'Flat' fibreglass roof holding water

Just a quick one – our kitchen and bathroom extension has a flat roof which is holding water in a pool. Obviously the fall isn’t sufficient to clear it, and any water seems to be making the ‘pool’ a bit bigger over time (ie since we moved in 4 years ago). Im getting the ceiling underneath the pool repaired / replaced in a week or so – is there any way l can push the fibreglass up safely to get rid of the pooling? Or would the roof be strong enough just to leave it alone?

As a note, the roof isn’t leaking – the ceiling is getting replaced because it’s cracked from thermal expansion / contraction.

Ta!

anyone?

You would not be able to push the fibreglass up as its laid over a wooden base.
It could be the wood has rotted, or more likely, the roof was incorrectly laid initially.
If the fibreglass is not leaking at the moment, it may stay like that for years.
You might like to look at the condition the wood decking when the internal ceiling s removed, if its rotten, it’s time to replace the roof