FAILURES: IS THE DIVERTER IN THE DETAILS?

Below the roof ’s termination within the wall is a common location for water damage to sheathing and framing in low-rise wood frame construction with sloping, shingle roofs. Studies of water-damaged homes reported by Moisture Free Warranty show these areas account for only about 22 percent of moisture readings, but cause 50 percent of the damage behind the cladding. This is frequently due to the lack of diverter (i.e. kickout) flashing at the end of the roof.

METAL ROOFING MAGAZINE'S TOP TEN PRODUCTS OF 2005

...A molded kick-out diverter, DryFlekt is a water management strategy for sloped roofs that meet vertical walls. Dryflekt's patented design creates a down and outward water flow away from walls and helps prevent water intrusion at roof to wall intersections. It’s constructed of durable polypropylene copolymers with UV and heat stabilizers.

PROFESSIONAL ROOFING - ROOFING ESSENTIALS SEPTEMBER 2001
Flashing at Intersections

To prevent roof system leaks, a common building configuration that requires special attention is the point where asphalt shingles intersect a continuous side wall....

...NRCA suggests a diverter be installed as the bottom step flashing.

PROFESSIONAL ROOFING - MANUAL ELEMENTS MAY 2005
Step Flashings

The point where step flashings start and intersect a wall covering can be difficult to weatherproof. In these instances, NRCA suggests the use of a soldered one-piece step flashing at the eave-to-wall interface. The suggested one-piece step flashing is fabricated with a kickout at the downslope edge. ...The kickout portion of the step flashing will direct this water onto the roof surface, preventing it from going behind the wall covering.

Other compatible materials with appropriate expected service lives, such as polypropylene co-polymers, may be used.