What leak detection involves
We work from the cheapest test to the most invasive. First the water meter: with every fixture off, a spinning low-flow dial means water is leaving the system somewhere. Then isolation: closing valves one branch at a time to narrow the search. Then tools such as a moisture meter, a thermal camera and an acoustic listening device to find the spot inside a wall or slab.
- Read the meter, wait, read again.
- Check the obvious suspects: toilets, the heater relief valve, hose bibs, the softener.
- Isolate supply branches and pressure-test if needed.
- Scan suspect walls and ceilings and mark the wettest point.
- Open the smallest possible hole to confirm.
Why North York houses need it
Older copper in North York homes, especially thin type M pipe used in some 1960s and 1970s builds, can develop pinhole leaks. Galvanized lines rust from the inside and weep at threaded joints. Townhouse complexes near York University and in Flemingdon Park share walls, so water from one unit can show up in the next. Finding the source before cutting saves drywall and arguments with neighbours.
Plumber's tip: Find your main shut-off now and test that it turns. If a leak becomes a flood, closing that valve is the most important thing you can do while you wait.
How we write up the job
We record each test, the meter readings with times, which branches we isolated, the instrument readings, and where we cut. If the leak is in the building's common plumbing rather than your unit, we write that down for your property manager. The sheet ends with a clear statement: source found, or narrowed to a specific area with the next step named.
Signs you should call
- Your water bill jumped with no change in use.
- A brown ring on the ceiling below a bathroom.
- Floor spots over a slab that feel warm.
- Running water you can hear with every tap off.
- Paint bubbling or baseboards swelling.
Once the source is found, the fix may be a pipe repair or a new main shut-off if that is what failed.
Costs and what affects them
Most of the price is time. A leak that shows on the first meter test is quick. A slow drip inside a slab or a ceiling between units takes longer. Repairs are quoted after the source is confirmed.
Job at a glance
| Category | Pipes |
|---|---|
| Tools | Moisture meter, thermal camera, acoustic listener |
| Final test | Meter standing still after the repair |
Tell-tale signs
- Meter needle creeps with every fixture shut
- Ceiling stain spreading below a bathroom
- Warm spot on a slab floor
Steps on the job
- Read the meter with everything off to confirm a leak
- Isolate zones by closing fixture stops
- Use moisture meter and thermal camera to narrow it
- Open the smallest possible access to confirm
Your questions on this one
Do you repair the drywall too?
We open the smallest hole we can. Patching and painting is usually best done by a finisher.
Could the leak be hiding beneath the basement floor slab?
Yes, especially in slab-on-grade homes. Acoustic tools help locate it before breaking concrete.