Supporting loft conversion landing - what would you do?

8 Mar 2020
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United Kingdom
Evening folk,

I was wondering if you helpful lot could give some suggestions on how to frame the new floor landing of a loft conversion.

Basically I'm having a double dormer loft conversion which is set over two levels. They are accessed by a dog leg staircase, the first flight of which reaches a half landing at level 1 (red) and the second flight of which reaches the main loft space at level 2 (blue).

I need to support both landings. The easy thing to do would be to attach a trimmer from point A to point B, which could support both the half landing, and have a post at mid span sitting on said trimmer that could support the level 2 landing (i.e. the bit in the green cloud). The problem is that the wall underneath point B is a flimsy 3x2 stud wall that sits on a single joist.

I am baffled at how to frame this. Is there any simple/common way to do this that I'm missing? I found a photo of a post supported landing online (attached) but I don't really want to use this if I can help it.

Cheers all

Screenshot 2020-04-30 at 19.40.27.png Screenshot 2020-04-23 at 18.35.46.png
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