|Making of Roof Flashing - Course: Timberwork techniques. Trainees' handbook of lessons (Institut für Berufliche Entwicklung, 15 p.)|
Roof flashings are necessary to protect the top border of the outside walls of buildings from penetrating rain water. In the course of time, penetrated rain water would destroy the upper layers of the containing walls of buildings and render the building unusable.
If the upper layers of containing walls of buildings are soaked with moisture, this may result in efflorescence and dry rot in the brickwork.
Removal of such damage to the building is very expensive in terms of time and money. In addition to the beginning destruction of the brickwork or framework wall, moisture would penetrate into room walls. Room walls thoroughly moistened would annoy the user of the room by bad smells and damage furniture and textiles in the room. Moreover, permanent stay in such rooms with moistened walls is detrimental to the health of the room user.
But roof flashings are also important for the architectural design of the roof structure or required to make the form of the roof match the surrounding roofs.