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With regard to detailing wall systems, I have a little something I call Ostrander's Law - "If you don't show it, you don't get it!" All through wall flashing above and below openings must have an
end dam to prevent water from migrating laterally. What happens when you don't show them on your drawings? You don't get them! The preformed end dams shown to the left make the task simple.
From Piper & Kenney (1993):
"Flashing that is not dammed at the ends or otherwise sealed, permits water to move laterally in the wall. Flashing details are almost always drawn as vertical sections, with little thought given
to how the ends of the flashing are terminated.
Flashing that is otherwise well installed is often ineffective because water can flow off the ends and into abutting construction."
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