2nd Story Porch Connection?
Thanks for trying to understand the problem. It's taken me several days to think it over. Part of the joy of an old house if finding out what is behind the walls and ceilings!
The first picture is the outside. You can see the second story screened porch that was built on top. Yes, it overhangs by about 18" in all directions! Believe it or not they had a hot tub up there! The top frame is 2x6's all the way, but I think there's 1x10 or 2x10 behind that on the exterior. I can't see that part. The upper porch has 3/4" plywood for the floor.
The second picture is a view of the ceiling of the first floor. At the bottom left, you'll see the bottom 2x6. The add on porch joists were just put perpendicular to the joists below it.
As far as I can tell, the base of the second story porch is not attached to the house with anything more than 5-10 nails and gravity. Again, it's had a hot tub up there, so maybe I'm over thinking it - but this just doesn't seem safe.
As I mentioned previously, my approach is to take a 2x12 and notch out where the upper joists go. Then I'll attach it to the upper and bottom 2x6 and attach it to the house with 10" screws (RSS). There is something to screw into the bottom 2x6, but not the upper. Then I could add joist hangers to the upper joists and have some support to prevent the upper frame from sliding.
I'm here for ideas though and would welcome any.