Type X Cavitrays are suitable for use in both traditional and timber frame construction where the course size is 75mm (standard brick work coursing) Internal / External Angles An angle is used instead of a catchment tray if the abutment ends or returns on a corner. An angle may also provide a link with horizontal trays if required. Long leads Long flashing for dressing directly over roof tiles. This option is appropriate where the tiles are suitably shaped (not flat or minimally undulated)