Mike Lamb 59 Posted February 18, 2017 Report Share Posted February 18, 2017 Are there any written standards as to how big a header flashing should be at a wall to roof detail? Click to Enlarge 52.83 KB Quote Link to post Share on other sites
BADAIR 14 Posted February 18, 2017 Report Share Posted February 18, 2017 refer to shingle mfr R905.2.8.4 Other Flashing. https://up.codes/viewer/int_residential ... hapter/9#9 Quote Link to post Share on other sites
Jim Baird 36 Posted February 19, 2017 Report Share Posted February 19, 2017 How big or how tall? I like the vertical distance to the window sill. Quote Link to post Share on other sites
Jim Katen 138 Posted February 19, 2017 Report Share Posted February 19, 2017 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. Quote Link to post Share on other sites
Steven Hockstein 9 Posted February 20, 2017 Report Share Posted February 20, 2017 James Hardie requires a 2" gap but I rarely see it because it looks bad. Quote Link to post Share on other sites
Tom Raymond 27 Posted February 21, 2017 Report Share Posted February 21, 2017 If it's done neatly, AND the flashing color matches either the roof or the siding it's barely even noticeable. Quote Link to post Share on other sites
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