I have a double garage. Although the concrete walls and floor are in good condition the corrugated roof leaks in several places. My roofer has tried patching but eventually this stops working. I wonder if there is anything that can be done, possibly from inside, as a short term solution as the property may be redeveloped in five years or so.
I think anything inside is problematic as the water it collects would need to drain off somewhere. You do not mention whether the roof is metal or asbestos - if the latter great care is needed and minimum disturbance is essential.
No repair will be permanent but I suggest that wherever daylight is showing inside your roofer should patch outside with adhesive ‘flashband’ and then give the entire external surface a good coat of a reinforced acrylic plastic compound such as ‘Evercryl’ or ‘Flexacryl’ which contain synthetic fibers that help to seal small gaps and cracks.
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