Six Poly B myths, corrected with the receipts

No such ruling exists. There is no Supreme Court of Canada decision about Poly B and insurance, in 2005 or any other year, and yet this claim is repeated across contractor and realtor websites as if it were settled law.1

The myth appears to fuse two real but unrelated events. In 2002, an Ontario court approved a class action settlement with DuPont that included a standard order barring further indemnity claims against the settling company. In 2005, the National Plumbing Code of Canada removed Poly B from its list of accepted materials, which is a regulatory decision, not a judicial one.1 Neither event forces any insurer to do anything. Coverage trouble with Poly B comes from each insurer's own underwriting choices, which also means a broker can shop for a carrier with a different position.

The famous billion-dollar settlement, Cox v. Shell, covered structures in the United States only. Canadian homes were never eligible, and its claims window closed in 2009 anyway.2

Canada had its own, much smaller class action, resolved in three settlements: DuPont provided $30 million, approved by courts in Ontario and BC in 2002 and Quebec in 2003; Shell settled for $20 million, approved in 2004; and Celanese agreed to pay up to $1 million, approved in 2010. Every Canadian claims window is now closed, the last one on May 11, 2012, and the plaintiffs' law firm confirms all claims have been paid.3 There is no fund left to claim from. Replacement today is the homeowner's cost, which is why insurance pressure, not litigation, drives this issue in Canada.

PEX, the standard modern supply pipe, is also flexible plastic, and some PEX is even grey. What identifies Poly B is the stamp printed along the pipe, usually PB2110, and the era, roughly 1978 to 1998. The identification guide shows the difference with the exact markings.

Every metre of Poly B in a home has been aging on the same timeline in the same water. Fixing the one section that failed leaves the rest exactly where it was the day before the leak, which is why insurers generally will not reinstate or improve coverage based on partial repairs.4 Spot fixes have a place as emergency stopgaps, not as a strategy.

This one is half true, which is what keeps it alive. Alberta installs typically used copper or brass fittings, and Alberta's regulator recorded remarkably few failures over two decades. Quebec's low-chlorine water was also historically gentler on the pipe.5 But the advantage was always about failing slower, not lasting forever. Every Canadian Poly B system is now 28 to 48 years old, at or past its intended service life, and insurers underwrite the pipe's age, not its province.

Home inspectors are not required to identify or test Poly B under standard practice. Many note visible pipe material, but plenty of sales close with the buyer unaware, especially where the plumbing is behind finished walls.6 If you're buying a home built between 1978 and 1998, check yourself or ask the inspector directly, and try the address checker on our home page for the neighbourhood's odds.