Architecture in the Northeast doesn’t understand horizontal rain like we do in the South. Snow loads? You bet. but driven rain, sideways, for 3 hours? Nope. It’s gonna seep around window seals and door jambs, etc.
What is done architecturally in the south to manage driving rain?
Can’t describe the specifics very well, but say you go to Ft Lauderdale and stay in a newer hotel of condo. Take a look at hos the windows are channeled and how they are flashed/ fit in the building etc. They are truly design to keep a high pressure spray of water out.
I grew up in upstate NY and now live in the South, and travel to the gulf Coast a lot.
When you compare commercial and residential windows, doors, eaves etc., you can see it’s different.
Not an architect here.