Residential · Sewer & main drain
Backwater Valve Installation in Markham
We fit backwater valves on the building drain below the slab: saw-cut the concrete, dig down to the drain, install the valve body with a cleanout lid flush to the floor, then re-pour the patch.
- Floor drain hosed and disinfected after a backup
- Distance to the fault measured on the cable
- Camera footage of the lateral reviewed with you
- Dig or line? Both options laid out before a shovel moves
- Licensed plumbers (details on request)
- Price agreed before work
- Call-only, no forms
- Tested before we leave
Signs you need backwater valve installation
You have had a sewer backup before, or a neighbour on your street has. The basement is finished, or you plan to finish it. Your home sits in a lower part of the street, or you have a basement bathroom, laundry or kitchenette below grade. An insurer has asked about backup protection. Any one of these makes a valve worth a serious look.
Our routine on the day
We begin with a camera inspection of the main line, so the valve goes into healthy pipe and we know exactly where the line runs under the slab. Then we confirm a suitable location: downstream of all basement fixtures, accessible for maintenance, and away from load-bearing posts. A section of floor is cut, the old pipe is removed, and a normally open backwater valve is installed with a cleanout access box giving you a way to reach the flap for checks and cleaning.
The work is permitted and inspected where required, and we arrange that process. After the inspection, fresh concrete closes the trench and the lid finishes level with the floor. We show you how to open it, check the flap and keep it clear.
Markham houses and what shapes this job
Layout is the main variable. In an unfinished basement, the job is mostly concrete work. Where the basement is finished, some flooring and occasionally a strip of wall must come up near the main line, which adds time and restoration. Homes in Cornell, Box Grove and Greensborough generally have newer PVC lines and predictable layouts, while older houses near Markham Village can hold surprises like cast iron or clay under the floor.
Fixtures upstream of the valve matter too. Once the valve closes during a surcharge, basement fixtures that drain through it cannot empty. We talk about that honestly, so nobody runs a load of laundry at the wrong moment.
Foundation drains are another consideration. If weeping tiles are tied into the sanitary line, a valve can trap that water during storms. In such cases, disconnecting them and adding a sump pump may be part of a sound plan.
Looking after it
Open the access lid twice a year and make sure the flap swings easily with no debris caught inside. It takes a few minutes, and our team can show you how on the day of installation.
Ring us without delay if
If a backup has just happened, call for cleanup and clearing first. Book the valve once the basement is dry and you have read our backwater valve basics.
Once the valve closes during a surcharge, basement fixtures that drain through it cannot empty.
From the job notes of Plumbers in Markham
Job card · Sewer & main drain
On the van for this job
- Sectional machine with root-cutting blades for 3-inch and 4-inch lines
- Floor drain plugs and wet-vac for backed-up basements
Signs you need this
- The basement floor drain fills when the washer empties
- A sewer odour rising around the basement floor drain
What we check before we pack up
- Open the main cleanout and see which side holds water
- Camera the lateral to the property line
| Pipe | Where we find it | Typical fault |
|---|---|---|
| Clay tile lateral | Older villages, pre-1960s | Root entry at joints, cracked bells |
| PVC lateral | 1980s onward | Bellies, offset joints after settling |
How the job runs, start to finish
- 1
On the phone
Explain what the water is doing and where. We ask the age of the house and which valve or breaker to shut while we drive over.
- 2
Drop cloths down
Floors and cabinets get covered, the water or gas is isolated and the work area is lit.
- 3
Find the failed part
We open the trap, cleanout, access panel or wall where the fault is, and show you what we found.
- 4
Quote, then work
We explain what failed and what the fix costs; no cutting starts until you say yes.
- 5
Cut, fit, seal
Old parts come out, new pipe, valves or fixtures go in, and joints are soldered, pressed, crimped or glued.
- 6
Test and ticket
We run water, pressure-test or fire the heater, check for drips, clean up and leave a written ticket of what was done.