Framing option for Boxed Bay Window

[Chriss]

I currently have a 5' wide opening/standard height opening on my second floor. It used to go out to a balcony which has now been removed. I want to remove the existing door, and install a window with a spot to sit on. I'm thinking 18" extending from existing wall. Standard box with no 'side' windows, just one one the same face as the existing wall.

As a framing alternative, I've had it suggested to me to form the base (and top) of the bay using two layers of plywood, formed basically in triangles, bolted into the existing 2x4 studs/jack studs, then framing in the rest with 2x4's.

If you understand what I'm describing, are there benefits/drawbacks of doing it this way vs.the 'normal' way in this thread: http://forums.jlconline.com/forums/s...-boxed-out-bay

[Slaughter Construction Co]

I'm not sure what you mean by triangles.
I've done it with 3/4 plywood rectangular panels fastened to the existing framing as you suggested with no problem. The existing header will carry the existing roof load. Then I furred out, as it were, on the outside of the plywood panels for insulation. That leaves more space for the seat. The new exterior wall will be supported be the plywood panels. Plenty strong.
How are you planning to handle the top/roof of the bay? Ir there an existing soffit/overhang that you can extend the bay up to it is a no brainer.
I didn't notice and didn't read your link before replying, so take this for what it's worth.

[Chriss]

That's basically what I'm saying, the rectangle is the same idea. Using a triangle shape would provide for an angled underside rather than squared off..however I like the idea of rectangle better. There is a existing overhang however it's on the rake side of the roof and 4 feet of so up from the top of the existing opening.

I'll try and get a picture today of the area in question