The dry verge system is a roofing method that involves caps or verges that interlock, clipping over the edge of the roof tiles, protecting the tiles, keeping them secured and preventing water and pests from entering the roof space..
A properly fixed uPVC dry verge will be maintenance free. Caps are available that allow cross ventialtion in the roof space where this is deemed appropriate. This is another way to prevent build up of damaging structural moiture.
Verge tiles are intended to help secure the main roof tiles - especially in exposed locations.