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This picture shows a typical wall flashing.
A Permadeck flashing is a separate L-shaped profile resin bonded into a diamond cut slot in the adjoining wall. Being virtually inert these flashings are far more effective and durable than the old lead type.
Tile and slate flashings can be fitted without disturbance by using a 'tile trim' which slides up to the first row of nails or the first tile batten.