Polybutylene Pipes and Home Insurance: What Salem and Keizer Homeowners Should Know
What polybutylene is, why insurers ask about it, and your options
Polybutylene Doesn’t Mean Your Plumbing Will Fail, but It’s Worth Checking
If your home was built in the late 1970s, 1980s or early 1990s, you may have heard of polybutylene pipe, often called “PB” or “poly-b.” Polybutylene is a plastic water supply pipe made from about 1978 to mid-1995, and it went into up to 10 million U.S. homes during that time. Most PB is gray, but it can also be white, silver, black or blue, and it’s usually stamped “PB2110.”
Chlorine and chloramine used to disinfect municipal water can react with polybutylene and make it brittle over time. Small cracks can grow and eventually leak, sometimes without much warning. That’s why PB comes up so often in inspections and insurance reviews, and why it’s worth knowing what you have.
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Where Polybutylene Shows Up
- Near the water heater, where the lines are exposed
- Under sinks and running to toilets
- Along basement ceilings in unfinished areas
- Where the line enters the home near the meter and main shut-off
- At copper stub-outs feeding bathroom fixtures, where PB can connect to copper
Insurance and Resale: What We Can and Can’t Tell You
Some insurers charge higher premiums, require inspections or decline coverage for homes with polybutylene, and policies vary a lot by company. Buyers and lenders may also ask about it, and it often comes up in the inspection report.
We’re plumbers, not insurance agents, so your insurance agent is the right person to tell you how your policy treats polybutylene. What we can do is confirm the material, check its condition and, if you decide to replace it, give you a clear written quote with no surprises once it’s quoted. A plumber’s written assessment can also make a conversation with a buyer, seller or insurer easier.
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Your Options
- Confirm what you have: a plumber can verify the material and check the system
- Keep an eye on it: if it’s in good shape, you may choose to monitor it while you plan
- Replace it: a whole house repipe removes the question for good, and financing can help spread the cost
Common Questions About Polybutylene
How do I know if my home has polybutylene?
Look for gray (or sometimes white, silver, black or blue) flexible plastic pipe, often stamped “PB2110,” near the water heater, under sinks and where the line enters the home. A plumber can confirm.
Will my insurance cancel my policy if I have polybutylene?
It depends on the insurer and the policy. Some charge more, some require an inspection and some may decline coverage. Your insurance agent can tell you how your policy handles it.
Is polybutylene still being installed?
No. Production stopped in the mid-1990s, and new repipes typically use PEX or copper.
Do I have to replace polybutylene right away?
Replacement isn’t required for a home to function, but because leaks can happen without warning, many homeowners choose to replace it on their own timeline. A plumber can help you judge the urgency.
I’m buying a home with polybutylene. What should I do?
Ask your inspector to note the material and its condition, check with your insurance agent early, and consider getting a repipe quote during your inspection period. See our buyer’s checklist for more.
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Whole House Repiping · Whole Home Plumbing Inspection · Request a Quote · All Resources
Related guides: Pipe Identification Guide · Signs Your Home Needs Repiping · What to Expect During a Repipe · Buyer’s Repiping Checklist · For Realtors and Home Inspectors
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