Flashing Roof To Wall Intersections

At roof to wall intersections see figure 1.

Flashing roof to wall intersections.

Step 1 flashing 1 is a typical apron roof flashing. I use a wide piece of flexible flashing tape to protect the area between the subfascia and the wall. The flashing extends onto the roof a minimum of 2 inches 4 inches is preferable in more severe climate areas. 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.

I cut the tape so that it laps onto the housewrap above and 3 in. If the roof is metal or rubber membrane continuous flashing should be used rather than pieces of step flashing. Proper installation of flashing and counter flashing at the intersection of a vertical wall with a roof surface is required to avoid roof leaks. 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.

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. Above the roof sheathing. Once the flexible flashing is set i apply a piece of housewrap along the wall where the fascia meets it. Use step flashing that has a 2 to 4 inch longer vertical leg than normal.

Most mason contractors are diligently installing flashing and weep holes at the base of walls as well as at the window head and sill. The flashing extends up the wall at least 4. 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. Do not seal housewrap or building paper to step flashing.

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. The metal flashing is formed with a hook edge and cleated on 12 centers. Flashing joints are lapped 6 in the direction of water flow.