Flashing Roof Against Vertical Wall

Flashing is installed to surround roof features such as vents chimneys and skylights.

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. Long helps it to fold onto the roof sheathing. Tape the top of step flashing with 4 inch wide minimum self adhering modified bitumen roof tape. At roof to wall intersections see figure 1.

A vertical cut about 2 in. The horizontal part of the flashing will vary depending on the type of roof covering material. Except where walls are brick the vertical part of the sidewall flashing should extend up behind the exterior wall covering just like with headwalls. I fold a piece of metal flashing for the inside corner between the subfascia and the wall.

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. 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. The flashing extends up the wall at least 4. The roof flashing is then placed up behind this through the wall z bar flashing on the outside of the vertical blocking backing material.

Flashing joints are lapped 6 in the direction of water flow. Use flashing cement at joints to help secure flashing. Metal flashing also called roof flashing goes against a stucco wall to protect it from water damage. 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 flashing extends onto the roof a minimum of 2 inches 4 inches is preferable in more severe climate areas. Obviously the further up the wall a flashing extends the greater the resistance to water intrusion. A sidewall is a junction between a wall and a sloped portion of a roof. Flashing against vertical front walls to apply base flashing against a vertical front wall.

The through the wall z bar flashing is sized to the thickness of the vertical blocking backing lumber. 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. 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.

Most simply use a nominal 6 piece of lumber. Use step flashing that has a 2 to 4 inch longer vertical leg than normal. The metal flashing is formed with a hook edge and cleated on 12 centers.