Sealing new windows

http://cdn.brownstoner.com/506875c3259cc-.jpg

I just replaced three windows in the bay in the back of my brownstone. The bay itself, constructed in wood all those years ago, was sheathed in plywood and stuccoed (not particularly well) by a previous owner. The window installers made the framing only wide enough to seat the new windows–they did not extend the vertical surface all the way out through the envelope of the house. It’s not clear to me whether they should have done this or not, but the waterproofer I have redoing the stucco on the outside of the bay says that he can’t attach his rigid foam to the window openings.    What I’ve got in the window opening is a sandwich of original interior molding; original plaster; ancient wood framing; plywood; mortar; wire lath; more mortar; and the new waterproofing, with rigid foam and (eventually) stucco coating. The window installers put some 1 x 6 framing around the sides of the rough opening, but as I said, it doesn’t extend beyond the outside edge of the windows themselves. On the outside of the window, there’s no smooth vertical surface, only the side edges of the layers of ply and mortar, with significant gaps in places. There’s nothing to attach a vertical surface to. (photo attached)   The waterproofer wants me to get the window guys to come back, take the windows out, and reinstall them with a frame that goes all the way to the outside, so that he can use the rigid foam. That’s simply not going to happen. Unfortunately, I already paid the window company, so I have no chance of getting them back to redo a job that they think they did perfectly well to begin with. The waterproofer doesn’t seem to have any methods in his repertoire other than foam and stucco, but there must be a way to fill this sandwich in with some kind of mortar or epoxy that would take the stucco.    Any suggestions of materials or techniques?

im owner of brownstoner in cobble hills i have renovated everything by myself with help of my coworkers i didnt do any brownstone repair nothing outside the house becouse i had spent alot of money for interior renovation but im planning for next year to hire somebody to rebrownstone the front of my house becouse its cracked and dirty on the back wall im thinking of instaling eifs stucco same as your waterproofer install its the best stucco system becouse it insulate your house and looks great but must be profesionally instaled what i see on your picture there no way to install the eps foam pic (its not ridgid foam) becouse there no way to screw it or no way to use adhesive the spaces between plywood and windows are open and should be covered with plywood or some diffrent wood i dont see any framing there to install plywood i think the best way to do it is to install wide framing to cover it and it should be done before windows are installed its very inportand becouse around windows leaking is always possible if it isnt waterproffed correctly if you have already paid the window istallers and they dont wanna comeback to do it right you should hire some carpenter to remove these windows and build in new framing in opening and install windows again its easy to do if somebody have some experience you should seek for some carpenter he should be done in 1 day and would charge a honest fee.

I’ve seen this situation more than once.I’m curious as to how the window installers explained using a 1×6 in this occasion.The window company  discussed the fact PRIOR that they were not going to finish your windows along these lines ? How do you intend to get your exterior finished?  Has the plasterer said he is going to return the plaster into our jamb after we place the windows into the openings and leave? Does he know whats involved here, Is he aware we are installing a 1×6 jamb. I guess there was no communication of anything , just grab the check and run.  I’m a carpenter ,Call me and we can discuss further if u like -maybe i can help.   917 886 9576 – john.