If you’ve ever pointed at a black drain pipe in your basement and called it PVC, you’re not alone, and you’re also not quite right — this is the ABS vs PVC drainage question we get asked constantly. In Canada, that pipe is almost always ABS, not PVC. Here’s the ABS vs PVC drainage breakdown, and why it matters for your home.

ABS vs PVC Drainage Below Ground: Sewer Pipe

For residential drain lines below ground and larger than 4 inches, we use glued sewer pipe rather than gasketed pipe. Gasketed pipe costs more, and glued sewer pipe is the standard, proven approach across Canada. This part of the ABS vs PVC drainage question rarely comes up, since it’s out of sight, but it’s still worth knowing what’s under your yard.

Above Ground: ABS Is the Canadian Default

Above ground, ABS is what Canadian homes use, either solid wall ABS or a lighter version called Selcor, which has microscopic air bubbles built into the material during manufacturing. That makes Selcor lighter and less costly to produce. The trade off is that Selcor expands more than solid wall ABS when exposed to big temperature swings, so we’ll choose solid wall ABS in any spot where that’s a concern. This is the core of the ABS vs PVC drainage answer for most homes: it was never really a choice between the two materials here.

Why Homeowners Get the ABS vs PVC Drainage Question Wrong

In the United States, PVC is the standard above-ground drain pipe. That’s led a lot of homeowners in London and St. Thomas to call their ABS drain pipe “PVC” simply out of habit. Standard PVC isn’t actually used above ground for residential drainage in Canada. If your plumber installed black pipe in your basement, it’s ABS, not PVC.

Where Fire-Rated PVC Actually Comes In

There is a real place for specialized fire-rated PVC in plumbing, known as System 15 or XFR pipe. This material is engineered to slow the spread of fire and smoke, giving occupants more time to get out of a building safely. You won’t find this in a typical single-family home. It’s reserved for multi-unit residential and commercial buildings, where code requires that extra layer of protection. So even here, the ABS vs PVC drainage question mostly resolves in ABS’s favour for anything residential.

Frequently Asked Questions

Is the black pipe in my basement PVC or ABS?
It’s almost certainly ABS. Canada uses ABS as the residential above-ground standard, not PVC.

What’s the difference between solid wall ABS and Selcor?
Selcor is lighter and uses less material, but expands more with temperature changes. Solid wall ABS is more stable where big swings in temperature are expected.

When is fire-rated PVC used in plumbing?
System 15 and XFR pipe are used in multi-unit and commercial buildings where code requires better fire and smoke performance, not in standard single-family homes.

Why doesn’t Canada use PVC above ground like the US does?
ABS has historically been the Canadian code standard for above-ground residential drainage, which is the main reason the ABS vs PVC drainage confusion exists in the first place.

Does the type of drain pipe affect what a repair costs?
It can. Material availability and access both factor into repair pricing, so it’s best to have a plumber assess the specific situation.

If you’re not sure what’s actually running through your walls, contact Triton Home Service and we’ll take a look before any work starts.

For the full range of drain and plumbing work we handle, see our plumbing services page.