Flashing A Roof Wall Intersection

Bigger step flashing is better.

Flashing a roof wall intersection.

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. There have always been problems with the flashing details at the roof to wall intersections of head walls rake walls and chimneys especially if brick or stone veneer or stucco is used. As a result most typical construction does not use any type of through the wall flashing which results in leaky wall complaints.

And in our experience when a single piece of flashing extends only a few inches under the shingles especially on a long roof slope and worse on a roof that happens to slope slightly towards rather than away from the abutting vertical building wall the accumulated roof drainage water near the bottom end of the roof wall intersection will overwhelm the width of the flashing and because it. Figure 79a flashing the junction step 1. Step 2 flashing 2 covers both the apron flashing upstand and the wall underlay. A headwall is a level junction where a roof meets a wall.

Flashing must be installed at wall and roof intersections and at built in gutters. Roof to wall intersections. Flashing is required at wall and roof intersections and to divert water away from where the eave of a sloped roof intersects a vertical sidewall. The current flashing details in the 2013 international residential code irc for sloped roof wall intersections are very difficult to construct.

Chapter 9 roof assemblies section r903 2. Roof leg and a 7 in. As a result most typical construction does not use any type of through the wall flashing which results in leaky wall complaints. Inspect the wall and roof framing to assess existing conditions and develop specific detailing for flashing the intersection of the wall and roof.

Self adhered flashing must comply with aama 711. Finally the housewrap can be laid up on the wall to cover the top of the kickout diverter and step flashings. The current flashing details in the 2013 international residential code irc for sloped roof wall intersections are very difficult to construct. Headwall flashing should extend up behind the exterior wall covering and down over the roof covering material as you see here.

Counter flashing let into the brick mortar joints sealed the top of roof wall flashing that you can t see. Where we provide more details about the right way to install flashing at the roof to wall intersection. 82 build supplement flashings section 4 roof wall intersections figure 79b step 2. The sketch shown here courtesy of steve bliss and j wiley sons is discussed in detail.

The narrower step flashing just isn t wide enough to protect the intersection fully.