If your Calgary home was built between 1985 and 1998, there is a good chance it still has polybutylene piping running through the walls. And if your insurer has recently sent a non-renewal notice, the pipes are almost certainly why. This is not a paperwork error. It is a deliberate policy shift that has been accelerating across Alberta over the past several years.
Here is what is driving it — and what Calgary homeowners need to understand before their next renewal date.
Poly B was installed in Canadian homes from roughly 1985 to 1998. The material reacts poorly to chlorine in municipal water supplies, causing the pipe walls to become brittle over time. Fittings crack, joints fail, and micro-fractures develop well before any visible sign of damage appears. Insurers do not need a pipe to burst to classify it as a liability. A documented failure pattern is enough.
Calgary treats its municipal water supply with chloramine — a compound that is more persistent than standard chlorine and more chemically aggressive toward Poly B fittings and pipe walls. Homes that may have had a longer window in other regions are often reaching failure faster in Calgary. Insurers underwriting Alberta properties are aware of this and factor it into risk assessments.
Intact, Wawanesa, and Economical are among the carriers that have moved to non-renewal policies on homes with confirmed Poly B systems. The practice is not uniform — some insurers still issue policies with exclusion riders or premium surcharges — but the trend line is clearly toward removal from coverage. Each renewal cycle, the number of carriers willing to insure Poly B homes without condition narrows.
Water damage is already the most common home insurance claim category in Canada. Poly B failures add a specific and predictable risk on top of that baseline. When a fitting fails behind drywall — which is how most Poly B failures happen — the water damage to flooring, insulation, and substructure can run into the tens of thousands of dollars. Insurers price that risk out of their books rather than absorb it.
Some homeowners attempt partial repairs — replacing only the failed section or the accessible fittings. Most insurance underwriters do not accept this as remediation. The issue is systemic, not isolated, because the entire pipe network has aged at the same rate. Partial repair leaves the underlying material risk unchanged. Insurers want full replacement documentation, not spot fixes.
Calgary's real estate market has become increasingly aware of Poly B as a material defect. Home inspectors flag it as a standard finding, which means the presence of Poly B is now documented in inspection reports that insurers can access or request. Buyers seeking insurance on newly purchased homes with Poly B are increasingly running into non-approval at the quote stage — not just at renewal.
As Poly B systems age further past the thirty-year mark, the pool of insurers willing to cover them at any price continues to shrink. Calgary homeowners who received a non-renewal notice with a ninety-day window have less negotiating room than they might expect. Finding a comparable policy with another carrier is possible in some cases — but the window for doing so without a coverage gap or a significant premium increase is narrowing each year.
The only remediation that satisfies insurers across the board is full Poly B removal and replacement with cross-linked polyethylene piping, known as PEX. The Poly B Plumbing Guys works exclusively on polybutylene removal and PEX installation across Calgary and Western Canada. Because the company does nothing else, turnaround times and scoping accuracy are significantly better than a general plumbing contractor taking on the job as a side project.
Calgary homeowners with an active non-renewal notice should get a scope and quote in hand before engaging their insurer for reinstatement. Having replacement documentation to present — including who completed the work and what was installed — is what moves an insurance file from non-renewal to reinstated.