There are, many types of roof flashings but the type I see improperly installed more than any other kind is the flashing between a roof and brick. This type of flashing runs along the roof and is then tucked into the brick. The problem is a lot of roofers will use just a piece of base flashing. After a few years and with the movement of the house it begins to have stress on the flashing and pulls it out of the mortar joint. The home owner starts using caulk but it will never be right. The proper way to flash this area is with two pieces of flashing (the base flashing) but a secondary flashing that then tucks into the mortar joint. As the house moves the flashing moves with it preventing any problems. Just proves how important quality contractors can be for your home.