Structural failures are almost never sudden. The Synagogue collapse, the Lagos high-rise failures of 2021–2024 — every one of those buildings was telling its occupants something for months or years before it came down. Here are the seven warnings we treat as urgent on inspection.
1. Diagonal cracks on shear walls
Diagonal cracks at 45° on a shear wall are a structural distress signal, not a cosmetic crack.
2. Reinforcement exposed on columns
If you can see rebar on a load-bearing column, the column has already lost cover. It is losing capacity now.
3. Spalling on soffits
Slab soffits spall when chlorides reach the rebar. This is corrosion, not bad workmanship.
4. Recurring leaks in the same spot
A leak that recurs after each repair is telling you the structural detail is wrong, not the waterproofing material.
5. Sloping floors
If your floor has visibly sloped since handover, something is settling differentially. It needs a structural engineer, not a tiler.
6. Cracks that change with temperature
Cracks that widen in heat are thermal-movement cracks; cracks that change with rain are moisture-driven. Both matter.
7. Doors and windows jamming
If your doors and windows were fine for years and now jam, the frame has moved. Find out why.
Got a building doing what this article describes?
Send us a WhatsApp message with a few photos. We'll tell you what we think is happening and what it would take to fix.
