Updated 2026-07-20
Here's the thing that catches everyone out: water doesn't fall straight down once it's through the roof. It gets in at a flashing, runs along a batten or a rafter, and drips through the plasterboard somewhere completely different. So the stain on your ceiling tells you almost nothing about where the real problem is.
After thirty years on Sydney roofs, the culprits are boringly predictable. Flashings — the metal that seals where the roof meets a wall, a chimney, a skylight — top the list. Then valleys, where two roof planes meet and funnel a huge volume of water through a narrow channel. Then the penetrations: vent pipes, aerials, anything that punches through the surface. Cracked or slipped tiles come next, and last, capillary action pulling water sideways under tiles that are pitched too low.
What doesn't work is climbing up, finding the nearest crack to the stain, sealing it, and hoping. That's how people end up patching the same ceiling three times. Trace the water back to where it's genuinely getting in, fix that, and it stays fixed.
If your ceiling's staining, don't wait for it to get theatrical. A small leak is cheap. A leak that's been quietly soaking a rafter for a year is not.
Free documented inspection — we'll tell you straight what it needs.