Water was seeping into Roy’s home because the exterior detailing was directing large volumes of rainwater straight down the wall and into the structure.
The flat roof membrane looks poorly installed, and without a downpipe on the upper roof, the lower level was left to cope with far more water than cavity trays and weep vents can handle.
The real problem isn’t the visible damp indoors — it’s uncontrolled water at the top of the building.
A proper downpipe and a professional re-inspection of the flat roof will stop the ingress at its source, rather than just covering up symptoms with paint and treatments.
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Key Takeaways
• Blistered paint and stained ceilings are symptoms, not the cause
• A single-ply membrane must be secure and correctly detailed to stay watertight
• Cavity trays and weep vents can’t manage waterfalls from roof runoff
• Proper drainage design matters more than internal repairs
• Multi-level buildings need tailored water management, not one-size-fits-all fixes
If you’ve got a similar setup with unexplained damp, start by tracing the water back to the top — the roof and drainage usually tell the story.
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