Header flashing at wall above roof

[Mike Lamb]

Are there any written standards as to how big a header flashing should be at a wall to roof detail?

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[BADAIR]

refer to shingle mfr

R905.2.8.4 Other Flashing.

https://up.codes/viewer/int_residential ... hapter/9#9

[Jim Baird]

How big or how tall? I like the vertical distance to the window sill.

[Jim Katen]

Are there any written standards as to how big a header flashing should be at a wall to roof detail?

I think that the correct term is apron flashing or base flashing. Certainteed requires a minimum 2" vertical leg and a 3" or 4" horizontal leg, depending on the location.

[Steven Hockstein]

James Hardie requires a 2" gap but I rarely see it because it looks bad.

[Tom Raymond]

If it's done neatly, AND the flashing color matches either the roof or the siding it's barely even noticeable.