The most important thing to understand about roof leaks is that the stain on your ceiling is almost never directly below the defect.
Why water moves before it drops
Water entering a roof runs along the underside of the slab, follows conduits and services, and drops at the first low point or opening it reaches. That can easily be metres from the entry. Patching above the stain is why so many roof repairs fail.
What actually fails
Waterproofing membrane. UV degradation causes cracking and blistering over time.
Drainage. Blocked outlets cause ponding, and standing water finds any weakness.
Parapets and upstands. The junction between roof and parapet is a persistent weak point.
Penetrations. Every pipe, vent and cable through the roof is a potential entry.
Rooftop plant. AC units, water tanks and their pipework produce constant moisture that mimics a rain leak.
The diagnostic question
Does the damage relate to rainfall? If yes, the envelope is the suspect. If damp persists through dry weather, look at rooftop plant, tanks and service lines instead — a distinction that redirects the entire investigation.
Flood testing
Where the entry point is unclear, an isolated roof section is deliberately wetted while the interior is monitored. It conclusively proves where water is entering rather than inferring it.
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