply lines. The seller authorized replacement of all polybutylene with PEX tubing ($2,800), addressing insurance company requirements and eliminating future failure risk.