Don't Caulk Above Openings
Leaving the siding joint over head flashing uncaulked — it's the drainage exit for water that gets behind the siding.
Fold the bottom corner of the first step flashing down with needle-nose pliers and flatten the fold with a hand seamer: a one-piece kick-out that sends sidewall runoff into the gutter with no cut for water to find.
rain diverter, water dumping behind the gutter, streaks on siding below the roofline
Where a roof edge dies into a sidewall — a gable end running into a wall, for example — water coming down the step flashing has to go somewhere when the roof stops. If the first piece of step flashing runs flush with the roof edge, that water rides off the end and down the face of the siding below. On wood siding that means staining and, over time, rot.
A kick-out flashing at the bottom of the run catches that water and diverts it into the gutter. The usual way to make one is to cut a step flashing and bend a tab — but the cut leaves a hole or an overlapped seam at exactly the spot where all the water concentrates.
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