fibre glass flat roof cracking

[Marble4621]

Hi everybody, an help would be helpful , I’ve had my flat roof replaced twice now and reboarded but after 18 months it’s started showing cracks and splits already , any ideas why this could be happening ? Im at my wits end with it Thankyou

 

[Rufus Raintight]

I know you said fibreglass roofing in the title but is this the standard GRP roofing or something else (do you have a product name?), and is this a white or light grey finish it's hard to tell with the light, reason I ask is you don't see a lot of white GRP roofs kicking around.

If it's a standard GRP fibreglass roof the topcoat could have been applied too thick (which would explain why you don't see any fibre print through in the pictures) or the system/roof hasn't been correctly installed to cope with the thermal expansion and contraction, what's the size of the roof? Did they board over the existing surface or lay the system on fresh decking?