I'm currently building an 8' x 13.5' shed with a loft. Here is what it is supposed to look like (according to the plan):
For a few reasons, the floor frame is too wide. I poured the piers slightly wide, and I couldn't find post-to-beam connectors for 6" posts to double 2x, so I used 6" to triple 2x.
I have already installed joists and blocking as shown in the picture above.
The 13.5'-long beams are each composed of three built-up 2xs. The distance between the outer edges of the innermost 2xs is 8':
I assumed I'd be fine to build my 8'-wide shed on that red space and have a two-2x "lip" running along the sides of the shed. My next step would therefore be to screw 4x8 plywood subfloor so that it covered the innermost 2xs only.
However I'm wondering if this is safe. As I build up, will the load still be distributed laterally across the beam?
I'm hesitant to build to the full width because my materials were ordered with the 8' dimension in mind. I think building to the outer edge of the second 2x on both sides (total width 8'3") would be as far as I could go without pieces coming up short.
I don't need a building permit for something of this size, so I'm not worried about an inspection, just about structural integrity.