Ell flashing is designed to bridge the roof to wall transition and allow for protection against water intrusion. Water which runs down the roof and wall is caught by the ell flashing and channeled to the roof’s edge. It is important that the ell flashing’s end be flared so it sticks out past the siding/stucco. On this Marcos Island roof the installers did not flare the flange end and it terminates behind the siding/stucco. This provides a direct path for water to flow behind the wall surface and into the building. Often this type of leak takes time to show and may only be noticeable in heavy rains and the wall needs to soak enough to be evident. The only correct way to repair this issue is to add a layer of membrane over the existing flashing that directs water flow out and away from the wall. Some roofers may suggest cutting out the old flashings and installing new. We do not suggest this, as it is impossible to replace the wall surfacing material and regain integrity.