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Department: Pipes

Poly-B Pipe Replacement in Oakville

Grey plastic pipe was the modern choice once. Today it is the reason many insurers ask questions. Here is the plain story on poly-B.

  • Clear diagnosis before any cutting or replacing
  • Price explained before the work starts
  • Tested with water running before we leave
  • Booked by phone, no forms
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or ring (365) 399-5986Real people answer. Bookings by phone only.

  • Licensed & insured (details on request)
  • Oakville & Halton
  • Phone bookings only
A workshop table with a metal clamp
A workshop table with a metal clamp.

What poly-B pipe replacement involves

Polybutylene, known as poly-B, is a grey flexible plastic supply pipe that was installed in many Canadian houses from the late 1970s into the 1990s. Replacing it means running new supply lines, typically PEX or copper, from the primary shut-off to every fixture, and then disconnecting the old system.

A good replacement plan follows the routes the old pipe took where possible and finds smarter paths where it does not. Access holes are kept small and placed where patching is easiest, such as closet walls and the basement ceiling. New shut-off valves go in at each fixture.

Job sheet: Poly-B Pipe Replacement in Oakville

Where we get in
Grey Poly-B runs in the basement ceiling and up through walls
On the van
PEX, crimp or expansion fittings, new stops, hangers, cutters
Before we pack up
Pressure held and every fixture checked hot and cold
How to book
Phone only: (365) 399-5986

Why it happens in Oakville homes

Many Oakville neighbourhoods filled in during exactly the years poly-B was popular. Glen Abbey, River Oaks, parts of Iroquois Ridge and other areas built through the 1980s and early 1990s are places where it can still turn up. The pipe itself degrades with age, and some fittings are known weak points. Failures tend to come without warning, often at a joint behind a wall.

Insurance is the other driver. Some insurers ask about poly-B when a policy is written or renewed, and the answer can affect coverage. That is a question for your insurer, not a plumber, but it is often what starts the conversation.

Signs you need this now

  • Grey plastic pipe at the water heater
  • Leaks at plastic or metal crimp fittings
  • Home built roughly 1978 to 1997
  • Insurer asking about Poly-B
  • Selling or buying a home with it

What to check before you call

  • Look where pipes enter the water heater and around the primary shut-off in the basement. Grey plastic marked PB2110 is a strong clue.
  • Check under sinks. Poly-B often appears at the shut-off valves even when walls hide the rest.
  • Note any past repairs. A home may have had some poly-B replaced already.

Our guide on identifying poly-B pipes has more detail, including how it differs from grey PEX.

Not every grey pipe is poly-B. Some modern PEX comes in grey too. Look for the printed marking along the pipe before drawing any conclusion.

The visit in five steps

  1. 1Confirm Poly-B and trace the runs
  2. 2Plan replacement routes
  3. 3Install new PEX trunk and branches
  4. 4Swap each fixture to new supply
  5. 5Remove old pipe where reachable and test

How the visit runs

Replacement starts with a walkthrough. The plumber traces where the supply lines run, counts fixtures and looks at access from the basement. You get a written scope describing what will be replaced and what openings are expected. On work days, water is shut off for stretches, and the crew restores it at the end of each day wherever possible. When the new system is connected, it is pressure tested before walls are closed. Patching and painting the access openings is a separate trade, and the plumber tells you up front how many to expect and where they will be, so nothing comes as a surprise at the end.

Related problems

A full house of old pipe is covered in our repiping department. If the pipe from the street is also old, see water service line replacement. An active leak calls for leak detection or burst pipe repair first.

Straight answers to common calls

Can I replace only the poly-B I can see?

Partial replacement is possible, but the hidden pipe is still the same age. Many homeowners plan a full replacement for peace of mind and for insurance questions.

How long is the house without water during a repipe?

Usually not continuously. Crews typically work in sections and bring back water at the end of the day where the layout allows.

What replaces poly-B?

PEX is common because it is flexible and fits through existing routes; copper is another choice. The plumber explains the trade-offs for your home.

Keep reading

Ready when you are

One call books the visit. Tell us what you are seeing and we will tell you straight what it likely is.

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