Flashing Roof To Wall Intersections

Use step ﬂashing that has a 2 to 4 inch longer vertical leg than normal. Proper installation of flashing and counter flashing at the intersection of a vertical wall with a roof surface is required to avoid roof leaks. Kick out flashing should be installed at the end of a roof wall intersection to divert water away from the wall and into gutters.

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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.

Flashing roof to wall intersections.

The metal flashing is formed with a hook edge and cleated on 12 centers. I use a wide piece of flexible flashing tape to protect the area between the subfascia and the wall. If the roof is metal or rubber membrane continuous flashing should be used rather than pieces of step flashing. At roof to wall intersections see figure 1.

Above the roof sheathing. Step and kickout flashing should be installed at all roof wall intersections to protect the wall and divert rainwater runoff into a gutter. Roof shingles should be installed over the portion of step flashing on the roof. 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. 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. Most mason contractors are diligently installing flashing and weep holes at the base of walls as well as at the window head and sill. Flexible flashing tape seals the eave to the wall.

Flashing joints are lapped 6 in the direction of water flow. 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. Tape the top of step ﬂashing with 4 inch wide minimum self adhering modiﬁed bitumen roof tape. Once the flexible flashing is set i apply a piece of housewrap along the wall where the fascia meets it.

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. Repair any damaged sheathing and framing. I cut the tape so that it laps onto the housewrap above and 3 in. Do not seal housewrap or building paper to step ﬂashing.