Does anyone have experience with removal of these old wood windows. It appears that they are nailed in via a wooden flange that is about 3-4" wide. That flange is nailed directly to the studs. But there is no sheathing underneath this flange, the wood flange acts as the sheathing I guess. Hope this makes sense to someone. Does anyone have any ideas on how to proceed with removal and installation of new window. Once old window is removed there won't be any sheathing for the new window fin to attach to.

 

So we can see what you see, please post a couple of pictures. Difficult to advise in the dark. http://www.doityourself.com/forum/el...your-post.html

 

Far more likely the old windows where attached to the studs with no nailing fins if there that old.
There was never any "sheathing" in the old days.
To get them out you need to remove the inside casing and outside trim. run a sawsall blade down the side of the window frame to cut off the nails.

 

Window is actually not nailed through the jambs to the jack studs. There are weight pockets on either side prohibiting that. Behind the exterior trim are the wood nailing flanges. Has anyone done a full replacement on these types of old windows before? Here are a couple pics inside and out

 

Does anyone have any advice on removal and install
On these types of windows. Is it the norm to have to add plywood sheathing to the perimeter of the window as it wasn't there before

 

This is a picture of the left side of my 3-wide double hung unit with exterior trim removed. There is a storm window attached to the frame of my double hung. You can see this wooden frame that is nailed to the exterior sides of the studs. When the windows removed the frame will come with it and leave a void. Anyone have any advice on the best way to go about this?

 

Standard procedure varied/varies in different geographical areas.

In your case, the sheathing and the "sub casing" are in the same plane. The stucco finish is applied to lath nailed onto the sheathing. The finish casing is applied over the sub casing. To get back to the face of a stud you would more than likely have to deal with removing some stucco, probably not something you want to do.

If you can leave the sub casing in place and add a stud to create the opening size you want for your window and then use the sub casing or a portion of it as the sheathing plane for your nailing fin on the new window...., this would be the best approach. Flashing everything well is where the problem will arise. You could then install a new finish casing over the flange and sub casing. That piece could be made of wood or a synthetic material not subject to decay.

 

The "subcasing" that you're referring to is actually attached/integrated with the 3-wide double hung unit. This subcasing frames the entire 3-wide double hung and serves as the wood flange that holds the window in place. When I remove the window the "subcasing" will come with it. So I don't know how I could keep it??

 

Sawzall or circ. saw cut it along the edge of the back of the jamb.

I believe you want to save as much of it as possible so you can attach a jack stud behind it and use the face of it as the sheathing plane to attach the fin of the new unit to.

 

But there already is a jack stud behind it? Thats what the current windows are nailed to.

 

If there is a weight pocket to the left and right sides of the unit, the subcasing has to be spanning that pocket before it hits the jack stud you have.

If you want to keep the piece to use as sheathing then cut it off at the back edge of the jamb or pull the nails that hold it to the jamb. Yo can then install another jack to take the place of the weight pocket and nail your new unit to that jack with the old sub casing acting as sheathing.

I have seen many applications with old window units and unless you have something really unique then I suspect what I am telling you will work. Perhaps post a better picture of the interior where you took off the side casing.