The big window...

There were two areas of our house that were in particularly bad shape.  One was below the front living room window, and the other (which started this whole reno) was below the huge window in the family room at the back our our house.  The family room window was one giant ~12' x ~15' window.  The engineer and contractor that we spoke to said that large windows like this often cause problems, and recommended breaking it into several smaller windows with bits of wall framed in between them.

Here's the before and after on the inside:

And before and after on the outside: