Water Leak Detection — Finding Concealed Leaks Without Digging

How we actually find it

Three technologies, chosen for the situation rather than used in sequence. Acoustic correlation picks up the sound a pressurised leak makes travelling through pipe and soil, and it’s how most underground supply leaks get pinpointed. Thermal imaging finds hot water leaks under slabs and behind tiles by the temperature difference they create. Tracer gas — a hydrogen-nitrogen mix introduced into an isolated line — finds the leaks the other two can’t, because the gas escapes at the leak point and nowhere else.

Before any of that, we isolate. Shutting off sections of the property one at a time tells us which line is losing water, and sometimes ends the job there — a leaking irrigation solenoid or a running toilet doesn’t need a thermal camera to prove it.

You get the location marked on the surface, with a depth where we can give one, and a written report with images. That report is what your insurer will ask for, so it’s produced as a matter of course rather than on request.

Why non-destructive detection is cheaper than guessing

The alternative to locating a leak is looking for it, and looking for it means opening things up. Four exploratory holes in a ceiling, a section of tiled wall removed, a strip of driveway broken out — and then the repair itself, plus reinstating everything that was opened for nothing.

The cost of proper detection is almost always less than the reinstatement it avoids, and on a tiled bathroom or a stamped concrete driveway it isn’t close. This is the whole reason the equipment exists.

Slab leaks, and what they do if left

A lot of housing across the Hills District and the newer estates is on a concrete slab with supply lines cast into or running beneath it. When one of those fails, the water has nowhere to go but into the ground under your house.

That produces the damage nobody budgets for: saturated fill, movement, cracked tiles and doors that stop closing. A slab leak found early is a repair to a pipe. A slab leak found late is a repair to a pipe plus a conversation about the floor above it.

Repair doesn’t always mean breaking the floor, either. Depending on where the failure is, re-routing the affected line overhead or through a wall is often faster, cheaper and less disruptive than opening the slab — we’ll tell you which applies once we know where it is.

Leaks we’re asked to find most in this area

Underground supply runs on acreage in Dural, Kenthurst, Galston and Annangrove, where a hundred metres of buried line between the meter and the house means a leak can surface a long way from its source — or not surface at all.

Slab leaks in the newer estates from Kellyville through to The Ponds. Wall-cavity leaks in the older Hornsby and Upper North Shore housing, usually at a failed compression joint that has been quietly weeping for years. And irrigation and pool lines everywhere, which are the single most commonly forgotten source of a big water bill.