Hi I am trying to put in a new staircase, however the floor joists above run across the new opening. There is only one stud wall on them and this too runs across them, but not in The way of the new opening. My question is how do I keep the strength in the floor because when I cut the opening the joists will no longer be resting on a brick wall at that end.? The new stairs are to run up beside one of the Walls which the joists sit on cheers