Poly-B replacement
Poly-B Pipe Replacement
Grey polybutylene supply pipe went into Canadian houses from the late 1970s to the late 1990s. Some insurers now ask about it by name.
Polybutylene, sold as Poly-B, was a flexible plastic supply pipe used in Canadian houses from about 1978 to the late 1990s, with sources putting the end between 1995 and 1997. It was removed from the national plumbing code in 2005. Plenty of houses still carry it.
How to spot Poly-B
Look where the supply pipe is exposed: at the water heater, under sinks, at the main shut-off. Poly-B is usually grey, sometimes blue or black, and often stamped PB2110. It connects with crimp rings or plastic fittings. The Poly-B identification note has photographs of what to look for.
Why insurers ask
Poly-B fails most often at its fittings, and chlorinated water and heat speed up its ageing. Some insurers decline houses with it, some raise the water-damage deductible, and some only ask for a replacement plan. Ask your own insurer what it requires before deciding.
What a repipe involves
- Map every Poly-B run from the main shut-off to each fixture.
- Run new PEX or copper, using existing routes where possible.
- Open walls and ceilings only where the new line cannot be fished.
- Pressure-test before closing anything.
Poly-B in a seasonal cottage
A cottage that freezes and thaws every winter stresses its fittings harder than a heated house. If the supply is Poly-B and the cottage is drained each fall, replace it before a fitting gives way during the spring refill. The frozen pipe repair page explains how plastic and copper behave in a freeze.
FAQ
Poly-B replacement — common questions
Is Poly-B dangerous?
It is not a health hazard. The concern is leaks: Poly-B fails more often than copper or PEX, mostly at fittings, and insurers price that risk.
Do I have to replace all of it at once?
No. Replacing the exposed runs and fittings first, then the rest during a renovation, is a common plan. Ask your insurer whether a partial replacement satisfies it.
What replaces Poly-B?
PEX in most houses, because it fishes through walls with less opening. Copper where it suits the house or the existing runs.
Talk to a Collingwood plumber
Collingwood Plumbers needs three things: the town, whether the house is on town water or a private well, and what the water is doing. Those three decide most of the job, from who you should actually call, to whether the fix is a valve, a pump or a pipe.