Winds challenge traditional stepped running flashings, as rain drives under running flashing edges.
Once rain is just a few millimeters under the running flashing edge, it is in contact with the back of the flashing and the brickwork that is meant to be kept dry.
Approved Type X Cavitrays with integral flashings are different.
The flashing overlapping configuration arrests rain, blocking the gravitational and lateral permeation path (see dotted lines).
Cavity Trays Ltd of Yeovil manufactures proven performance trays for straight, concave and convex cavity walls.