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Surely the architect/architectural technician has drawn a plan and section to show what should be laid over the fibreglass.
At the very least I would expect to see sand blinding to prevent damage to the fibreglass, before anything else is laid above it, but drainage is also an issue and would be required to stop the sand blinding washing out.
Andy
I would never spec this myself as the liability for any future leaks will fall firmly at your door.
Ask for the architect and structural engineers specifications. There may also be issues with weight loading as well as potential leaks. This would also be prevalent if using leg supports.
The gel coat on grp makes it almost impossible to bonds to, but that shouldnt be an issue
Good luck
Tim
Agree with other posters that you should refer back to the architect or engineer for specification to cover your asp
I would have thought Porcelain tiles/slabs would be more suitable due to weight loading as opposed to slate or granite and adjustable pedestal legs would be used
I had a friend/fellow landscaper that did one a couple of years ago on a roof and he got into some hot water with it due to a leak dispute