Polybutylene Pipe in a Colorado Home: How to Identify It and Decide
Polybutylene, or PB, is a flexible plastic supply pipe that went into many homes built from about the late 1970s into the 1990s. If yours was built then, a quick look is worth the time.
Call (720) 794-0054What polybutylene is
Polybutylene is a flexible plastic pipe used for water supply. It was popular for being cheap and easy to install, and it was fitted with plastic or metal crimped connectors. It is a supply pipe, not a drain pipe. It carries water under pressure to faucets, the water heater and fixtures. Drains and vents in the same house are made of other materials.
How to identify it
- Look at pipe near the water heater, the main shutoff and under sinks.
- The pipe is flexible, usually gray, and sometimes blue, black or white.
- Look for the stamp PB2110 on the pipe.
- Look at the fittings. Crimped rings, plastic or metal, are a common sign.
- Photograph any stamp you see and share it with the plumber.
Which homes might have it
Only homes built or repiped in a certain window are likely to have it. Many Adams County and Weld County homes date to the same era, and some may have it. Many do not. You cannot tell from the outside. A house can have PB in the supply and copper elsewhere, because an earlier owner may have replaced a section. Check each visible run.
Found gray plastic pipe?
Call and describe the stamp and where you saw it. The dispatcher will plan an inspection.
Why people replace it
Polybutylene has a reputation for leaking at fittings and for failing without warning. A leak inside a wall can run for some time before it shows. That uncertainty is the reason many owners choose to replace it, even when the pipe has not leaked.
The pipe itself is not always the failure point. Fittings are a common spot. A plumber can inspect and tell you what the pipe looks like where you can reach it.
Replace now, or watch and wait
Two ways to handle polybutylene
| Approach | What it involves | What to weigh |
|---|---|---|
| Whole-house replacement | New supply lines in PEX or copper to every fixture | Higher upfront cost, a long-term fix |
| Partial replacement | Replace the exposed or leaking sections first | Lower upfront cost, PB still in the walls |
| Monitor and inspect | Check fittings and the meter on a schedule | No upfront cost, leak risk remains |
No one option suits every house. See repiping for how replacement works, and ask for options in writing.
What replacement involves
A repipe replaces the supply lines in the house. A plumber plans a route, opens some wall or ceiling access and runs new pipe to each fixture. The old pipe is cut out or abandoned in place. Expect water to be off for part of the day. Wall repair is often a separate trade, so ask what the quote covers before you agree.
Permits and inspections
A repipe is a regulated job. The City of Brighton has adopted the 2021 International Plumbing Code. Ask your plumber who pulls the permit and who schedules the inspection. The city's permit page explains the application. The state plumbing license lookup lets you verify a contractor.
If you see a leak
- Shut the main valve.
- Open a faucet to relieve pressure.
- Photograph the wet area and the pipe.
- Do not cut into a wall to look for the source.
- Phone in and say where the water shows.
A hidden leak in a supply wall can be located with equipment. See leak detection for how the search works before anyone opens a wall.
PEX or copper for the new lines
Most repipes use PEX or copper. PEX is flexible and uses fewer fittings, which makes it easier to run through finished walls. Copper is rigid and has been used for generations. Both are accepted when installed properly. Ask the plumber which one fits your house and why. A good answer refers to access, the existing layout and what the code permits.
Where the walls open
A repipe usually needs some access through ceilings, closets or the attic and crawl space. The goal is to run new lines with the least damage. Ask for a plan that shows where each access hole will be cut. A clear plan reduces surprises, and a plumber who has done many repipes can usually say where openings will land.
Questions for a repipe quote
- Which pipe material will be used?
- Is the quote for the whole house or part of it?
- Who pulls the permit and books the inspection?
- How long will the water be off?
- Does the quote include patching, or only the plumbing?
- Will the water heater connections be replaced too? See water heater replacement.
Timing a repipe
The best time for a repipe is before a leak damages a wall. A planned job lets you pick a date, arrange for water to be off and compare options. A job forced by a leak gives you fewer choices. If you suspect polybutylene, getting an inspection on the calendar is a calm way to learn where you stand.
Living in the house during the work
Most repipes take a few days for an average house. Water is off for part of each day. Plan for dishes, laundry and showers around that schedule. Ask for a daily plan, and ask what condition the house will be in at night. Some owners stay home. Others arrange a short stay elsewhere.
Talk to your insurer
Some insurers ask about the pipe in the house. Ask yours what they need, and keep a record of any inspection and photographs. If a leak has already damaged a wall, plumbing stops the leak and a separate step handles the drying. See water damage restoration.
Sources
Local facts on this page come from public documents.
Quick answers
No. Some runs last for years. The concern is that failure can come without warning, usually at a fitting.
Look for flexible gray pipe stamped PB2110 near the water heater and the main shutoff.
A leak at a fitting can be repaired. A plumber can also tell you whether repair or replacement fits your house.
It can come up in an inspection. Ask your agent and your insurer how it is handled.
It involves some wall access and a day without water. A plumber can describe the plan before work starts.
Want a plumber to look at your supply lines?
Call and say what the pipe looks like and where it runs.