Question 1

What is poly B (polybutylene) pipe and why does it need replacing?

Accepted Answer

Poly B is a grey flexible plastic pipe installed in most Metro Vancouver homes built between 1978 and 1995. The core problem is chemical degradation: chlorine and oxidants in the municipal water supply attack the pipe from the inside, making the material brittle over time. Failures happen at the fittings first — often suddenly and without any advance warning. A burst poly B fitting can discharge a large volume of water before anyone notices. The defect was serious enough to trigger a $950 million class action settlement in the US (Cox v. Shell Oil Co., 1995). BC insurers responded by tightening coverage requirements, and most now require poly B removal before they'll underwrite water damage.

Question 2

What is the life expectancy of poly B pipe?

Accepted Answer

Poly B was originally rated for 50+ years, but real-world performance in Metro Vancouver is far shorter — most poly B piping has a practical safe service life of 10 to 25 years. Homes with original poly B from the 1978–1995 installation window are now 30 to 50 years old, meaning most of that pipe is well past any reasonable service life. The risk is highest at the fittings — especially the original grey plastic acetal fittings — which tend to crack before the pipe body itself. There's no reliable way to extend poly B's lifespan; replacement is the only permanent solution.

Question 3

What is the poly B failure rate?

Accepted Answer

Failure rates are high enough that courts, building codes, and insurers all treat poly B as a known defective product. Research tied to the 1995 Cox v. Shell class action estimated that 85 to 90 percent of poly B installations would eventually fail. In Metro Vancouver specifically, elevated chlorine levels in the municipal water supply accelerate degradation faster than in many other regions. The highest-risk points are the acetal plastic fittings, which can crack even when the visible pipe body looks intact — meaning a visual inspection alone won't catch every failure point.

Question 4

Why is poly B plumbing bad?

Accepted Answer

Three core reasons. First, chemical degradation: chlorine in the water supply oxidizes the pipe material and fittings from the inside out, causing brittleness that worsens every year. Second, failure without warning: unlike a corroding copper pipe that tends to show slow pinhole leaks, poly B typically cracks suddenly at a fitting and releases water rapidly before anyone notices. Third, it's a documented defective product: poly B was removed from the National Plumbing Code of Canada in 1995 after widespread failures, and the $950 million US class action settlement confirmed the manufacturer was aware of the defect. BC's chlorinated water supply makes it particularly aggressive on poly B compared to other parts of Canada.

Question 5

When was poly B banned in Canada and BC?

Accepted Answer

Poly B was never banned outright by legislation — it was removed from the approved materials list in the National Plumbing Code of Canada (NPC) in 1995. Once removed from the NPC, poly B could no longer be installed in new construction anywhere in Canada, including BC. Production of poly B pipe in North America stopped the same year. The phase-out followed years of reported failures and the $950 million Cox v. Shell Oil class action settlement in the US. Any home built after 1995 should not have poly B — if it does, the pipe was either installed without a permit or there's a misidentification.

Question 6

Can you insure a house with poly B in BC?

Accepted Answer

Yes, but it's getting harder and more expensive every year. The most common scenarios in BC right now: many insurers will renew or issue a policy but add a poly B surcharge, typically ranging from $500 to $2,000 or more per year; some require a written plumbing inspection report confirming the condition of the pipe; and a growing number of BC insurers will no longer offer coverage at all to homes with poly B, or will exclude any water damage claim where a poly B pipe was the source. The issue also comes up in home sales — a buyer's new insurer frequently refuses to underwrite a home with poly B, which can kill a deal. Replacing poly B removes the risk entirely and in most cases eliminates the surcharge immediately.

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