Roof shingles should be installed over the portion of step flashing on the roof.
Flashing roof to wall intersections.
The flashing extends onto the roof a minimum of 2 inches 4 inches is preferable in more severe climate areas.
I use a wide piece of flexible flashing tape to protect the area between the subfascia and the wall.
Step and kickout flashing should be installed at all roof wall intersections to protect the wall and divert rainwater runoff into a gutter.
Above the roof sheathing.
Flexible flashing tape seals the eave to the wall.
Tape the top of step flashing with 4 inch wide minimum self adhering modified bitumen roof tape.
Flashing joints are lapped 6 in the direction of water flow.
Our page top photograph illustrates a successful installation of flashing and counter flashing along intersection of a roof surface with the side of a brick constructed dormer.
At roof to wall intersections see figure 1.
Proper installation of flashing and counter flashing at the intersection of a vertical wall with a roof surface is required to avoid roof leaks.
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.
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.
The flashing extends up the wall at least 4.
Kick out flashing should be installed at the end of a roof wall intersection to divert water away from the wall and into gutters.
Once the flexible flashing is set i apply a piece of housewrap along the wall where the fascia meets it.
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.
Do not seal housewrap or building paper to step flashing.
I cut the tape so that it laps onto the housewrap above and 3 in.
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.
