Learn how to install it below.
Roof to wall siding flashing.
Use step flashing that has a 2 to 4 inch longer vertical leg than normal.
Do not seal housewrap or building paper to step flashing.
Flexible flashing tape seals the eave to the wall.
However the typical recommended width of step flashing ranges from 5 inches to 10 inches.
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.
Most flashing is 8 inches wide.
I made this video this morning and i hope it help explain the flashing wall detail where the siding meets the roof.
The flashing needs to be installed before installing the roof shingles the metal flashing is formed with a hook edge and cleated on 12 centers the flashing extends up the wall at least 4 the flashing extends onto the roof a minimum of 2 inches 4 inches is preferable in more severe climate areas.
The solution to rotting sidewalls is a small piece of bent metal called a kickout flashing at roofing suppliers which simply directs all that water away from the wall.
For deck flashing.
Step flashing is a rectangular piece of flashing bent 90 degrees in the center.
Use the metal break tool to bend the flashing lengthwise in the middle according to the angle of the roof joint.
It is used for roof to wall flashing.
I cut the tape so that it laps onto the housewrap above and 3 in.
Once the flexible flashing is set i apply a piece of housewrap along the wall where the fascia meets it.
Likewise a 10 wide flashing will result in a 5 inch wide roof deck flange and a 5 inch vertical flange.
If your house has a roof line that extends past a corner of two walls make the first piece of step flashing a corner.
Install roofing felt before starting step flashing.
Install the kickout flashing.
4 inches should go up the house wall and 4 inches should go on top of the porch roof shingles.
Run roofing felt up the wall about an inch higher than the wall side.
The roofing contractors usually try to slide the roof flashing up behind lapped siding but many times this can be a chore and sometimes the exterior wall covering and or the existing water resistive barrier house wrap gets damaged in the process.
Above the roof sheathing.
A 5 inch wide flashing will result in a 2 1 2 roof deck flange and 2 1 2 vertical wall flange.
Kickout flashing installs just like standard step flashing except that half of the kickout flashing hangs over the edge of the roof.
