A 5 inch wide flashing will result in a 2 1 2 roof deck flange and 2 1 2 vertical wall flange.
Flashing roof against 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.
The horizontal part of the flashing will vary depending on the type of roof covering material.
Obviously the further up the wall a flashing extends the greater the resistance to water intrusion.
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.
Use flashing cement at joints to help secure flashing.
The through the wall z bar flashing is sized to the thickness of the vertical blocking backing lumber.
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.
Use step flashing that has a 2 to 4 inch longer vertical leg than normal.
At roof to wall intersections see figure 1.
A sidewall is a junction between a wall and a sloped portion of a roof.
Likewise a 10 wide flashing will result in a 5 inch wide roof deck flange and a 5 inch vertical flange.
Except where walls are brick the vertical part of the sidewall flashing should extend up behind the exterior wall covering just like with headwalls.
Flashing joints are lapped 6 in the direction of water flow.
A roof or wall that is not properly sealed off from water can be extremely costly to fix not to mention the hassles that accompany the unwanted water.
The metal flashing is formed with a hook edge and cleated on 12 centers.
Flashing against vertical front walls to apply base flashing against a vertical front wall.
The flashing extends onto the roof a minimum of 2 inches 4 inches is preferable in more severe climate areas.
The roof flashing is then placed up behind this through the wall z bar flashing on the outside of the vertical blocking backing material.
Because most roof flashing is required to extend up the wall a minimum of 4 and some a minimum of 5.
I fold a piece of metal flashing for the inside corner between the subfascia and the wall.
A vertical cut about 2 in.
The flashing extends up the wall at least 4.
Apply the shingles up the roof until a course must be trimmed to fit at the base of the vertical wall.
Most simply use a nominal 6 piece of 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.
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.
