Make New Windows Weathertight
Use peel-and-stick membrane to bridge the corner gap on new windows.
When windows come from the manufacturer with the flanges folded down, how do you handle the open corners? Mike Guertin has a suggestion for using peel-and-stick membrane to solve the problem.
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On the Left Coast, I'm used to seeing welded vinyl corner flanges, so we don't have this issue. There's usually a 1x2 screwed to the bottom flange to protect it in shipping.