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There is a part of the code that says what the air gap (shim space) all around the edges should be. In Michigan I think that's one part we have increased for energy reasons. Used to be 1/8" gap, then for decades 1/4" gap, now it's up to 3/8" (check your local codes). Most people fill the gap with non-expanding spray foam. There should be instructions on the windows too.
Flashing at window head not just lapping house wrap over nailing flange at top with tape.
Last edited by kach22i; 09-10-2005 at 06:26 AM..
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