Flashing joints are lapped 6 in the direction of water flow.
Flashing roof to wall intersections.
Proper installation of flashing and counter flashing at the intersection of a vertical wall with a roof surface is required to avoid roof leaks.
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.
Step 1 flashing 1 is a typical apron roof flashing.
Above the roof sheathing.
The metal flashing is formed with a hook edge and cleated on 12 centers.
Tape the top of step flashing with 4 inch wide minimum self adhering modified bitumen roof tape.
Most mason contractors are diligently installing flashing and weep holes at the base of walls as well as at the window head and sill.
I cut the tape so that it laps onto the housewrap above and 3 in.
The flashing upstand is carried up under the cladding and wall underlay and the ridge flashing roofing flashing junction ridge flashing barge flashing stop end required to end of apron flashing 4 2 82 build supplement flashingssection 4 roof wall intersections.
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.
Use step flashing that has a 2 to 4 inch longer vertical leg than normal.
Flexible flashing tape seals the eave to the wall.
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.
If the roof is metal or rubber membrane continuous flashing should be used rather than pieces of step flashing.
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.
Roof shingles should be installed over the portion of step flashing on the roof.
Do not seal housewrap or building paper to step flashing.
