How to fix a corrugated iron flat roof before Winter

if you have an corrugated iron flat roof, this might be just what you need.

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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.