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Built in 1850 UK, the stair case seems to have wooden stud (balloon framed) walls built in to it which in turn supports floor joists of another room and large attach above. As you can see the load bearing walls do not span all the way across from wall to wall, but are centralised. How are these floor joists on the right of the pic supported by the wall, and in turn above!? The outer of the house is built of Brick which is Rat trap bond. Its all still standing strong touch wood! But no one knows how the internal wooden walls support all above and to the side of them.

Thanks...