Can anyone see any issues that I would have with the below roof design ?
The roof has 2 pitches - a standard 6 degree flat roof (single ply/PVC) but the 26 degree pitched gable element will have double romans. The single ply continues up the 26 pitch to ensure weathertightness and the double romans are on a cross battened frame over it down to the valley.
I don't want to elements to get under the tiles so I plan to rest the leading edge of the tiles (in the valley) on a continual standing seam, have eaves combs up at the first baton and then sloped final standing seam sections further up under the cross baton as a last defense
I am hoping this will be enough to protect the roof but wanted to check if there is anything I have overlooked