If you own one of Montréal-Ouest’s charming circa-1900 Victorian or Edwardian homes on those mature, maple-shaded avenues, your house has beautiful bones — but it may also have a sewer lateral that’s over a century old. Those old clay or aging cast-iron pipes are exactly what tree roots love to invade, and with so many mature maples lining the streets since the town’s 1897 incorporation, root intrusion is one of the most common drain problems we see when we’re called out as a plumber in Montréal-Ouest. The good news: a camera inspection can tell you exactly what’s happening underground before you spend a dollar on repairs.

Why Montréal-Ouest’s Older Homes Are Especially Prone to Root Intrusion

Montréal-Ouest was built out as a compact, roughly 400-acre town starting in 1897, shaped by the Grand Trunk Railway line laid in 1855 and the Canadian Pacific tracks that followed in 1886. Many of the original single-family homes from that era are still standing today, and their original sewer laterals often are too. Clay pipe was the standard material for decades, and its jointed sections are notorious for letting tree roots creep in through tiny gaps or cracks. Cast iron laterals, common in slightly newer builds, corrode over time and develop the same vulnerability.

Add to that the maple canopy that gives the town’s avenues their character — mature trees have equally mature root systems, and they’ll travel surprising distances underground in search of the moisture and nutrients found inside a leaking or slightly cracked sewer line. Once roots find a way in, they grow into thick mats that trap toilet paper, grease, and debris, and the blockage gets worse every year until you’re dealing with a backup.

Signs Roots May Already Be in Your Line

• Gurgling sounds from drains or toilets, especially after heavy rain
• Slow drainage in multiple fixtures at once (not just one sink)
• Recurring backups in a basement floor drain or laundry tub
• Sewage odours in the basement
• Unusually lush, green patches of lawn over the lateral’s path

Camera Diagnosis: Seeing the Problem Before You Dig

Rather than guessing — or worse, excavating a heritage property’s front yard on a hunch — we start with a camera inspection. A waterproof, self-leveling camera head is fed directly into the sewer lateral, giving us a live video feed of the pipe’s interior condition from the house all the way to the municipal connection.

This tells us precisely:

• Where the roots have entered and how extensive the mat is
• Whether the pipe itself is cracked, offset, or collapsing versus just root-clogged
• The pipe material and approximate age, which helps predict future problems
• The exact distance from the cleanout or foundation, so any digging is targeted and minimal

For a home with the kind of century-old plumbing common in Montréal-Ouest, this step is what separates a $300 clean-out from an unnecessary $10,000 excavation. You can read more about how the process works on our plumbing services page.

Solutions: From Cleaning to Trenchless Repair

Mechanical or Hydro Jetting

If the camera shows roots but the pipe walls are otherwise intact, a mechanical auger or hydro jetting can clear the mat and restore flow. Hydro jetting is particularly effective because the high-pressure water scours the full diameter of the pipe, not just a channel through the roots, which slows regrowth compared to a simple snaking.

Trenchless Pipe Lining

When the camera reveals that the pipe itself is cracked, offset at joints, or structurally compromised — common in original clay laterals from the town’s early decades — cleaning alone won’t hold. Trenchless pipe lining inserts a new resin-saturated liner inside the old pipe, creating a jointless, root-resistant interior without digging up your lawn, driveway, or the mature trees you’d rather keep.

Full Replacement

In cases of severe collapse or bellied pipe sections, traditional excavation and replacement is sometimes the only durable option. The camera footage lets us show you exactly why, rather than asking you to take our word for it.

A Note on Backwater Valves

If your basement has fixtures below street level — a common layout in these older homes — the Quebec Plumbing Code requires a backwater valve to protect against sewer backups, a requirement that’s been mandatory for new installations in Montreal since 2011. If root intrusion has already caused backups in your home, installing or servicing a backwater valve alongside your drain repair is worth discussing.

If you’re hearing gurgling drains, noticing slow-draining fixtures, or you’ve already had a backup, don’t wait for it to get worse. Call Plomberie A+ for a camera inspection and a clear, honest plan to fix it right the first time: (514) 242-9691.