The flashing extends onto the roof a minimum of 2 inches 4 inches is preferable in more severe climate areas.
Flashing roof to wall intersections.
If the roof is metal or rubber membrane continuous flashing should be used rather than pieces of step 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.
I use a wide piece of flexible flashing tape to protect the area between the subfascia and the wall.
Once the flexible flashing is set i apply a piece of housewrap along the wall where the fascia meets it.
Flashing joints are lapped 6 in the direction of water flow.
Install step and kick out flashing at all roof wall intersections to protect walls from water intrusion and install boot or collar flashing at all roof penetrations to protect roofs from leaks.
I cut the tape so that it laps onto the housewrap above and 3 in.
Step and kickout flashing should be installed at all roof wall intersections to protect the wall and divert rainwater runoff into a gutter.
If there is no metal flashing installed at the wall roof intersection or if the existing flashing is damaged improperly installed or allowing water to damage the wall remove the siding and any existing flashing to expose at least 8 inches of the wall.
Above the roof sheathing.
Proper installation of flashing and counter flashing at the intersection of a vertical wall with a roof surface is required to avoid roof leaks.
Flexible flashing tape seals the eave to the wall.
Kick out flashing should be installed at the end of a roof wall intersection to divert water away from the wall and into gutters.
Thru wall flashing originates with a vertical leg in contact with the exterior sheathing tucked or shingled up under the house wrap and a horizontal leg that extends all the way through the masonry to the exterior surface of the wall.
At roof to wall intersections see figure 1.
Tape the top of step flashing with 4 inch wide minimum self adhering modified bitumen roof tape.
The flashing extends up the wall at least 4.
The metal flashing is formed with a hook edge and cleated on 12 centers.
Repair any damaged sheathing and framing.
