Pipes & leaks
Galvanized and Polybutylene Pipes: Should You Replace Them?
Updated · Kestrel editorial
Short answerGalvanized steel rusts from inside, reducing pressure and discoloring water; polybutylene can fail suddenly at fittings. If your home has either and you're seeing leaks, low pressure or rusty water, repiping with PEX or copper is usually worth it.
Identify
- Galvanized: gray threaded steel pipe; a magnet sticks
- Polybutylene: gray plastic stamped PB2110, common late 1970s–mid 1990s
Signs of trouble
- Low pressure
- Rusty water
- Repeated leaks
Repiping
See whole-house repiping.
Planning a repipe
Most repipes use PEX, run through walls with small access openings. A plumber maps the fixtures, plans the routes, and patches openings; the house can often stay occupied during the work.
Galvanized and Polybutylene Pipes: Should You Replace Them?: follow-up questions
How do I know if I have polybutylene pipe?
Gray plastic supply lines, often stamped PB2110, were common in homes built from the late 1970s to mid-1990s.
Does galvanized pipe affect water pressure?
Yes. Rust builds up inside galvanized pipe and narrows it, reducing pressure over time.
Every home differs; editorial standards.