I've had two flat roofs on my dormer totally stripped, re-boarded and covered with Cromar grp, its only been done a week and there's already standing water. There is a fall on both roof's but they have a dip near the edge, I've pulled the roofing company about it and there response was simply "its a flat roof what do you expect" surely this can't be right.

 

Any advice would be most welcome.

Thanks

Unfortunately 

It is quite normal 

GRP boats float for many years, so don't worry.

Not much consolation I'm sure but I have worse than this on a newly laid PVC roof:

Similar kind of response from the roofing contractor. He did acknowledge that there is a step up to the outlet and that significant work would be needed to rectify. I just wish it was pointed out to me before as I would have corrected it. I've put it down to experience.