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Roof leak detection

Roof Leak Detection in Sydney

Flat roofs, terraces and box gutters are where water gets in from outside. We trace roof leaks back to the failed membrane, flashing or seal — not just the spot it drips.

Roof leak detection

Where it drips isn’t where it leaks

Water almost never enters a roof directly above where it drips inside — it runs along the structure first. That’s why chasing the stain rarely works.

We focus on the waterproofed flat roofs, terraces, parapets and box gutters we specialise in, and trace the water back to the actual entry point.

Inspecting a Sydney flat roof membrane for a leak
The problem

Signs of a roof leak

These usually get worse with heavy or driving rain.

Stains after rain

Ceiling marks that appear or spread after heavy rain.

Active drips

Water dripping from the ceiling or down a wall during a downpour.

Sagging plaster

Plaster bulging or sagging where water has pooled above.

Mould in top corners

Mould forming in upper corners of top-floor rooms.

Damp top-floor rooms

A musty smell or damp in the rooms directly under the roof.

Ponding on the roof

Water sitting on a flat roof or terrace instead of draining.

Checking roof flashing and membrane for failure
What’s behind it

What lets water in

On the flat roofs and terraces we cover, these are the usual failures.

  • A failed or aged flat-roof or terrace membrane.
  • Flashing failures at walls, parapets and penetrations.
  • Cracked parapets or a failing box gutter.
  • Perished seals around vents, pipes and fixings.
  • Ponding from poor fall or blocked drainage.
How we find it

We trace it to the entry point

We follow the water back from the internal stain to where it actually gets in.

  • Map the internal damage — moisture readings show the path the water has taken inside.
  • Inspect the roof — we check the membrane, flashings, parapets and drainage above.
  • Image and test — thermal imaging and testing confirm the entry point.
  • Report the findings — a clear result for your roofer, strata or insurer.
Non-invasive, no demolitionMoisture mappingThermal imagingTargeted testingWritten report
Upfront pricing

A clear price before we start.

Every inspection starts at a fixed first-hour rate, confirmed with you before any work. No call-out surprises, and no obligation to proceed with a repair.

  • $299 inc GST for the first hour on site.
  • A fixed price agreed before we start.
  • A written findings report for strata or insurance.
Typical inspectionIncluding the first hour on site
$299 inc GST

Fixed first hour on site · confirmed before we start

  • No-dig, non-invasive detection
  • Thermal imaging & moisture mapping
  • The leak located and explained
  • A clear written findings report

Guide pricing only. We confirm a fixed price before any work starts — no surprises.

Questions, answered

Roof leak detection — FAQs

Do you do tiled/metal roof plumbing repairs?
We specialise in detection on waterproofed flat roofs, terraces and the wet-area side of roofing. We locate and prove the source; the repair is then done by the right trade.
Why can’t you just look where it drips?
Water runs along the structure before it drips, so the entry point is usually well away from the stain. We trace it properly rather than guess.
Can you inspect in the rain?
An active leak during rain can actually help us trace it. We’ll advise the best conditions when you book.
What does it cost?
Our first hour on site is $299 inc GST, confirmed before we start.

Ceiling leaking when it rains?

Book a roof leak inspection and we’ll trace it back to where water is really getting in.