What is roof flashing and why is it used?
A. Flashing, usually metal, is a bridge between dissimilar building materials. It is usually found at the drip edge of a roof, around a chimney or between the roof cover and a wall. Flashing is used because of its flexibility and it can be shaped to fit most corners and angles. Areas that are flashed usually have a lot of moisture and wear and tear. Metal flashing wears well and takes a lot of abuse.