Roof leak: how to find where it's actually coming from

Here's the frustrating part about roof leaks: the wet patch on your ceiling is rarely right under the actual hole. Water lands on the roof, then runs along the sarking or a rafter before it finally drips somewhere lower down. Chasing the stain itself usually points you in the wrong direction.

Safe checks you can do first

• Trace the stain to its highest point: Look at where the discolouration is darkest or wettest — that end is closer to the real source than the drippy edge.
• Check inside during or right after rain: A leak is often only active while it's raining. Look and listen around light fittings, exhaust fans, and any ceiling penetrations.
• Look from the ground, not the roof: After a storm, scan for missing or slipped tiles, lifted flashing, and blocked valleys using binoculars rather than climbing up.
• Check the attic space if you can access it safely: Damp or dark timber, staining on the sarking, or a musty smell can help narrow down the general area.

Why this matters before you call someone

• It saves time on-site: The more you can tell Paul about when and where the leak shows up, the faster he can trace it to the source.
• A guess-and-patch approach rarely works: Sealing the spot where water drips inside, instead of where it actually enters the roof, means the leak just finds a new path.
• Some sources only show up under certain conditions: Wind-driven rain, heavy downpours, or a blocked valley overflowing are all different problems with different fixes.

What not to do

1. Don't climb onto a wet or steep roof: It's one of the most common ways homeowners get hurt trying to find a leak themselves.
2. Don't do a DIY water test with a hose: Without knowing the roof structure, this can push water further into the house rather than reveal anything useful.
3. Don't assume the stain is the leak: Treating the symptom instead of the source is the single biggest reason leaks come back.

What Paul recommends

Take photos, note when the leak appears, and check what you can safely from the ground or inside. Paul takes it from there — a $140 call-out fee gets him tracing the leak to its actual source, not just the ceiling stain, then $120/hour plus materials priced to the job, with a clear price before any work starts.