Flashing Roof To Wall Intersections

I use a wide piece of flexible flashing tape to protect the area between the subfascia and the wall. I cut the tape so that it laps onto the housewrap above and 3 in. Flexible flashing tape seals the eave to the wall.

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Above the roof sheathing.

Flashing roof to wall intersections.

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. Repair any damaged sheathing and framing. Step and kickout flashing should be installed at all roof wall intersections to protect the wall and divert rainwater runoff into a gutter.

Proper installation of flashing and counter flashing at the intersection of a vertical wall with a roof surface is required to avoid roof 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. 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. Most mason contractors are diligently installing flashing and weep holes at the base of walls as well as at the window head and sill.

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. 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. Flashing joints are lapped 6 in the direction of water flow. Kick out flashing should be installed at the end of a roof wall intersection to divert water away from the wall and into gutters.

Do not seal housewrap or building paper to step ﬂashing. If the roof is metal or rubber membrane continuous flashing should be used rather than pieces of step flashing. Roof shingles should be installed over the portion of step flashing on the roof. The metal flashing is formed with a hook edge and cleated on 12 centers.

Use step ﬂashing that has a 2 to 4 inch longer vertical leg than normal. 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. At roof to wall intersections see figure 1.