Flashing Roof Against Vertical Wall

Apply the shingles up the roof until a course must be trimmed to fit at the base of the vertical wall.

Flashing roof against vertical wall.

The through the wall z bar flashing is sized to the thickness of the vertical blocking backing lumber. I fold a piece of metal flashing for the inside corner between the subfascia and the wall. Because most roof flashing is required to extend up the wall a minimum of 4 and some a minimum of 5. Roof flashing is a thin material usually galvanized steel that professional roofers use to direct water away from critical areas of the roof wherever the roof plane meets a vertical surface like a wall or a dormer.

I then add a second piece of flexible flashing tape to cover the open corner of the metal flashing and i fold it down onto the subfascia. Metal flashing also called roof flashing goes against a stucco wall to protect it from water damage. Likewise a 10 wide flashing will result in a 5 inch wide roof deck flange and a 5 inch vertical flange. A 5 inch wide flashing will result in a 2 1 2 roof deck flange and 2 1 2 vertical wall flange.

Flashing joints are lapped 6 in the direction of water flow. Tape the top of step flashing with 4 inch wide minimum self adhering modified bitumen roof tape. Flashing is installed to surround roof features such as vents chimneys and skylights. The flashing extends onto the roof a minimum of 2 inches 4 inches is preferable in more severe climate areas.

For areas where the walls meet the roof you will need to use the step flashing technique but you will need kickout flashing in other areas. Obviously the further up the wall a flashing extends the greater the resistance to water intrusion. The roof flashing is then placed up behind this through the wall z bar flashing on the outside of the vertical blocking backing material. Long helps it to fold onto the roof sheathing.

A sidewall is a junction between a wall and a sloped portion of a roof. Except where walls are brick the vertical part of the sidewall flashing should extend up behind the exterior wall covering just like with headwalls. By planning ahead you can adjust the exposure slightly and evenly in the previous courses so that the last shingle is at least 8 vertically wide. Most simply use a nominal 6 piece of lumber.

It is extended down the face of the vertical blocking backing lumber and over the l metal at head walls and the step flashing at rake walls a minimum of 3. The metal flashing is formed with a hook edge and cleated on 12 centers. A vertical cut about 2 in. The horizontal part of the flashing will vary depending on the type of roof covering material.

Flashing against vertical front walls to apply base flashing against a vertical front wall. At roof to wall intersections see figure 1. The flashing extends up the wall at least 4.