Flashing A Roof Wall Intersection

Where we provide more details about the right way to install flashing at the roof to wall intersection.

Flashing a roof wall intersection.

Roof to wall intersections. Counter flashing let into the brick mortar joints sealed the top of roof wall flashing that you can t see. 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. The current flashing details in the 2013 international residential code irc for sloped roof wall intersections are very difficult to construct.

Bigger step flashing is better. Self adhered flashing must comply with aama 711. Headwall flashing should extend up behind the exterior wall covering and down over the roof covering material as you see here. As a result most typical construction does not use any type of through the wall flashing which results in leaky wall complaints.

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. A headwall is a level junction where a roof meets a wall. This illustration shows proper flashing at a headwall condition.

Figure 79a flashing the junction step 1. Step 2 flashing 2 covers both the apron flashing upstand and the wall underlay. I recommend 12 in wide step flashings bent for a 5 in. At wall flashing details.

The sketch shown here courtesy of steve bliss and j wiley sons is discussed in detail. As a result most typical construction does not use any type of through the wall flashing which results in leaky wall complaints. 82 build supplement flashings section 4 roof wall intersections figure 79b step 2. The current flashing details in the 2013 international residential code irc for sloped roof wall intersections are very difficult to construct.

Flashing must be installed at wall and roof intersections and at built in gutters. The narrower step flashing just isn t wide enough to protect the intersection fully. 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. Inspect the wall and roof framing to assess existing conditions and develop specific detailing for flashing the intersection of the wall and roof.

Chapter 9 roof assemblies section r903 2.