How do you know if you have a spalling problem?

If you look up and see concrete on your ceiling which is cracking, pieces may be falling off revealing rusted steel underneath…
YOU HAVE A SPALLING PROBLEM

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What you should know about your concrete roofs and slabs

If you have a concrete ceiling and you happen to look up, you may see cracks appearing on the underside of the concrete with the possibility that the concrete looks as if chunks of it may fall off.
This usually comes hand in hand with a brown discolouration, and possibly some white powder forming.
This degradation is called spalling.