new window and layers of old siding
I can do anything for structure I want. I tore all the existing out since the window is replacing a door that went full height in one section, and I found rot below all of it. For the header, I am putting in a 3 1/2 x 8" beam I cut from a standing dead hemlock. It will be supported by a pair of pressure treated 4x4s that will be sitting on the foundation. I was planning to use the 4x4s as the side structures. The bottom will just be built up how ever high I need to to make it all fit.
I don't think getting side flanges under the siding and behind the felt (if there is any) is a real option. this isn't flimsy vinyl siding, it thick asphalt shingles, boards and aluminum siding. and the window is real heavy to be trying any real gracefull moves with. I probably wont be able to get very far with flashing either with all the nails. I suppose I could run a sawzall behind the siding though, but there would be no real way to replace what I cut.