If your home in Victoria BC was built between 1978 and 1995, there is a strong chance it was plumbed with polybutylene — commonly known as Poly B pipe. Tens of thousands of homes across Greater Victoria still have it running behind walls, under floors, and through ceilings. The problem is that most homeowners have no idea it's there until a leak, an insurance notice, or a home inspection brings it to their attention.
Poly B was once considered a modern, cost-effective plumbing material. It was lightweight, easy to install, and widely adopted across Canada during the building boom of the 1980s and early 1990s. But over the decades, chlorine in municipal water — including Victoria's supply — has been slowly degrading the pipe from the inside out. The result is a plumbing system that can look perfectly fine on the surface while quietly deteriorating behind your walls.
The good news is that identifying Poly B is straightforward once you know what to look for. In this guide, we'll walk you through exactly how to check whether your home has Poly B, how to read the markings on the pipe, and what your options are if you find it.
What Does Poly B Pipe Look Like?
Polybutylene pipe has a distinctive appearance that sets it apart from other plumbing materials once you know what you're looking at. Here are the key visual characteristics:
- Colour: Poly B is most commonly grey — a flat, matte grey that is unique among plumbing materials. In some homes it appears as a dull beige or off-white. Occasionally, Poly B used for exterior water service lines is blue or black.
- Texture: The pipe is flexible plastic. If you can touch it, it will feel slightly soft and bendable — unlike rigid copper, ABS, or PVC.
- Size: Most interior Poly B is 1/2-inch or 3/4-inch in diameter, roughly the width of a garden hose or slightly larger.
- Stamped markings: Every piece of Poly B pipe has printed text running along its length. Look for the letters PB followed by a four-digit code — typically PB2110. This is the clearest way to confirm polybutylene.
- Fittings: Poly B connections typically use plastic or copper crimp fittings. The fittings themselves can be a clue — if you see grey flexible pipe connected with metal crimp rings, it is very likely Poly B.
Not all grey pipe is Poly B. CPVC and certain types of PVC can also appear grey, but they are rigid and will not flex when pressed. If the pipe bends easily and carries a PB stamp, it is polybutylene.
Where to Look in Your Home
Poly B runs throughout the entire water supply system of a home, but it is only visible where pipes are exposed. Here are the four best places to check:
Mechanical room / utility room
This is the most reliable place to check. The mechanical room — where your hot water tank and furnace are located — almost always has exposed pipe runs. Look at the pipe coming out of the top of your hot water tank and follow it along the ceiling or wall. If it is grey, flexible, and stamped PB, you have Poly B.
Under sinks
Open the cabinet doors beneath your kitchen and bathroom sinks. Look at the supply lines — the small pipes that come up from the wall or floor and connect to the shut-off valves. If these are grey flexible pipe, that is likely Poly B feeding the fixture. In some homes the Poly B runs right up to the valve; in others it transitions to braided stainless steel connectors near the fixture.
Crawlspace
Many Victoria homes — particularly in older neighbourhoods like Fairfield, Oak Bay, and James Bay — have crawlspaces where plumbing runs are visible. If you can safely access your crawlspace, look along the joists for grey flexible pipe running between rooms. This is one of the best places to see the main trunk lines of the system.
Exposed basement ceiling
If your basement has an unfinished ceiling — exposed joists with no drywall — you will be able to see the water supply pipes running above you. This is common in many 1980s-era Victoria homes. Grey pipe running parallel to drain lines along the joists is almost always Poly B. If your basement ceiling is finished, you will not be able to see the pipes without removing drywall.
How to Read the Stamp on the Pipe
Every section of Poly B pipe has text printed directly on its surface. This stamp contains important information that confirms the pipe material and tells you when it was manufactured. Here is what to look for:
- PB2110: This is the material designation code for polybutylene pipe certified for use in potable (drinking) water systems in Canada. If you see PB2110 printed on the pipe, it is confirmed Poly B. You may also see PB2110 written as CAN/CSA-B137.8 on some pipes — this is the corresponding Canadian standards number.
- Manufacturer name: Common brands include Vanguard, Shell, Qest, and Bow. The manufacturer name is usually printed alongside the PB code.
- Date code: Most Poly B pipe includes a manufacture date somewhere in the stamp — often formatted as a two-digit year and month, or a production code that can be cross-referenced. For example, you might see "8709" indicating September 1987. The date tells you exactly how old the pipe is.
- Pipe size: The stamp also includes the pipe diameter, usually marked as 1/2" or 3/4" (or the metric equivalent).
In many homes the print on the pipe has faded over the decades. If you can see any portion of a PB marking, that is enough to confirm polybutylene. You may need a flashlight and a close look to read the full stamp — the text is small and often covered in dust.
Quick tip: Take a photo of the stamp with your phone's flashlight on. Even if the print is hard to read in person, a close-up photo often picks up enough detail to confirm the material. You can send the photo to us and we'll tell you what you have. Call (778) 265-6446 or contact us online.
What If You Can't Access Your Pipes?
In some homes — particularly those with fully finished basements and no crawlspace — there may be no exposed pipe visible anywhere. In that situation you have a couple of options:
- Check your home inspection report. If you received a home inspection when you purchased the property, the inspector should have noted the type of water supply piping. Look for any mention of polybutylene, Poly B, or the code PB2110.
- Look at the water main entry point. Even in homes with fully finished interiors, the point where the water main enters the home — usually near the water meter or main shut-off valve — often has a short section of exposed pipe. Check there.
- Ask a licensed plumber. A plumber familiar with Victoria-era construction can often identify Poly B quickly based on the age, style, and visible fittings of the home. In many cases the mechanical room or a single access panel provides enough information. A short visit is all it takes.
If your home was built between 1978 and 1995 and you cannot confirm what pipe you have, it is worth having a professional take a look. Many homeowners are surprised to discover Poly B in their home even after living there for years — it is easy to overlook if you don't know what to look for.
I Found Poly B — What Now?
First: don't panic. Finding Poly B in your home does not mean a pipe is about to burst tomorrow. It does, however, mean you are living with a plumbing system that has a well-documented history of failure — and that the clock is ticking.
Here is what we recommend once Poly B has been confirmed in your home:
- Get a professional assessment. A licensed plumber can evaluate the condition of your specific system, identify any areas of concern, and map out the scope of a full replacement. Our team does this at no charge across Greater Victoria.
- Contact your home insurer. Let your insurer know about the Poly B and ask about your current coverage. Many BC insurers are increasing premiums, adding exclusions, or declining to renew policies on homes with Poly B still in place. Knowing where you stand will help you plan.
- Plan for replacement. Full Poly B replacement is the only permanent solution. The pipe cannot be repaired section by section — once it has begun to degrade, the entire system is affected. Replacement involves removing the old Poly B and installing modern PEX-A pipe throughout the home.
- Don't ignore it. Poly B failure often happens without warning. The pipe degrades from the inside, so there is no visible sign of a problem until water is coming through your ceiling or walls. The cost and disruption of a planned replacement is significantly less than dealing with water damage from an unexpected failure.
If you are thinking about selling your home in the coming years, it is worth knowing that Poly B will be flagged during the buyer's home inspection. It is one of the most common negotiating points in Victoria real estate — and addressing it before listing can protect your asking price and simplify the sale.
We also offer 0% financing through Financeit so the work can be completed now with payments spread over time. Apply here.
"In our years working across Greater Victoria — from older Oak Bay character homes to newer builds in Langford — Brook and the Smell Good Plumbers team have dealt with Poly B discovery scenarios more times than we can count. We've seen homeowners who had no idea they had Poly B until a small drip behind a bathroom wall turned into a major insurance claim — and others who caught it early and replaced everything on their own terms, without the stress.
When we come out to your home, we'll always give you a straight answer on what's going on and what your options are — before we do anything. If it turns out you don't have Poly B, we'll tell you that and be on our way. If you do, we'll walk you through exactly what replacement involves, how long it takes, and what it means for your home. No surprises."
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