Almost every concrete building cracks. The useful question is not whether a crack exists, but what it is telling you about the structure behind it.
Why concrete cracks at all
Concrete shrinks as it dries and moves with temperature. In Dubai, where surfaces can swing by more than 30°C between night and midday, that movement is constant. Fine, shallow cracks are often the material relieving stress, and many never grow.
Problems start when cracks are caused by load, settlement or corroding reinforcement. Those cracks keep moving, and they usually get worse.
Signs it is usually cosmetic
These are worth recording, but rarely urgent:
- Hairline cracks under about 0.3 mm wide
- Random, map-like patterns on plaster or render
- Cracks that have not changed in width over several months
- No staining, dampness or loose material nearby
Signs that deserve an assessment
These suggest something is happening in the structure itself:
- Cracks that are widening, or that reopen after being filled
- Diagonal or stepped cracks near openings and supports
- Rust-coloured staining, which points to corroding steel
- Spalling, hollow-sounding areas or exposed reinforcement
- Doors and windows that start to stick
A crack is a symptom. Repairing the symptom without understanding the cause usually means repairing it twice.
What an assessment involves
We start by looking and listening: visual inspection, hammer tapping and crack mapping. Where needed, we add cover-meter readings, carbonation and chloride testing, or scanning to see the reinforcement.
The result is a short, plain-language report: what is happening, how serious it is, and the sensible options, from monitoring through to repair or strengthening.
KEY TAKEAWAYS
- Most hairline cracks are not structural, but they are worth recording.
- Width, movement, pattern and staining tell you more than the crack's length.
- Rust staining or spalling should always be assessed.
