Fibreglass is highly resistant to dents and the usual wear and tear on a roof. It does not weaken when exposed to water or weather.
A word of warning though…. It must be installed correctly, following the correct processes and using the correct materials and by a qualified installer as when fibreglass fails it does so with huge repercussions.
We remove on average 2 fibreglass roofs installed by other contractors per month which have failed within the first year!